Wastewater treatment in the paper industry
Paper industry is growing rapidly and contributing to the overall development process of social economy. Parallel to the development of the paper industry is a requirement set out very important that all the projects on paper has been prepared to invest to ensure environmental requirements.
Recently, public concern, worry the company Lee & Man Paper Ltd. Vietnam is about to put the production line paper capacity of the largest-ever operation in Vietnam. Then the wastewater treatment process of Lee & Man Vietnam must comply with the regulations like?
Recently, public concern, worry the company Lee & Man Paper Ltd. Vietnam is about to put the production line paper capacity of the largest-ever operation in Vietnam. Then the wastewater treatment process of Lee & Man Vietnam must comply with the regulations like?
First, it is the provisions of the law, according to which, all organizations and individuals related to the operation of industrial wastewater discharge paper and pulp wastewater into receiving sources must comply with the provisions in NTR 12- MT: 2015 / MONRE - National technical Regulation on waste paper and pulp industry (National standards). Which specifies the maximum allowed value of the total pollution in industrial waste water being discharged pulp and paper effluent into the receiving water for water supply purposes (A) and being discharged supplies receives wastewater not used for drinking water supply (B). It specifies eight parameters, which parameters are applicable from 01.01.2018 Dioxin. Currently, the advanced production line from 10-15 m3 of water used for the production of 1 ton of paper. This water must be treated to meet national regulations before being discharged into the receiving water.
First, the waste water from the production process and the activities to be pre-treated to remove all the trifles can cause problems in the operation of wastewater treatment systems. Waste water is passed through a sieve system to retain solids size, garbage and focus on the sewage tank. Since this system was put into wastewater treatment: physico-chemical treatment (level I) and biochemical processing.
First, the waste water from the production process and the activities to be pre-treated to remove all the trifles can cause problems in the operation of wastewater treatment systems. Waste water is passed through a sieve system to retain solids size, garbage and focus on the sewage tank. Since this system was put into wastewater treatment: physico-chemical treatment (level I) and biochemical processing.
Here wastewater is filtered fibers, heavy metal removal and suspensions. Then, from the collection tank, water pump system pushed tilted sieve is recovered most of fibers present in sewage. Filtered wastewater fiber mixing tank fell.
In the mixing tank (fast, slow) a chemical PAC (poly-alumium chloride) and PAM (high-molecular compounds dissolved in water) is put into the tank to precipitate the suspended solids and other metal ions in wastewater.
At first sedimentation tanks, sewage from mixing tank is pumped into the first sedimentation tank. There, the precipitate settled to the bottom, the remaining water conditioning switched to an adjustment (treatment system also has to deal with an incident in the event of an emergency).
Air tank, Air work flow to maintain the effluent in almost constant for the next stage, to overcome operational problems due to fluctuations caused wastewater flow and improve the performance of at the end of the processing chain. From the pool water conditioning filter out the majority of suspended solids, was transferred to the cooling tower.
In cooling towers, waste water temperature is reduced to room temperature in accordance with the following process steps (from 50 ° C to 35 ° C). Cooling water tank switch to adjust the pH for anaerobic treatment process.
Here the waste water is treated by biological methods - biochemical oxidation process, based on active use of microorganisms to decompose organic matter in the wastewater contamination. To ensure the treated waste water can discharge wastewater receiving water for item A, handling systems often use both methods as anaerobic and aerobic. Using anaerobic microorganisms oxygen, anaerobic reactions have the effect of eliminating the organic matter in wastewater to reduce COD. The latest technology is now EGSB (mud treatment system expanded particles) or IC (internal circulation tower). In the process of decomposition of pollutants forming gas containing methane (which can be used for combustion in boilers after filtering) and a small amount of sludge than aerobic method. Water was anaerobic biological treatment is put into aerobic biological treatment
Aerobic biological treatment (to maintain continuous supply of oxygen and the temperature at 35 ° C - 40 ° C). Aeration tank always contains aerobic bacteria. The process of aerobic biological treatment is usually conducted twice has the effect of eliminating the organic matter in the water to reduce the COD.
To the proliferation of microorganisms to provide nutrients such as phosphorus and mixtures of nitrogen and oxygen in the waste water, and temperature controlled water and oxygen dissolved in water. The use of membrane methods to ensure adequate supply of dissolved oxygen to the bacteria, increase the ability to absorb organic matter microbial ensure maximum resolution. As a result, the formation of biological cotton can settle under gravity. For most microorganisms optimum pH value of about 6.8 to 7.2, while while maintaining the pH in wastewater after anaerobic treatment of about 6.8 to 7.2 6 , from 8 to 7.5. Waste water temperature greatly influenced the function of microbial activity. For most microorganisms, waste water temperature of 35 ° C to - 38 ° C. After the first aerobic treatment, the water is transferred to the intermediate clarifier, where the precipitate is settled down and discharged into the sludge collection tank. From there continue to be processed water aerobic second, intermediate clarifiers and Monday, before being discharged into the receiving water body used for wastewater A.
