Wastewater treatment – Provider of innovative and cost-effective wastewater treatment solutions

WASTEWATER TREATMENT FOR ALUMINUM PACKAGING PRODUCTION

devsite — Thu, 03 Apr 2025 04:59:55 +0000

In recent years, Vietnam’s beverage industry has contributed more than 10% to the national GDP, maintaining an impressive growth rate. The average annual growth of this segment is expected to reach 6.28% from 2023 to 2028.

As the demand for beverages increases, the supply chain for aluminum packaging (aluminum cans) has also expanded. Aluminum cans, in particular, have the advantage of being more recyclable than other packaging materials, aligning with businesses’ efforts toward sustainable packaging.

1. Aluminum Can Production Process

2. Challenges in Treating Aluminum Can Production Wastewater

a. Characteristics of Wastewater

The composition and characteristics of aluminum can production wastewater primarily include heavy metals, mineral oils, and organic compounds.

Heavy metals such as aluminum, chromium, nickel, and cadmium may appear in wastewater from plating, anodizing, and protective coating processes.
High COD and BOD levels: Organic compounds from paints, inks, and surface treatment chemicals contribute to high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) levels in aluminum can production wastewater.
High suspended solids (TSS): Suspended solids often include aluminum dust, aluminum scraps, and residual contaminants from cutting, stamping, and machining processes.

Parameter	Unit	Concentration Range	Source
Heavy Metals
Aluminum (Al³⁺)	mg/l	150-300	Cleaning, anodizing, protective plating
Crom (Cr⁶⁺, Cr³⁺)	mg/l	0,1 – 5	Anodizing, corrosion resistance
Niken (Ni²⁺)	mg/l	0,1 – 3	Protective plating, aluminum alloys
Zinc (Zn²⁺)	mg/l	0,2 – 10	Coating, corrosion resistance
pH	–	3 – 12	Acidic or alkaline cleaning
Solids
Total Suspended Solids (TSS)	mg/l	200 – 500	Sludge, metal residues
Organic Compounds & Oils
Chemical Oxygen Demand (COD)	mg/l	200 – 1000	Cleaning chemicals, oil emulsions
Mineral Oils	mg/l	10 – 400	Lubricants, surface protectants
Other Compounds
Amoni (NH₄⁺-N)	mg/l	5 – 50	Additive chemicals
Sunfat (SO₄²⁻)	mg/l	200 – 2000	Sulfuric acid use in anodizing

Note: The concentration ranges in the table are for reference only. Actual values may vary depending on production technology and pollution control measures at each factory.

3. Wastewater Treatment Solutions by NGO International

a. Compact Treatment System with Small Footprint

NGO International designs systems that effectively separate and pre-treat highly polluted wastewater streams, reducing the overall pollution load. This approach optimizes reaction tank volumes and minimizes construction space.

b. Cost-Optimized Investment

With extensive expertise in wastewater characteristics and contaminants, NGO International optimizes designs using 100% locally manufactured equipment in Vietnam, reducing investment costs.

c. Wastewater Recycling & Reuse

Currently, treated wastewater meets QCVN 40:2025/BTNMT standards and is discharged into the environment. However, as environmental concerns grow and clean water becomes scarcer, simply meeting discharge standards is no longer the most economical or effective solution for modern industries. In line with sustainable development trends, wastewater reuse is becoming a strategic approach.

Instead of wasting valuable resources, treated wastewater can be recycled for production, aiming toward a zero-discharge factory model.

Businesses interested in wastewater treatment solutions for aluminum can production can contact NGO International at +84 24 7300 0890 or email office@8ngo.com for direct consultation.

See more at:

https://ngoenvironment.com/en/wastewater-treatment-tec29-physical-and-chemical-wastewater-treatment-methods-d55.html

https://shopngoenvironment.com/en/product-category/industrial-products/flotation-equipment/

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This website is copyrighted by NGO International Co., Ltd. Any use or reproduction of part or all of the content in any form is strictly prohibited, except with explicit written permission from us.

WASTEWATER FROM ROASTED COFFEE PRODUCTION: EFFICIENT TREATMENT & REUSE SOLUTIONS

devsite — Thu, 19 Dec 2024 08:13:53 +0000

WASTEWATER TREATMENT SOLUTIONS FOR COFFEE PRODUCTION

Vietnam’s coffee industry is facing a dual opportunity and challenge. The opportunity comes from a global market that increasingly favors high-quality products with sustainability certifications. The challenge arises from the production process itself—a process that consumes a vast amount of water and generates one of the most “difficult-to-treat” types of wastewater streams.

Are you struggling with:

Operating costs for your wastewater treatment system being too high, eroding your profits?
Your current system operating unstably, frequently encountering issues and causing legal risks?
Valuable land for production having to be allocated for bulky treatment tanks?
Increasing pressure from international partners regarding green standards (Rainforest Alliance, Fair Trade)?

If the answer is “Yes,” you are not alone. At NGO International, we turn these challenges into a competitive advantage for your business.

I. Roasted Coffee Production and Discharge Reduction Requirements

The coffee production process consumes a large amount of water resources and simultaneously generates a significant amount of wastewater and sludge into the environment. While there are many technologies and types of equipment for coffee wastewater treatment, not every factory has access to a solution that is truly suitable in terms of investment cost and emission reduction.

II. Roasted Coffee

In the roasted coffee production process, coffee beans, after harvesting, must undergo processing to remove the fruit pulp and dry the beans before roasting. There are two main processing methods: wet processing and dry processing. Each method involves different steps and has different impacts on the flavor and quality of the coffee.

a. Wet Coffee Processing Method:

The wet coffee processing method is a complex process that requires the use of various machinery and consumes a significant amount of water, typically applied when processing Arabica coffee.

This method produces coffee beans with a bright, clean flavor and is often used for high-quality coffee types.

Process and Characteristics of Wastewater Generated from the Wet Method:

