Acrylon production waste water treatment method

Abstract

The method discloses a method for treating wastewater generated during the production of acrylic fibers. The method is to treat comprehensive wastewater generated during the production of acrylic fibers taking acrylonitrile as a first monomer by steps of uniform settlement, pH value adjustment, aerobic biochemical treatment and flocculation precipitation. The method adds iron ions, magnesian ion, calcium ion and other metallic ions during the biochemical treatment to react the ions with cyanogens, nitrile, amine and other substances in the wastewater to form chelate complexs, thereby preventing the substances form damaging enzymes of microorganisms, solving the problem of chelating poisoning of microorganisms during water treatment, improving activities of microorganisms and wastewater treatment effect, shortening treatment process, reducing treatment cost and having the characteristics of simpleness, practicality, stable treatment effect, high removal efficiency and wide application range, etc.

Description

technical field [0001] The invention relates to a method for treating industrial waste water, in particular to a method for treating comprehensive waste water produced in the process of producing acrylic fiber with acrylonitrile as the first monomer. Background technique [0002] At present, acrylonitrile is generally used as the first monomer, and vinyl compounds with ester groups (-COOR) such as methyl acrylate (MA), methyl methacrylate (MMA), and vinyl acetate (VA) are used as the second monomer. Two monomers, with compounds containing sulfonic acid or carboxylic acid groups as the third monomer, such as sodium ethylene sulfonate, sodium propylene sulfonate, sodium styrene sulfonate, sodium methacrylene sulfonate, p-methacrylamide Sodium benzenesulfonate, methylene succinic acid (itaconic acid) methacrylic acid, etc., are polymerized in sodium thiocyanate solution by using reaction monomers, and the polymerization solution is directly spun (called one-step method), or rea...

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Problems solved by technology

[0010] 1. Only focus on improving the treatment effect of soluble low-molecular polymers that are difficult to biodegrade in wastewater, without targeted removal of compounds that are toxic and inhibitory to microorganisms in wastewater, resulting in a decline in the treatment effect of wastewater

[0011] In the process of biochemical treatment of wastewater, many biological enzymes that degrade pollutants rely on the presence of various metals to complete their exclusive catalytic decomposition functions. Metals are the active centers of cofactor enzymes. Once metal ions exist in wastewater If it is destroyed, the biological activity of microorganisms will be greatly reduced until the activity is lost, which will directly lead to the decline of wastewater treatment effect

[0012] CN-, acetonitrile, acrylonitrile, sodium thiocyanate contained in acrylic fiber production wastewater, especially the production wastewater of dry spinning with dimethylformamide as solvent contains dimethylformamide (DMF), diethylene Ethyltriaminepentaacetic acid (DTPA), tetrasodium ethylenediaminetetraacetic acid (EDTA) and other substances, all of which can chelate with metal ions in wastewater (including living organisms), seriously affect the activity of biological enzymes, resulting in The effect of biochemical treatment is reduced, the system is unstable, and the adaptability to the impact of water quality fluctuations is poor. Due to the poor self-aggregation of microorganisms and small bacterial gelatinous groups, they are easy to poison and die and disintegrate, resulting in high suspended matter content and dark color in biochemical effluent.

[0013] 2. Due to the low efficiency of microbial degradation of pollutants, the process of wastewater treatment is long, the investment is high, the area is large, and the treatment cost is high, especially for the removal of COD and NH 3 -N needs to be done in steps

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