Currently most of the largest paper production line in Vietnam have wastewater treatment systems in accordance with the advanced equipment on the company's wastewater treatment leading (American and European) as Saigon Paper Corporation (My Xuan A industrial Zone, Ba Ria - Vung Tau), An Binh Paper Corporation (Anping, Di An, Binh Duong), workshops GiayChanh Ocean Co. (US industrial Park Phuoc, Ben Cat district, Binh Duong), Vina Kraft Paper company Limited (My Phuoc 3 industrial Park, Ben Cat district, Binh Duong) ...
In recent years, the paper industry Vietnam now actively investing in upgrading production equipment not only investment but also improve and upgrade the wastewater treatment system, exhaust. They are constantly improving technology, improve management to reduce the consumption of resources: water, energy and labor to reduce costs of production and sustainable development. Reducing the amount of water used to produce 1 ton of paper, reduce the pollution parameters of waste water and paper businesses not only help protect the environment but also reduce environmental fees paid by volume of wastewater and under values of pollution parameters.
In the mixing tank (fast, slow) a chemical PAC (poly-alumium chloride) and PAM (high-molecular compounds dissolved in water) is put into the tank to precipitate the suspended solids and other metal ions in wastewater.
At first sedimentation tanks, sewage from mixing tank is pumped into the first sedimentation tank. There, the precipitate settled to the bottom, the remaining water conditioning switched to an adjustment (treatment system also has to deal with an incident in the event of an emergency).
Air tank, Air work flow to maintain the effluent in almost constant for the next stage, to overcome operational problems due to fluctuations caused wastewater flow and improve the performance of at the end of the processing chain. From the pool water conditioning filter out the majority of suspended solids, was transferred to the cooling tower.
In cooling towers, waste water temperature is reduced to room temperature in accordance with the following process steps (from 50 ° C to 35 ° C). Cooling water tank switch to adjust the pH for anaerobic treatment process.
Here the waste water is treated by biological methods - biochemical oxidation process, based on active use of microorganisms to decompose organic matter in the wastewater contamination. To ensure the treated waste water can discharge wastewater receiving water for item A, handling systems often use both methods as anaerobic and aerobic. Using anaerobic microorganisms oxygen, anaerobic reactions have the effect of eliminating the organic matter in wastewater to reduce COD. The latest technology is now EGSB (mud treatment system expanded particles) or IC (internal circulation tower). In the process of decomposition of pollutants forming gas containing methane (which can be used for combustion in boilers after filtering) and a small amount of sludge than aerobic method. Water was anaerobic biological treatment is put into aerobic biological treatment
Aerobic biological treatment (to maintain continuous supply of oxygen and the temperature at 35 ° C - 40 ° C). Aeration tank always contains aerobic bacteria. The process of aerobic biological treatment is usually conducted twice has the effect of eliminating the organic matter in the water to reduce the COD.
To the proliferation of microorganisms to provide nutrients such as phosphorus and mixtures of nitrogen and oxygen in the waste water, and temperature controlled water and oxygen dissolved in water. The use of membrane methods to ensure adequate supply of dissolved oxygen to the bacteria, increase the ability to absorb organic matter microbial ensure maximum resolution. As a result, the formation of biological cotton can settle under gravity. For most microorganisms optimum pH value of about 6.8 to 7.2, while while maintaining the pH in wastewater after anaerobic treatment of about 6.8 to 7.2 6 , from 8 to 7.5. Waste water temperature greatly influenced the function of microbial activity. For most microorganisms, waste water temperature of 35 ° C to - 38 ° C. After the first aerobic treatment, the water is transferred to the intermediate clarifier, where the precipitate is settled down and discharged into the sludge collection tank. From there continue to be processed water aerobic second, intermediate clarifiers and Monday, before being discharged into the receiving water body used for wastewater A.
Currently most of the largest paper production line in Vietnam have wastewater treatment systems in accordance with the advanced equipment on the company's wastewater treatment leading (American and European) as Saigon Paper Corporation (My Xuan A industrial Zone, Ba Ria - Vung Tau), An Binh Paper Corporation (Anping, Di An, Binh Duong), workshops GiayChanh Ocean Co. (US industrial Park Phuoc, Ben Cat district, Binh Duong), Vina Kraft Paper company Limited (My Phuoc 3 industrial Park, Ben Cat district, Binh Duong) ...
In recent years, the paper industry Vietnam now actively investing in upgrading production equipment not only investment but also improve and upgrade the wastewater treatment system, exhaust. They are constantly improving technology, improve management to reduce the consumption of resources: water, energy and labor to reduce costs of production and sustainable development. Reducing the amount of water used to produce 1 ton of paper, reduce the pollution parameters of waste water and paper businesses not only help protect the environment but also reduce environmental fees paid by volume of wastewater and under values of pollution parameters.
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