Processing Stage	Task Performed	Wastewater Characteristics
1. Harvesting	Coffee is harvested when the coffee cherries are ripe red. In Vietnam, harvesting methods are typically selective harvesting (hand-picking ripe cherries) or strip harvesting (picking both ripe and unripe cherries).	– Roasted coffee processed by the wet method typically generates a larger volume of water than other methods. – Wastewater generated from production activities has a high concentration of pollutants, mainly from the bean processing stages of soaking, pulping, fermentation, and washing: Total Suspended Solids (TSS): The wastewater contains a high level of suspended solids, primarily from soil, sand, dust, damaged fruit, leaves, and fragments from the coffee cherry pulp and mucilage remaining after cleaning the beans. High Organic Content (COD, BOD): The wastewater is rich in organic compounds, mainly from the pulp, mucilage, and other soluble substances from the coffee fruit. Low pH: The fermentation process releases organic acids, making the wastewater acidic, with a pH typically ranging from 3.5 to 5.5. Color: The wastewater has a dark brown to black color due to the presence of polyphenols and other organic color compounds from the coffee. Nitrogen and Phosphorus: The nitrogen and phosphorus content in the wastewater is relatively high, resulting from the decomposition of natural nitrogenous and phosphorus compounds in the coffee cherries. Foul Odor: The wastewater has a characteristic foul odor due to the decomposition of organic matter and anaerobic fermentation (if it occurs). Microbial Load: The wastewater contains a high load of bacteria and microorganisms from the fermentation process, some of which can be harmful if discharged into the environment without treatment. – Wastewater from cleaning workshops and equipment: This wastewater mainly comes from washing and cleaning equipment and the workshop area. This wastewater has a high TSS concentration, primarily coffee grounds and residue spilled during production, and from cleaning equipment and floors. BOD and COD concentrations come from coffee grounds, damaged beans, or residue left on equipment surfaces. Detergents: Cleaning agents used for machinery, equipment, and the workshop. Oils and grease generated from machine cleaning processes.
2. Wet Bean Processing	– Step 1: Soaking and Sorting Cherries – Step 2: Pulping (Removing Skin and Pulp) – Step 3: Fermentation – Step 4: Washing
3. Drying	After pulping, the coffee beans must be sun-dried or mechanically dried to reduce the moisture content to around 10-12% to prevent mold or spoilage during storage.
4. Hulling and Sorting	– After the coffee beans are dried, the hulling process begins. The beans are fed into hulling machines to remove the parchment layer, leaving only the green coffee beans. – The green coffee beans are then sorted based on size, weight, and quality to ensure uniformity before roasting.
5. Roasting	The green coffee beans are placed in a roaster at a temperature of about 180-240°C for 8 to 20 minutes (depending on the coffee type and roast profile).
6. Cooling and Degassing	– The beans can be air-cooled or water-quenched (for certain roasting methods). – After cooling, the coffee needs a degassing period (from 24 to 48 hours) for the flavors to stabilize.
7. Grinding	Roasted coffee can be ground into powder (fine, medium, coarse grind) or left as whole beans depending on the intended use.
8. Packaging	Roasted and ground coffee, after being ground or kept as whole beans, is sealed in packages for preservation.

b. Dry Coffee Processing Method:

Dry processing, also known as the natural method, is a more traditional and simpler method. Dry-processed coffee often has a sweet flavor, full body, and intense fruity notes.

In Vietnam, roasted coffee is mainly processed using two common methods: the wet processing method and the dry processing method. However, the dry processing method remains the primary and more popular method, especially for the Robusta coffee variety, which accounts for the majority of coffee production in Vietnam (about 90% of total output).

Process and Characteristics of Wastewater Generated from the Dry Method:

Processing Stage	Task Performed	Wastewater Characteristics
1. Harvesting	Coffee is harvested when the coffee cherries are ripe red. In Vietnam, harvesting methods are typically selective harvesting (hand-picking ripe cherries) or strip harvesting (picking both ripe and unripe cherries).	– Roasted coffee processed by the dry method typically generates less water than other methods because the dry method relies mainly on natural sun-drying without using water in the main processing steps. – Wastewater is generated mainly from cleaning workshops and equipment: In large processing facilities, periodic cleaning of machinery and floors can create a certain amount of wastewater containing dirt, coffee residue, and impurities from the production process. Total Suspended Solids (TSS): Wastewater from cleaning can contain suspended solids (TSS) such as dirt, residue from coffee pulp, and other debris from cleaning the beans, as well as coffee grounds spilled during production and from cleaning equipment and floors. Organic Content (COD, BOD): Although there is not a large amount of organic matter from the main production process (as water is not used for fermentation or pulping), wastewater from cleaning can still contain a small amount of organic substances from coffee grounds, husks, and other parts of the coffee cherry. This can increase the COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand) in the wastewater, but at a low level. pH Level: Wastewater from this process typically has a near-neutral pH (ranging from 6.0 to 7.0), as no strong chemical reactions or fermentation occur during dry processing. Color: The wastewater may have a light brown color due to impurities from coffee grounds or soil from the cherries, but it is not as dark as in the wet processing method. Detergents: Cleaning agents used for machinery, equipment, and the workshop. Oils and grease generated from machine cleaning processes.
2. Dry Bean Processing	– Step 1: Drying the Whole Cherry – Step 2: Hulling – Step 3: Cleaning and Sorting
3. Drying	After hulling, the coffee beans must be sun-dried or mechanically dried to reduce the moisture content to around 10-12% to prevent mold or spoilage during storage.
4. Hulling and Sorting	– After the coffee beans are dried, the hulling process begins. The beans are fed into hulling machines to remove the parchment layer, leaving only the green coffee beans. – The green coffee beans are then sorted based on size, weight, and quality to ensure uniformity before roasting.
5. Roasting	– The green coffee beans are placed in a roaster at a temperature of about 180-240°C for 8 to 20 minutes (depending on the coffee type and roast profile).
6. Cooling and Degassing	– The beans can be air-cooled or water-quenched (for certain roasting methods). – After cooling, the coffee needs a degassing period (from 24 to 48 hours) for the flavors to stabilize.
7. Grinding	Roasted coffee can be ground into powder (fine, medium, coarse grind) or left as whole beans depending on the intended use.
8. Packaging	Roasted and ground coffee, after being ground or kept as whole beans, is sealed in packages for preservation.

III. Limitations of Current Wastewater Treatment Solutions for Roasted Coffee Production

Current wastewater treatment methods for roasted coffee production typically combine the following treatment processes:

Mechanical treatment (sedimentation, filtration) to remove suspended solids.
Physico-chemical treatment (coagulation, oil and grease separation) to remove insoluble substances and oils.
Biological treatment (aerobic, anaerobic) to treat organic substances.
Membrane filtration technology to enhance the quality of the treated wastewater.

Current coffee wastewater treatment methods can handle most pollutant concentrations to meet environmental discharge standards and are applied in many coffee production facilities in Vietnam. However, considering various factors including treatment efficiency, cost, feasibility, and environmental impact, there are still many limitations:

– Requires a large area to construct treatment tanks, which can be a challenge for businesses where land needs to be prioritized for production.

– Large volumes of wastewater and high monthly discharge fees to industrial parks/clusters are a significant expense.

– A large amount of sludge is generated that requires subsequent disposal, further increasing treatment costs.

– Biological treatment methods are quite sensitive to fluctuations in pollutant loads, causing many factories to face operational difficulties and frequent incidents.

– High energy consumption, which indirectly increases greenhouse gas emissions.

IV. The Solution from NGO International Co., Ltd

We understand that businesses are striving to increase their competitiveness in the market and need to meet increasingly high demands for Sustainable Development, including standards such as Rainforest Alliance, UTZ Certified, and Fair Trade.

