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Acrylon production waste water treatment method

A treatment method and technology for producing wastewater, which is applied in textile industry wastewater treatment, biological water/sewage treatment, sustainable biological treatment, etc., can solve the problems of long wastewater treatment process, disintegration, and high investment, and achieve the improvement of microbial activity and wastewater Effect of treatment, improvement of technical route, and effect of shortening the treatment process

Active Publication Date: 2012-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 contained in acrylic fiber production wastewater - , acetonitrile, acrylonitrile, sodium thiocyanate, especially dimethylformamide (DMF), diethylenetriaminepentaacetic acid (DTPA) in the production wastewater of dry spinning with dimethylformamide as solvent ), tetrasodium ethylenediaminetetraacetic acid (EDTA) and other substances, all of which can chelate with metal ions in wastewater (including in organisms), seriously affecting the activity of biological enzymes, resulting in a decline in the effect of biochemical treatment and system operation. Unstable, poor adaptability to the impact of water quality fluctuations, and due to poor self-aggregation of microorganisms, small bacterial gelatinous groups, easy poisoning, death, and disintegration, 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]An acrylic fiber factory adopts a one-step wet spinning process of polymerization and spinning in sodium thiocyanate solution phase and a two-step wet spinning process of suspension polymerization in water phase and spinning in sodium thiocyanate solvent to produce acrylic fiber , The comprehensive wastewater discharged from production is treated by the following methods.

[0034] The production wastewater of each unit first enters the mixing and homogenizing tank for homogenization, and then enters the sedimentation tank to remove suspended solids. The hydraulic retention time of the mixing and homogenizing tank is 24 hours, the hydraulic retention time of the sedimentation tank is 2 hours, and the surface load is 0.2m 3 / m 2 .h; the wastewater after homogeneous precipitation enters the pH adjustment tank, and the pH of the wastewater is adjusted to 7 to 8.5 with 5% sodium hydroxide aqueous solution; the wastewater after pH adjustment is sent to the biochemical treatmen...

Embodiment 2

[0041] An acrylic fiber factory adopts the two-step wet spinning process of aqueous phase suspension polymerization and spinning in sodium thiocyanate solvent to produce acrylic fiber, and the comprehensive wastewater discharged during production is treated by the process method of Example 1.

[0042] Process operation parameters In addition to the addition of polyaluminum chloride 150mg / L and polyacrylamide addition of 12mg / L in flocculation, the addition of ferric chloride, magnesium chloride and calcium chloride aqueous solution is: iron ion 120mg / L, magnesium ion 250mg / L L, calcium ion 50mg / L, the water conservancy retention time of the biochemical treatment pond is 20h, other is identical with embodiment 1. See Table 3 for the processing results.

[0043] table 3

[0044] serial number

[0045] Flocculation effluent

[0046] The appearance of the effluent in the table is colorless and transparent, with a pH of 6-8. (The units of test items in the ...

Embodiment 3

[0048] An acrylic fiber factory adopts the two-step dry spinning process of aqueous phase suspension polymerization and spinning in dimethylformamide (DMF) solvent to produce acrylic fiber, and the comprehensive wastewater discharged in the production is processed by the process method of Example 1.

[0049] Process operation parameters In addition to adding 200mg / L of polyaluminum chloride and 15mg / L of polyacrylamide in flocculation, the addition of iron sulfate, magnesium sulfate and calcium chloride aqueous solution is: iron ion 150mg / L, magnesium ion 300mg / L L, calcium ion 60mg / L, the water conservancy retention time of the biochemical treatment pool is 24h, other is identical with embodiment 1. See Table 4 for the processing results.

[0050] Table 4

[0051] serial number

[0052]

[0053] The appearance of the effluent in the table is colorless and transparent, with a pH of 6-8. (The units of test items in the table are mg / L)

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/12C02F1/52C02F103/30
CPCY02W10/10
Inventor 高明华王道泉刘辉赵璞刘莉
Owner CHINA PETROLEUM & CHEM CORP
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