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Polyacrylamide for chemical fiber

Chemical fiber manufacturing plants produce various types of waste water during their production process, such as PET waste water, PTA waste water, cotton pulp black liquor, viscose waste water, etc. Chemical fiber wastewater characteristics: complex composition and strong acidity and alkalinity; Polyacrylamide for chemical fiber.



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High content of cellulose, hemicellulose, alcohols, pectin, etc., as well as various toxic substances. For example, the main pollutants in PET wastewater are ethylene glycol, ethylene glycol, terephthalic acid and their intermediate products and oligomers. PTA wastewater mainly contains phthalic acid, p-xylene, benzoic acid, methyl acetate, acetic acid and other pollutants; polyester wastewater contains PTA, acetaldehyde, EG, diethylene glycol, triethylene glycol, spinning oil Pollutants such as agents.

Chemical fiber wastewater contains high organic matter content, various toxic substances, high B/C and unstable, between 1000-10000mg/1, wastewater treatment has poor biodegradability, wastewater is acidic or destructive, and contains aldehydes and cyanide Toxic substances such as benzene, benzene, etc., are likely to have toxic effects on microorganisms. Common treatment methods for chemical fiber wastewater

Waste water → grille → homogenization tank → neutralization tank → pretreatment tank → biological treatment unit → advanced treatment → effluent discharge. Since chemical fiber wastewater is acidic or alkaline, it must be neutralized before treatment to make the pH neutral Within range. Generally, acidic wastewater is neutralized by adding alkali, and alkaline wastewater is neutralized by adding acid. Where conditions permit, acid-base wastewater can also be used for neutralization. After pH adjustment, the wastewater needs to be pretreated to remove SS and oily substances, such as using air flotation to remove oil, coagulation and sedimentation to remove suspended solids and some organic substances. The pretreatment process can improve the biodegradability of wastewater. The pretreated wastewater enters the biological treatment unit, and most of the organic matter and other pollutants are effectively removed. In order to make the effluent reach higher standards or reuse requirements, advanced treatment is required, such as activated carbon adsorption, sand filtration, biochar pool, etc.

Chemical fiber wastewater biological treatment method, the domestic biological treatment of chemical fiber wastewater, mainly adopts A/O process, using activated sludge method, biofilm method, or mixed application of the two methods. The anaerobic-aerobic treatment process can give full play to the anti-impact load capacity of anaerobic microorganisms and improve the biodegradability of sewage. It also uses the characteristics of rapid growth of aerobic microorganisms, good effluent quality and low operating costs. It is used in organic wastewater treatment. Widely used. For example, if the UASB-hydrolysis acidification-contact oxidation-MBR process is used to treat PET wastewater with a COD concentration of 30,000 mg/L in a chemical fiber plant, the final COD of the effluent can reach below 100 mg/L, and all indicators have reached the ``Integrated Wastewater Discharge Standard "The first-level standard. There are engineering cases using anaerobic + two-stage aerobic + biological charcoal treatment to treat high-concentration chemical fiber wastewater with a COD of 560omg/L, and the effluent COD can reach below 50mg/L.

In conclusion, the methods and methods of chemical fiber manufacturing wastewater treatment also depend on the specific conditions of each plant.

Polyacrylamide for chemical fiber wastewater treatment. In the chemical fiber production process, chemical fiber production plants will produce various waste water, such as PET waste water, PTA waste water, cotton pulp black liquor, viscose waste water, etc. Chemical fiber wastewater has complex components, often containing strong acids, strong alkalis, cellulose, hemicellulose, alcohols, pectins, etc., as well as various toxic substances. For example, the main pollutants in PET wastewater are ethylene glycol, p-benzene Dicarboxylic acid and its intermediate products and oligomers; PTA wastewater mainly contains phthalic acid, p-xylene, benzoic acid, methyl acetate, acetic acid and other pollutants; polyester wastewater contains PTA, acetaldehyde, EG, diethylene glycol Pollutants such as alcohol, triethylene glycol, spinning oil. Polyacrylamide for chemical fiber.

Since chemical fiber wastewater is acidic or alkaline, it must be neutralized before treatment to make its pH in the neutral range. Generally, acidic wastewater is neutralized by adding alkali, and alkaline wastewater is neutralized by adding acid. Where conditions permit, acid-base wastewater can also be used for neutralization. After pH adjustment, the wastewater needs to be pretreated to remove SS and oily substances, such as using air flotation to remove oil, coagulation and sedimentation to remove suspended solids and some organic substances. The pretreatment process can improve the biodegradability of wastewater. The pretreated wastewater enters the biological treatment unit, and most of the organic matter and other pollutants are effectively removed. In order to make the effluent reach higher standards or reuse requirements, advanced treatment is required, such as activated carbon adsorption, sand filtration, biochar pool, etc.

Polyacrylamide is used in the treatment of chemical fiber wastewater. The main function of polyacrylamide is to accelerate the sedimentation speed of suspended solids and reduce various indicators in sewage (COD, ammonia nitrogen, SS, turbidity, etc.). The applicability of polyacrylamide requires a small trial selection to select a polyacrylamide model suitable for chemical fibers. Guangdong Shouxin Environmental Protection Materials Technology Co., Ltd. is a professional company in this field, focusing on polyacrylamide selection for more than ten years.


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