NGO has spent years collecting operational data from coffee production plants in Vietnam, as well as operational data from coffee wastewater treatment plants, to research and develop a solution focused on energy saving and resource reuse:

– Saving Land Resources: The wastewater treatment plant is designed with high efficiency, allowing for a 50% reduction in the construction footprint.

– Energy Saving: For plants with high pollutant concentrations (COD ~ 10,000 – 20,000 mg/L), we guarantee that power consumption will always be lower than 3 kWh/m³.

– Saving Water Resources and Reducing Sludge:

Reuse of treated water: NGO will advise on various options for reusing wastewater at the plant, ensuring that the total water consumption per ton of product is optimized.
Reduction and recycling of sludge from production: The treatment plants will focus on reusing sludge to produce fertilizer or recycling it into raw materials, helping to minimize waste discharged into the environment and supporting a circular economy model.

– Reducing Chemical Use: Utilizing biological treatment methods with high tolerance to input fluctuations, which helps stabilize the entire system’s operation and minimize emissions and negative environmental impacts.

– Enhancing Climate Change Adaptability

Resilience and adaptation to climate change: The design of future wastewater treatment plants must consider the ability to withstand changes in weather and climate, such as heavy rain, floods, or droughts, ensuring stable operation under harsh conditions.

V. Case Study

The Challenge: A wet processing plant with a capacity of 500 tons of fresh cherries per season. The old system was frequently overloaded, the effluent did not meet QCVN standards, and monthly electricity and sludge disposal costs amounted to 80 million VND.
NGO’s Solution: We designed and installed a combined system of anaerobic UASB and aerobic MBBR technology.
The Results:
- Effluent quality consistently meets Column A of QCVN 40:2011/BTNMT.
- 60% reduction in operating costs (electricity, chemicals).
- 50% of water reused for floor washing and pre-processing areas.
- Sludge volume was significantly reduced and utilized as fertilizer for the company’s own coffee gardens.
- The factory confidently meets the standards of European customers.

“Since partnering with NGO International, we have had complete peace of mind regarding environmental issues. The new system is not only compact and cost-effective but also operates with extreme stability. Their team of experts is very knowledgeable about the coffee industry and provided us with an incredibly practical water reuse solution. This was a worthwhile investment.”
– Mr. N.T.L, Coffee Factory Director

VI. Frequently Asked Questions

What is the investment cost for an NGO coffee wastewater treatment system?

The cost depends on many factors: capacity, processing method (wet/dry), influent water quality, and required effluent quality. Please contact us for a site survey and the most detailed, transparent quotation.

Is the system easy to operate?

We prioritize highly automated solutions to minimize human intervention. NGO International will provide thorough training and technology transfer to your team until they can operate it proficiently.

How long does it take to construct a system?

Typically, it takes 3-6 months, depending on the scale and complexity of the project, including the design, construction, and commissioning phases.

How is the sludge handled after treatment?

Our solutions focus on sludge minimization and reuse. We will advise on options such as sludge dewatering, drying, and composting to turn sludge into a valuable resource.

My company already has an old system. Can NGO upgrade it?

Absolutely. Upgrading existing systems to improve efficiency and reduce operating costs is one of our strengths. This is often more cost-effective than building a new one.

NGO International Co., Ltd is committed to providing the most advanced and modern technologies to help businesses not only minimize discharge but also enhance production efficiency and protect the environment. Contact us to learn more about wastewater treatment solutions for roasted coffee production for your business via phone at 024.7300.0890 or email office@8ngo.com for a direct consultation.

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This website is copyrighted by NGO International Co., Ltd. Any form of use or duplication of part or all of the content in any form is strictly prohibited, except with express written permission from Us.

WASTEWATER TREATMENT SOLUTIONS FOR INDUSTRIAL CLUSTERS, INDUSTRIAL PARKS

devsite — Tue, 22 Feb 2022 09:14:01 +0000

According to the data from the Ministry of Planning and Investment as of the end of March 2021, the country currently has 392 established industrial parks with a total natural land area of about 119.9 thousand hectares (out of the total 575 industrial parks in the development planning of industrial parks in Vietnam as approved by the Prime Minister).

Of 392 established industrial parks, 286 industrial parks have officially come into operation with a total natural land area of about 85.2 thousand hectares, an industrial land area of about 57.3 thousand hectares and 106 industrial parks are under basic construction process with a total natural land area of about 34.7 thousand hectares, industrial land area of about 18.2 thousand hectares.

Vietnam is emerging as a new industrial production center in Asia and receiving an increasingly large wave of FDI investment, so the number of investment projects in the field of infrastructure for industrial parks, industrial clusters is very vibrant. INDUSTRIAL URBAN ZONE development is emerging as one of the prominent trends in recent years. “Green Value“, “Sustainable Development” become KEY SELLING POINTS in the race of infrastructure investors to attract the customers, increase economic and service revenue, but not, any investor has enough financial potential to invest in GREEN infrastructure even though it clearly understands the value this benefit brings.

POPULAR INDUSTRIAL PARK, INDUSTRIAL CLUSTER WASTEWATER TREATMENT STATIONS IN VIETNAM

iIn Vietnam, most centralized wastewater treatment systems of industrial parks, industrial clusters use the following three technology groups:

CRITERIA	TECHNOLOGY 1	TECHNOLOGY 2	TECHNOLOGY 3
CRITERIA	Physicochemistry + A-O microbiological treatment	Physicochemistry + SBR or ASRB	Physicochemistry + microbiology + MBR
Main steps in the technology diagram	1. Collecting tank 2. Regulating tank 3. Flocculation reactor (PAC Polymer) 4. Physicochemical settling tank 5. Anoxic microbial tank 6. Aerobic microbial tank 7. Biological sedimentation tank 8. Disinfection and discharge compartment 9. Sludge tank	1. Collecting tank 2. Regulating tank 3. Flocculation reactor (PAC Polymer) 4. Physicochemical settling tank 5. SBR batch microbial tank 6. Disinfection and discharge compartment 7. Sludge tank	1. Collecting tank 2. Regulating tank 3. Flocculation reactor (PAC Polymer) 4. Physicochemical settling tank 5. Anoxic microbial tank 6. Aerobic microbial tank 7. MBR membrane tank 8. Disinfection and discharge compartment 9. Sludge tank
Advantages	– Simple design – Treat domestic TN effectively – Easy to adjust during operation	– Smaller treatment tank volume than Technology 1 – Save construction area – Operating the phases in the treatment tank in batches is often fixed, with little space to adjust when necessary during operation	– Water quality is often stable, better than Technology 1 & 2 thanks to MBR membrane steps – Save construction area
Disadvantages	– A-O microbial tanks often require a large area	– When input TN or Ammonium fluctuates highly, treatment is often difficult to achieve.	– Investment costs are often higher than Technology 1 & 2

NGO ACCOMPANIED WITH INFRASTRUCTURE INVESTORS

NGO does not aim to SELL AVAILABLE SOLUTIONS to the enterprises, instead, we wish to ACCOMPANY with the Investors, as BEST CONSULTING PARTNER ON COSTS for the Investors throughout the entire construction, development and maintenance process of industrial parks, industrial clusters

Consulting on pollution treatment plans suitable for each stage of development of industrial parks, industrial clusters while still ensuring compliance with legal requirements
The design solution is always the most optimal in terms of area and wastewater treatment fees in industrial parks, thereby reducing up to 75% of construction investment costs and saving costs of pipes and technological supplies. We are committed to providing providing the most optimal solution currently on the market regardless of which technology the Investor chooses.
The technology used is suitable for both discharge purposes and water reuse purposes
Committed to supporting the operation and management of industrial park wastewater to ensure water quality as designed
The solution has been proven by actual industrial park wastewater treatment plants

NGO always improves, constantly creates and optimizes its design options through experience accumulated through each project, as well as technology transfer from reputable partners around the world.

