Composite high polymer flocculant for coking wastewater and preparation method thereof

A technology of polymer flocculant and coking wastewater, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effects of less secondary pollution, less water content, and longer molecular chains

Inactive Publication Date: 2017-01-18
TIANJIN ZHONGFU ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical shortcomings of existing various flocculants, and to provide a high-efficiency, cheap, biodegradable composite polymer flocculant and its preparation method for coking wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example example 1

[0014] Example Example 1: Weigh a certain amount of cationic starch aqueous solution with a mass fraction of 40%, heat it to 75 ° C, gelatinize for 0.4 h, cool down to 35 ° C, and then add acrylamide monomer that accounts for 30% of the mass fraction of the cationic starch aqueous solution. , the initiator ceric ammonium nitrate with a mass fraction of 0.003%, at a temperature of 40 ° C, after the reaction for 0.8 h, cooled to room temperature, precipitated and washed the initial product with ethanol, and then filtered with a Buchner funnel. The cationic starch-polyacrylamide graft copolymer was obtained after vacuum drying at 60°C. Then, an aqueous solution of cationic starch-polyacrylamide graft copolymer with a mass fraction of 2% was prepared, and 0.2% of polymerized ferric sulfate and 0.2% of polymerized ferric chloride were added. After fully stirring, a composite type was obtained. Polymer flocculants. When 1000ml of coking wastewater was treated with 5ml of composite ...

example example 2

[0015] Example Example 2: Weigh a certain amount of anionic starch aqueous solution with a mass fraction of 45%, heat it to 80 ° C, gelatinize for 0.4 h, cool down to 40 ° C, and then add acrylic acid monomer that accounts for 30% of the mass fraction of the cationic starch aqueous solution, The initiator potassium persulfate with a mass fraction of 0.005% was reacted at 50 °C for 1 h, cooled to room temperature, precipitated with ethanol and washed the initial product, and then filtered with a Buchner funnel and washed 3 times. After vacuum drying at 60°C, anionic starch-polyacrylic acid graft copolymer was obtained. Then, an aqueous solution of anionic starch-polyacrylic acid graft copolymer with a mass fraction of 3% was prepared, and 0.1% of polymerized iron sulfate and 0.4% of polymerized iron silicate were added. Molecular flocculants. The 7ml composite polymer flocculant prepared above was used to treat 1000ml of coking wastewater, and the COD removal rate in the cokin...

example example 3

[0016] Example 3: Weigh a certain amount of amphoteric starch aqueous solution with a mass fraction of 50%, heat it to 80 ° C, gelatinize for 0.6 h, cool down to 45 ° C, and then add methylene propylene accounting for 30% of the mass fraction of the cationic starch aqueous solution Amide monomer, ammonium persulfate initiator with mass fraction of 0.006%, reacted at 60 °C for 1.5 hours, cooled to room temperature, precipitated and washed the initial product with ethanol, then filtered with a Buchner funnel and washed 4 times repeatedly , the precipitate was vacuum dried at 65°C to obtain cationic starch-polyacrylamide graft copolymer. Then prepare an aqueous solution of amphoteric starch-polymethylene acrylamide graft copolymer with a mass fraction of 3%, add 0.1% polymer ferrous sulfate and 0.4% polymer ferrous chloride, and stir well. Then, a composite polymer flocculant is obtained. The 10ml composite polymer flocculant prepared above was used to treat 1000ml of coking was...

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Abstract

The invention discloses a composite high polymer flocculant for coking wastewater and a preparation method thereof. The composite high polymer flocculant adopts non-ionic modified starch, cationic modified starch, anionic modified starch, and amphoteric modified starch as the raw materials, in the presence of an initiator and under a weak acid condition, the raw materials undergo graft copolymerization with acrylamide, acrylic acid, methacrylic acid, acrylonitrile, acrylic ester, styrene, methylene acrylamide, maleic anhydride and other monomers to obtain a modified starch graft copolymer, and the copolymer is blended with an inorganic flocculant ferric sulfate, ferric silicate, ferric chloride, ferrous sulfate and ferrous chloride to obtain the composite high polymer flocculant. The composite high polymer flocculant has the characteristics of long molecular chain, compact floccules, wide source of raw materials, low price, biodegradability, and little secondary pollution, etc., and is a real efficient and environment-friendly flocculant. During use, the dosage of the composite high polymer flocculant accounts for 0.1-1% of the volume fraction of the treated coking wastewater, the COD removal rate of the treated coking wastewater reaches 85% or more, the decolorization rate is 95% or more, and the removal rate of suspended solids reaches 95% or more.

Description

technical field [0001] The invention relates to a composite polymer flocculant for treating coking wastewater and a preparation method thereof, as well as the application of the flocculant in coking wastewater, belonging to the technical field of flocculants for environmental protection water treatment. Background technique [0002] At present, the flocculants for coking wastewater at home and abroad are mainly divided into two categories: inorganic flocculants and organic flocculants. Inorganic flocculants are mainly polyaluminum and polyiron, including polyaluminum silicate, polyaluminum sulfate, polyaluminum chloride, polyferric silicate, polyferric sulfate, polyferric chloride, etc. Fast and widely used. However, because polyaluminum flocculants contain a large amount of aluminum ions, the residual degree of aluminum ions in the treated water is high. Once discharged to the outside world, it will cause secondary pollution, especially if it enters the human body, it can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F1/52C08F251/00C08F220/56C08F220/06C08F220/54
Inventor 陈德辉刘晨迪建东
Owner TIANJIN ZHONGFU ENG TECH
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