Please contact us for detailed advice.

More informations:

https://shopngoenvironment.com/product/thiet-bi-mang-loc-e-mbr/

https://shopngoenvironment.com/product/mang-loc-mbr-x/

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Trang web này thuộc bản quyền của Công ty TNHH Quốc tế NGO (NGO International). Bất kỳ hình thức sử dụng hoặc sao chép một phần hoặc toàn bộ nội dung dưới mọi hình thức đều bị nghiêm cấm, trừ trường hợp được sự cho phép rõ ràng bằng văn bản từ Chúng tôi.

NEW ELECTROCATALYTIC TECHNOLOGY FOR AQUACULTURE WASTEWATER TREATMENT

devsite — Fri, 21 May 2021 07:04:00 +0000

With optimal design, simple operation, electrocatalytic technology is effectively applied to treat aquaculture wastewater by using electrolysis catalytic reaction equipment to thoroughly remove pollutants in wastewater such as COD, BOD, Ammonium or pathogenic microorganism.

1. Composition of aquaculture wastewater:

In Vietnam, besides the forms of aquaculture in cages, the forms of aquaculture in ponds and lakes are very popular and developed in many localities throughout the country. The main aquaculture species are freshwater fish, prawns, black tiger shrimp … With the rapid development of the aquaculture industry in recent years, a large amount of wastewater from many aquaculture units has not been thoroughly treated, leading to the risk of polluting water sources in general and lakes water in particular, significantly impacting on aquatic life and human life.

Aquaculture wastewater in general and wastewater from fish, shrimp farming in particular have high concentrations of COD, BOD, N and harmful microorganisms due to organic sources from surplus feed, bio-products used in stock-raising and waste water from livestock.

1.1 Characteristics of wastewater from fish farming:

Fishpond water is polluted mainly by excess organic matter in water from food sources. The fact that, only about 17% of food is absorbed by fishes and the rest (about 83%) mixed in water then becomes decomposed organic matters. Stool and other wastes shall deposit in the bottom of pond, which make COD, BOD, N and other pathogenic microorganisms increase. If the waste source is discharged into the environment, it will cause eutrophication at receiving sources or algae blooms. In addition, wastewater containing residual chemicals (e.g: antibiotics for fish) must be treated.

1.2 Characteristics of wastewater from shrimp farming:

Wastewater of shrimp farming contains large amounts of nitrogen, phosphorus and other nutrients, which cause super-nutrients, thereby increasing the initial productivity and proliferation of bacteria. The presence of carbonic compounds and organic matter will reduce dissolved oxygen and increase BOD, COD, hydrogen sulfide, ammonia and methane content in natural waters. Another problem caused by shrimp farming is sludge sedimentation in the surrounding areas, such as mangroves. Most of substances in shrimp farming water are deposited at the bottom, which is a threat to shrimps, and shrimp farming. This mud layer is very toxic, contains many harmful substances such as ammonia, sulfur compounds….

2. Treatment solution applied to wastewater in aquaculture ponds and lakes using electrocatalytic technology.

2.1 Advantages:

Directly treat wastewater in ponds and lakes without affecting fishes and shrimps;
Water in ponds and lakes are continuously treated by using electrolysis catalytic reaction equipment immediately. The method saves water and periodic water changing cost;
Simple operation and periodic cleaning;
Decontaminating harmful wastes such as ammonia (NH3) and nitrite (NO2-) to help keep aquatic life in clean and healthy water.
Break down protein and nutrients, reducing total organic matter levels in water
Reduce the start-up time of the tank/ pond (Nitrogen Cycle) and prevents new tank/pond syndrome
Minimize odor from pond water
Improve the transparency of water
Support to increase the longevity, density and weight of shrimps and fishes in the ponds, thereby improving economic efficiency.

Hệ thống xử lý nước thải nuôi trồng thủy sản sử dụng công nghệ xúc tác điện hóa

2.2 Operating Principles:

Mô tả phản ứng xúc tác điện hóa

Electrocatalytic treatment technology for aquaculture wastewater which contains a large amount of salts, organic matter, sulfur compounds, heavy metal ions, acid, alkaline … This technology uses oxidation reaction of the hydroxyl (OH) free radical group with very strong reaction in short time. Most of the organic waste through the system is quickly broken down into carbon dioxide, water, and smaller organic and inorganic ions through oxidation.

With many economic benefits for farmer, optimized design, simple operation and cost saving, aquaculture wastewater treatment solutions by Electrochemical catalysis technology introduced and developed by NGO will contribute to the effective treatment of pollutants in aquaculture wastewater, ensuring that after-treatment water meets the requirement of QCVN 01-80: 2011 / BNNPTNT standard.

More:

https://shopngoenvironment.com/product/thiet-bi-ras-filter/

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SMART B – SUPER-SAVING AND OUTSTANDING SOLUTION FOR AMONIUM & NITROGEN REMOVAL

devsite — Thu, 10 Oct 2019 08:41:17 +0000

SMART B – B Standard domestic wastewater treatment system, easy operation, small footprint and extremely low initial investment cost, highly effective in ammonium removal, suitable for factories in industrial zones which must comply with QCVN 40 specification of total nitrogen (TN).

According to Decree No. 80/2014/NĐ-CP of Government dated August 2016 regarding wastewater drainage and treatment, wastewater from drainage system of municipal area, industrial zone, concentrated rural residential area discharging into receiving source must meet environmentally technical specification of Ministry of Natural Resources and Environment.

In which, wastewater from factories in industrial zone discharging into concentrated drainage system of industrial zone must comply with prevailing regulations on environmental management in industrial zone, in particular, QCVN 40:2011/BTNMT specification, which stipulate that B-Standard is the lowest applicable level.

For enterprises locating outside Industrial Zone, Industrial Complex, treatment standard shall comply with QCVN 14:2008/BTNMT, column B or A.

1. In the treatment of domestic waste water, which parameter is the most commonly exceeded?

Depending on the applicable standard is QCVN 14 or QCVN 40, the main parameters to be treated include COD, BOD, TSS (suspended solids), Ammonia, TN (total nitrogen), TP (total phosphorus); in which the most difficult to handle is Ammonia & TN. If Ammonia and TN are removed well, other remaining parameters obviously meet the standard.

2. Why do enterprises now face with difficulties in choosing solutions?

Solutions need large footprint area or too expensive cost;
Many small Wastewater Treatment Contractors offering cheaper cost, but not ensure quality and fail to provide good after-sales service;
Lack of resource & skills to operate the system;
Lack of technology knowledge to compare and choose the suitable contractor;
Having experienced with bad quality wastewater treatment system, and loosing trust in contractors;
Pressure from local authorities.

3. What called Smart B ?

SmartB is the trade name of domestic wastewater treatment solution launched by NGO on the basis of moving or static microorganism filter (biofilm), capable of overcoming the disadvantages of traditional activated sludge technology or MBBR, commits to stable processing efficiency while ensuring low investment costs.

4. Eight out-standing advantages of SmartB

Low power consumption (<0.2kWh)
Total volume required for treatment system always less than total discharge capacity.
Microbiology completely not exist suspended in wastewater but adheres to materials layers in the form of biofilm, which lead to high shock-resistance capacity of microbiology when the environment and discharging activities have been changed, maintain stable treatment results;
Sludge density reaches 8000 mg / l; decreases up to 50% area compared to traditional solutions.
Exceptionally effective treatment of ammonium, including high-grade ammonium with ammonium concentration of more than 60 mg / L due to environmental separation for reducing COD, BOD microorganisms and nitrifying bacteria (nitrifiers)
Small volume of sludge, sludge discharging cycle is more than 06 months;
Simple operation, don’t worry about wash-out or loss of microorganisms during operation, no need to manage the flocs of microorganisms in reaction tanks.
Mobile design system and easy transportation when relocating or transferring.

5. Smart B Treatment Process

Wastewater after coarse screening and grease removal, shall be pumped into the SmartB treatment system, where anoxic and aerobic microbiological reactions will take place under the environment of evenly distributed DO (Dissolved oxygen) within the reaction tanks. Dissolved oxygen is controlled less than 0.3 in anoxic tank and more than 1.0 in aerobic tank. Anoxic tank has the function of removing COD, BOD and NO3-. Aerobic tank functions as removing COD, BOD, and NH4 +. After the organic and nutrient components are thoroughly treated in microbiological tanks, water will be filtered in the Filter tank to remove most of the suspended solids TSS before being discharged into the environment.

6. Why NGO is your good choice?

We are equipped with excellent technological background, being representatives of many worldwide well-known technology brands in Vietnam with strong development strategy. Successfully proven through more than 30 projects.
With NGOs, enterprises will be instructed with tools to perform water quality testing on their own, without relying on third parties, thus can self-check the quality of contractors and any testing service agency;
After-sales service is always available for any advice, support or troubleshooting through telephone, zalo, or in-site support.
Water quality after treatment is stable, no worry about Government’s inspection

Case study 1: Project in Bac Giang Province

Case study 2: Project in Vinh Phuc Province

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PETROLEUM WASTEWATER TREATMENT SOLUTION

devsite — Tue, 06 Aug 2019 06:47:13 +0000

Petroleum wastewater treatment solution provided and implemented by NGO is thoroughly treating mineral oil by chemical adsorption and has much cheaper cost.

Oily wastewater is mainly composed of mineral oil, in addition garbage, sediment, clay, surfactants, etc.

Essence of oil is dense liquid, with a featured odor, lighter than water, which is slowly oxidized, can last up to 50 years.

1. Oily wastewater exists in the following status:

Free-form: This oil will emerge and create oil film. Oil is present in the form of free-oil seeds or mixed with water. Free oil will float on the surface because the specific gravity of oil is lower than the specific gravity of the water.
Emulsion-form: Formed by chemical agents such as soap, caustic soda, detergents, etc., or asphaltene chemistry altering surface tension and chemically stabilizing the dispersed oils.
Soluble-form: Soluble molecules.

2. Major sources of oily wastewater include:

Water uses for periodically cleaning tank at petroleum depots to ensure fuel quality.
Drain out tank-bottom water after ending the process of ship entering into the storage tank.
Periodic industrial sanitary water and after finishing amendment of technology, equipment in petroleum depots.
Rain water falls on the area that can contaminate the oil at the storage and petrol stations.
Water use for floor cleaning, car wash, car maintenance.
Cooling water or sewage from mechanical factories

3. Treatment solutions currently applied to petroleum production waste water:

Coagulation, floatation method: Low cost, easy deployment but not thoroughly treated, because super-small mineral oil molecules are difficult to fully coagulate or flotation. Therefore, after-treatment water normally still contains oil.
Filtration method by using membrane: Can filter up to 90% of the amount of gasoline in the effluent or higher depending on the filtered material. The cost of treatment is usually very high, the material is not reusable and after-treatment water may still has the characteristic smell of oil.
Material-adsorption method: Can remove oil thoroughly, but the material is quickly saturated (for example, oil-impregnated cloth), easy to be clogged, especially in waste water with high TSS content, high processing costs

Oil contaminated wastewater treatment systems

After the study period, NGO could provide a solution Oily wastewater treatment that can thoroughly treat mineral oil by chemical adsorption and has much cheaper cost than using adsorption materials. Reaction time is shorter and mineral oil is removed almost completely. After-treatment water has no odor. The solution is suitable for projects with small scale discharge capacity as well as projects with large discharge capacity.

Wastewater with reside generated from storage tank rinsing process (1-2 year/time) is the effluent source of highest oil contaminated level, from tens to tens of thousands ppm. Characteristics of this type of wastewater is high concentration of oil and high inorganic residue.

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HIGH-TECH WASTEWATER TREATMENT SOLUTIONS IN THE PLATING INDUSTRY

devsite — Mon, 05 Aug 2019 12:43:01 +0000

The solution to plating wastewater treatment with high technology, little or no use of chemicals and no separation of currents, ensure the output water meet standard A.

1. Discharge source

1.1 Classification of plating technology:

Electroplating: is the most widely used method today. Electroplating is the process of electrochemical cathode poles. Metal surface as cathode in an electrolytic vessel using an external DC power source, the plating solution is anode containing metal ions to be plated. These metal ions participate in cathode reaction and are de-electrochemical into electrolytic metal and precipitate on the surface to be treated.
Chemical plating: is a method based on chemical reduction, metal ions are reduced to metal from its salt solution by reducing agents. The electronics required for the reduction process are provided by chemical reducing agents. For example, in Nickel Plating, sodium hypophosphite is used as a reducing agent
Hot dip galvanizing: is the process in which the material to be plated passes through a metal storage tank (pure metal), which is melted at a high temperature, resulting in the metal plating on the surface of the materials to be plated.

.2 Basic plating process:

1.3 Sources of wastewater:

Wastewater from the plating process: The solution in the plating tank can leak, scatter or stick to the plating jigs and outward details. After a period of operation, the plating tanks need to be cleaned by discharging dirt and sediment along the wastewater stream. Therefore, the amount of wastewater is not much, but pollutants are diverse, with a high concentration of pollutants (Cr6 +, Ni2 +, CN–…)
Wastewater from surface cleaning process: There is grease on metal surfaces due to mechanical curing and polishing. To ensure the coating quality, the parts need to be cleaned by chemical degreasing, solvents or electrochemical before plating. Therefore, the volume of wastewater generated in this process is large but the concentration of pollutants is low, mainly containing alkalis, acids and solutions.

2. Composition and characteristics of wastewater

Wastewater from plating process contains a lot of heavy metals, which has significant long-term impact on the environment, leading to future consequences because if the wastewater is not treated properly, metal ions, salts and other compounds will exist and be accumulated in the natural environment instead of being degraded when they are released into the environment.
This type of wastewater can destroy plankton, cause poisoning and disease to aquatic animals, especially fish (one of the links in the food chain in which humans are involved) that causes dangerous diseases in humans. The process is called bioaccumulation in which toxins derived from metals are released into the environment, and gradually accumulate in aquatic animals for a long time, following many food chains, affecting to people. Therefore, it is necessary to have a plating wastewater treatment system that separates metal ions before being discharged into the environment in accordance with the prescribed standards in Vietnam.
Plating wastewater has a variety of concentrations, pH varies widely from being acidic (pH = 2 – 3) to very alkaline (pH = 10 – 11). A common feature of plating wastewater is that it contains a high content of inorganic salts and heavy metals. Depending on the metal of the coating, the source of pollution can be Cu, Zn, Cr, Ni, etc., and depending on the metal salt used, the wastewater contains toxins such as cyanide, sulphate, ammonium, chromate, etc. Organic substances are rarely found in plating wastewater, the main part is flocculants, surfactants, etc. Therefore, the BOD, COD or grease are often low and not main objects of the treatment process. The main treatment objects are inorganic ions, especially heavy metal salts such as Cr, Ni, Cu, Fe, Zn, etc., with high pH and high temperature.
For factories using industrial salt in the production process, wastewater often has high nutritional Ammonium and Nitrogen content, even high chlorine generated by the salt electrolysis process, which are quite difficult to be treated and the cost of treatment is high.
Typical plating wastewater characteristics (*) Pollution values do not include high-concentrated pollution effluents

3. Công nghệ xử lý nước thải xi mạ phổ biến tại VN

Current wastewater treatment system applies a chemical precipitation method for metals present in the wastewater. This method should strictly follow reaction conditions for maximum removal of heavy metals. The typical metals of the wastewater stream are: Chromium, Zinc, and Nickel are all amphoteric metals. Their chemical precipitates can all dissolve in the excess alkaline environment. Thus, if the pH control process is not followed, the metal will not be removed as much as possible so that the water quality can be improved to meet QCVN 40: 2011/BTNMT.
The chemicals commonly used to treat plating wastewater are FeSO4, FeCl, H2SO4, Na2S2O5, PAC, Polymer.

4. NGO’s solutions to wastewater treatment

LESS OR NO CHEMICAL USED to remove heavy metals and other pollutants in water, which helps reduce chemical costs, with easier and less toxic operation, reducing sludge generated, limit the cause of secondary pollution.
Because of chemical-free and not subject to PH conditions to coagulate each metal component, the NGO’s solution allows to treat all wastewater effluents generated in the plating process with no separation of currents, thereby minimize number of tanks and the complexity of treatment process, and simplify the wastewater collection systems from various production segments.

4.1 Plating wastewater treatment solution using various types of filtration technology.

4.2 Plating wastewater treatment solution using electrochemical technology.

4.3 Water sample after treatment

More:

https://shopngoenvironment.com/product/mang-ro-xu-ly-nuoc-thai/

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A BREAKTHROUGH IN COLOR TREATMENT OF TEXTILE DYEING WASTEWATER & INDUSTRIAL WASHING

devsite — Thu, 27 Dec 2018 08:06:54 +0000

Vietnam’s garment industry is one of the key economic industries that attracts many laborers and brings a lot of foreign currency to the country. However, in the value chain of the industry, there are many production stages such as dyeing, printing, completing, industrial washing, discharging large amounts of wastewater, which has great impact to the environment.

It is estimated that the amount of wastewater discharged from the textile dyeing processes is very large; from 120 to 300m3/ton of fabric, the weaving and dyeing stage requires from 12 to 65 liters of water for 1 meter of fabric and discharges from 10 to 40 liters of water. Textile wastewater is very diverse and complex. According to calculations from the types of chemicals used such as: dyes, surfactants, electrolytes, lozenges, media, starch, enamel, oxidants …There have been hundreds of typical chemicals such as solutes and heavy metals.

1. Composition and characteristics of textile dyeing wastewater

Wastewater from textile industry includes main pollutants: High temperature, impurities separated from textiles such as grease, nitrogen-containing compounds, pectin, dirt sticking to fibers; chemicals used in technological processes such as starch starch, H2SO4, CH3COOH, NaOH, NaOCl, H2O2, Na2CO3, … dyes, auxiliaries, soak, colorant, detergent. The amount of chemicals used depends on the type of fabric, color and mainly goes to the wastewater of the manufacturing stage.

1.1 Pollutants and wastewater characteristics of textile and dye industry

Stage	Pollutants in wastewater	Characteristics of wastewater
Sizing and desizing	Starch, glucozo, carboxymethyl cellulose, polyvinyl alcohol, plastic, fat and wax	High BODOD
Boiling, discoloration	NaOH, wax and grease, ash, soda, sodium silicate and shredded fibers	High alkalinity, dark color, high BOD
White bleaching	Hipoclorite, chlorine compounds, NaOH, AOX, acids, etc	High alkalinity, accounting for 5% of BOD
Polishing	NaOH, impurities	High alkalinity, low BOD
Dyeing	The main dyes include reconstituted dyes, dispersants, active substances, direct agents, acids, cations, acids and metal salts.	High color, high BOD (6% of total BOD), high TSS
Printing	Pigments, starch, oil, clay, metal salts, acids, etc.	High color, high BOD and grease
Completing	Starch, animal fat, salt	Mild alkali, low BOD, small amount
Industrial washing	Regular washing or Denim washing	High color, low BOD

(Source: Wastewater treatment technology using biological methods – Assoc. Prof. PhD. Luong Duc Pham)

1.2 Wastewater characteristics of some dyeing factories in Vietnam

Parameter	Unit	Woven cotton products	Knitwear products	Woolen textiles	Fiber
Wastewater	m3/t. of textile	394	264	114	236
pH	–	8 – 11	9 – 10	9	9 – 11
TSS	mg/l	400 – 1000	950 – 1380	420	800 – 1300
BOD₅	mg/l	70 – 135	90 – 220	120 – 130	90 – 130
COD	mg/l	150 – 380	230 – 500	400 – 450	210 – 230
Color	Pt – Co	250 – 600	250 – 500	260 – 300	–

(Source: Faculty of Environment – Hanoi University of Science, 2004)

1.3 The composition of dyeing wastewater is presented in the following table:

Indicator	Unit	Result
Indicator	Unit	Activated substance wastewater	Sulfur wastewater	Bleaching wastewater
pH	–	11-Oct	>11	>12
COD	mg/l	450 – 1.500	10.000 – 40.000	9.000 – 30.000
BOD₅	mg/l	200 – 800	2.000 – 10.000	4.000 – 17.000
Total N	mg/l	5 – 15	100 – 1.000	200 – 1.000
Total P	mg/l	0.7 – 3	7 – 30	10 – 30
SS	mg/l	–	–	–
Color	Pt-Co	7.000 – 50.000	10.000 – 50.000	500 – 2.000
Turbidity	FAU	140 – 1.500	8.000 – 200.000	1.000 – 5.000

(Source: Faculty of Environment – Ho Chi Minh City University of Technology)

Basically, textile-dyeing wastewater often has high temperature, high level of color, pH> 9, high BOD and COD. On the other hand, wastewater from textile industry contains some chemicals with heavy metals, toxic components that not only destroys aquatic organisms but also has negative and direct impact on human life.

Current technology of textile wastewater treatment

2. Wastewater treatment technology of textile and dyeing industry is currently applying common technologies:

Combination of chemical-physical method (coagulation / flocculation) and filtration;
Combination of chemical-physical method and aerobic biological treatment or vice versa;
Combination of chemical-physical method, aerobic biological and chemical-physical treatment;
Combination of chemical-physical method, biological treatment and filtration (sand filter or activated carbon)

Diagram of the current technological process of textile dyeing wastewater treatment:

In general, the traditional technologies currently applied to the textile wastewater treatment still have many difficulties for businesses, for example:

Using chemicals mainly can eliminates dispersed colors only, more complex color components such as reactivation and reconstitution are often impossible to be removed.
When using many chemicals, operating costs will be very high, it is especially difficult to quantify chemicals for flocculation steps, or Fenton due to production by order, color composition and pollution concentration of wastewater often fluctuates according to orders.
Microbiological systems are often large, requiring a lot of space

NGO with breakthrough solution to color treatment

• Eliminates above 95% of all colors, including activated color, no use of flocculating or decolorizing chemicals, less produced sludge.

• Color treatment efficiency is independent of the microbiology and weather fluctuations • Results are visible on the first day of operation, without waiting

NGO với giải pháp ĐỘT PHÁ trong xử lý màu

Eliminates above 95% of all colors, including activated color, no use of flocculating or decolorizing chemicals, less produced sludge.
Color treatment efficiency is independent of the microbiology and weather fluctuations
Results are visible on the first day of operation, without waiting

3. Practical case studies in Vietnam

Tại Saitex Đồng Nai, nhà máy đã áp dụng giải pháp ZERO DISCHARGE (0 xả thải) cho hệ thống xử lý nước thải Demin với công suất 1000 m3/ngày đêm, sử dụng các công nghệ tiên tiến gồm: VI SINH – ĐIỆN PHÂN KEO TỤ – LỌC UF & RO

Tái tuần hoàn nước 98%
Thời gian hoàn vốn đầu tư cho toàn bộ hệ thống ~ 2 năm
Không cần quan trắc chất lượng nước định kỳ với cơ quan chức năng do không xả thải

* Color treatment process is extremely simple: Textile wastewater is firstly collected to the flow equalization basin with aeration, and then pumped onto the Decoloring Device by electrolytic oxidation; at this step, metal ions and electrons are generated, creating redox reactions to break down the emulsion, destroy colloids and suspended solids. Fe ++ or Al ++ ions are released from the electrode, creating stable flocculants to remove most of the color in wastewater by flotation or gravity deposition or mechanical filtration, leaving the clear water be discharged or pumped into the next treatment facility. In particular, the contaminated components including heavy metals, grease and most of the COD are also removed at the same time of color treatment.

3. Practical case studies in Vietnam

https://style-republik.com/saitex-nha-may-san-xuat-jeans-tac-dong-moi-truong/

Mores: Wastewater treatment of textile and dyeing industry video: hhttps://www.youtube.com/watch

More:

https://shopngoenvironment.com/product-category/san-pham-cong-nghiep/thiet-bi-loc/

https://shopngoenvironment.com/product/mang-ro-xu-ly-nuoc-thai/

https://shopngoenvironment.com/product/thiet-bi-mang-loc-e-mbr/

https://shopngoenvironment.com/product/mang-loc-mbr-x/

https://shopngoenvironment.com/product/thiet-bi-keo-tu-dien-phan-ec/

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WASTEWATER TREATMENT SOLUTIONS TO PAPER MANUFACTURERS

devsite — Tue, 16 Oct 2018 02:07:54 +0000

Wastewater treatment solution to paper industry of NGO with 3 levels of treatment, allowing businesses to recover powders, yarn separation up to 93%, treat COD and color in wastewater, ensure water after treatment reaches Standard A and can be recirculated up to 95% for production.

Compared with many other manufacturing industries, paper industry (including cultural paper, packaging paper, wrapping paper, votive paper, etc.) will have a high level of pollution, large emissions and greatly affects people and the surrounding environment, if pollution from untreated wastewater sources is not solved.

In addition, handlling the high level of pollution in paper wastewater, and meet the needs of water treatment or water reuse of businesses is a headache for many business owners.

Unlike simple types of wastewater, such as domestic wastewater, urban wastewater, etc., environmental consultancy units without knowledge of production characteristics of paper industry, or have never handled paper wastewater will have no ability to provide a reasonable solution to this industry’s wastewater.

1. Nature of waste discharge sources during production

No.	Waste sources	Pollution characteristic
1	From cooking process and after-cook washing	Contains most dissolved organic substances, cooking chemicals and a part of fiber. – Organic composition: mainly in lignin black solution dissolved in alkaline solutions, hydrated hydrocarbon products, organic acids. – Inorganic composition: Contains cooking chemicals, mainly alkali Natrisulfite which links organic substances in alkali. In addition, there is a small part is NaOH, free Na2S, Na2CO3.
2	From bleaching or ink removal	In this stage, chemical or semi-chemical method is usually applied, containing organic compounds, soluble lignin, etc., combined with toxic detergents that have the ability to bio-accumulate like organochlorine compounds. It has high BOD5 and COD values that can be up to 700mg/l and 2500mg/l. The concentration of suspended solids is many times higher than the permitted limit. It is difficult to handle high colour level with either microorganisms or chemicals.
3	Waste from pulping and paper forming process	Wastewater at this stage contains raw waste (such as bandage), fibres (cellulose), pulp in suspended form, additives such as turpentine, colouring, kaolin, linear starch, buffer
4	Waste from equipment washing, floor washing, and overflow	Waste contains suspended substances and spillage which can be removed by filtering or settling
5	Domestic wastewater	It is often overlooked and still flushed straight into the drainage system behind the septic basin

Thành phần nước thải của một số nhà máy sản xuất giấy và bột giấy với nguyên liệu là gỗ và giấy thải:

Image of paper production wastewater

2. What are the differences and added benefits for businesses that NGO’s solutions bring to the paper industry?

Recover up to 95% of cellulose fibres in wastewater and return to production with good yarn quality
Be able to split short and long fibres for production purposes of the enterprise
Use less chemical; ensure savings of 30% – 50% on chemical costs compared to current technology on the market
Ensuring high recirculation rate for production, saving water costs, reducing the amount of waste discharged into the environment, ensuring a stable microbiological system.
Design to be 100% non-microbiological and commit to A standard if the enterprise does not want to use microbiological solutions, operate at desired time instead of 24/24h operation.

We have experience in pulp and paper wastewater treatment of over 400 paper mills worldwide in order to provide suitable solutions to businesses in Vietnam, committing to quality with dedicated service.

Mores: Wastewater treatment solutions to paper manufactuers https://www.youtube.com/watch

If you are interested in solutions to wastewater treatment at slaughterhouse, please contact NGO by phone number (024) 7 3000 890 or email office@8ngo.com for direct advice.

Xem thêm tại:

https://shopngoenvironment.com/product/thiet-bi-tuyen-noi-cau-truc-ngang/

https://shopngoenvironment.com/product/thiet-bi-tuyen-noi-sedicell/

https://shopngoenvironment.com/product/thiet-bi-tuyen-noi-supercell/

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A-STANDARD DOMESTIC WASTEWATER TREATMENT SYSTEM BY MBR TECHNOLOGY

devsite — Sun, 14 Oct 2018 09:11:43 +0000

1. What are the differences between MBR (membrane bio reactor) with other wastewater treatment technologies?

The characteristics of domestic wastewater are various impurities, of which 52% are organic, 48% are inorganic substances and a large number of microorganisms in the form of viruses and pathogenic bacteria. Domestic wastewater often contains quite high nutrient content (Nitrogen, phosphorus), so the most common treatment solution is still microbiological treatment.

MBR technology used to treat pollutants in wastewater is still based on biochemical reactions of normally suspended activated sludge but with additional bio-filtration equipment MBR to:

Remove sediment tanks and disinfection tanks, because MBR membranes with micro-sized pores can filter most suspended solids (TSS) and bacteria (coliforms) in wastewater
Build a wastewater treatment system in a small space
Upgrade wastewater treatment capacity without the need of building more tanks
Retain sludge in membrane tanks, sludge only disappears when sucked, does not worry about loss of passive sludge like biological sedimentation method.
After-treatment water achieves high transparency

2. Are there many types of MBR? Which type is good?

MBR have many different types and brands, in order to select a good membrane, the following criteria should be paid special attention to:

Transmembrane pressure (TMP): the higher the pressure, the worse the membrane material
Membrane cleaning frequency: The more frequently the membrane requires to be cleaned (for example, once a week) or using a high concentration of chemicals to clean, proves that the material of MBR is not good and easily to get clogged.
Membrane cleaning method: If the membrane must be taken out of from the tank to wash, this is an old, obsolete membrane technology. Advanced MBR technology must allow cleaning while membrane is still submerged in wastewater in reaction tank, there is no requirement to lift up membrane out of tank or empty the tank to conduct membrane cleaning.

3. How is the MBR system design provided by NGO?

System design is extremely compact, consists of only 1-2 main reaction tanks, can be designed underground, on the ground or semi-underground.

The total required space of the treatment system is always smaller than the total discharge capacity per day, especially saves space and construction investment cost.

Illustration of Treatment system

Processing description

Pretreatment: Pretreatment process is very important because it eliminates coarse solids in order not to clog the pumps and water transmission pipe system. Then, grease removal compartment with the purpose of not hindering useful microbiological process in treatment station. Fats and oil separation compartment is especially necessary for the treatment of wastewater from cafeterias.

Balancing tank: Due to the operational characteristics of the plant, much water used during the day, and less at night, the wastewater flow is constantly changing and has a large difference. Therefore, it is necessary to have a balancing tank in order to prevent shock load for bio-treatment system.

Anoxic treatment tank: Eliminating NO3, anoxic micro-organisms using nitrate (NO-3) instead of oxygen. Therefore, it is necessary to reflux water containing nitrate. To enhance the treatment efficiency, the tank is designed to be attached by a submerged mixer. This tank can be removed if the customer does not have enough space and footprint for the system.

Aerobic & MBR: This is the central treatment compartment of system before the effluent is drained out. Very high density micro-organisms and sticking to a surface membrane will completely remove pollutants such as Ammonia NH4, part of BOD, Nitrate. Meanwhile, this membrane shall filter the untreated components due to overloading to circulate through the reflux pump for thoroughly treating the wastewater.

One feature of domestic wastewater is ~ 48% inorganic, non-biodegradable, and not all organic substances will be decomposed by microorganisms, therefore, the membrane shall play a very important role in removing most of these substances together with sludge, including coliforms, to ensure that the outlet water meets A standard or above in a stable manner, without the addition of sterilization chemicals to treat coliforms.

Sludge storage tank: To store excess sludge generated during the treatment process, partially drying the sludge prior to the transportation for treatment in the form of solid or liquid disposal.

4. Does NGO use any different MBR technology?

Yes, NGO use MBR-X membranes with 3D material structure, the water distribution structure follows 6 ports (instead of 1 port as most common membranes available in the market); Transmembrane pressure is particularly low, can be the lowest among membrane technologies in the market; The frequency of membrane cleaning is very low (~ once a month) with only 0.5% NaCLO solution, which can be easily and washed inside the treatment tank and much more convenient for operators. This is the technology that has 7 patents and has been applied in more than 300 projects all over the world.

5. Is the maintenance of the wastewater treatment system expensive?

Enterprises only spend less than VND 2,000/ m3 to maintain the wastewater treatment system with MBR technology

6. What is the quality of after-treatment water committed by NGO’s?

NGO has the ability to commit to after-treatment water meeting quality standard by inheriting technology from strategic cooperation with manufacturers and the experience accumulated through hundreds of MBR projects implemented. We will support enterprises to monitor their water quality daily publicly and independently to ensure water quality as committed.

Pollution concentration of domestic wastewater and water quality achieved and stabilized after treatment at one project of NGO.

If your business is interested in solution to inlet water treatment, or has a demand for ion exchange materials, please contact NGO via phone number (024) 3566 8225 or email office@8ngo.com for direct consultation.