Environment-friendly flocculating agent for lowering COD and preparation method and application thereof

A flocculant, environmental protection technology, applied in the field of environmental protection flocculant and its preparation to reduce COD, can solve the problems of operators and surrounding environment hazards, paint can not be handled well, not biodegradable, etc., to achieve reduction Secondary pollution, good flocculation effect, water content improvement effect

Active Publication Date: 2016-01-20
上海昌韶环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this product is synthesized by chemical action and is not biodegradable. It is easy to produce a large amount of COD and BOD when used to treat water systems, causing secondary pollution of water bodies.
Domestic Zhu Lizhong, Li Zhi and others also did research on the application of aldehyde-amine condensation products and aromatic amine-aldehyde condensation products as water treatment agents in the 1990s. Although these agents have relatively high activity on paints, they are This type of product volatilizes toxic gas during production and use, causing great harm to the operator and the surrounding environment
In addition, in the water treatment of the coating industry, paint mist coagulants such as organic and inorganic polymer compound types and strong alkali dispersion types have also been used in large quantities. However, these pharmaceutical products cause serious secondary pollution to water bodies and are less viscous. The strong paint still can't be handled very well, and it can't meet the requirements of the rising paint industry to use a variety of paints to lose viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 320g of deionized water and add it to the Erlenmeyer flask, heat to 80°C and stir, then add 20g of cationic starch (the cationic starch is a quaternary ammonium starch ether and the degree of substitution is 0.07) and stir, at a speed of 400r / min Stir for one hour, after it fully dissolves, add 12g glacial acetic acid and 12g chitosan (this chitosan molecular weight is 600,000 and deacetylation degree is 87.3%) to stir in Erlenmeyer flask again, stirs one hour, wait for its After fully dissolving, add 20g of sodium chloride, 20g of sepiolite and 4g of organically modified rectorite (specifically KH550 organically modified rectorite) in the Erlenmeyer flask to fully stir, and then cool to room temperature after stirring for 3 hours That is to say, an environment-friendly flocculant for reducing COD can be obtained. The COD removal rate of the circulating water in the painting workshop can reach 90%, and the paint slag has a large agglomerate and a low water content ...

Embodiment 2

[0023] Weigh 330g of deionized water and add it to the Erlenmeyer flask, heat to 80°C and stir, then add 20g of cationic starch (quaternary ammonium starch ether and the degree of substitution is 0.07) and stir, and stir for one hour at a speed of 400r / min. After it is fully dissolved, add 12g glacial acetic acid and 12g chitosan (molecular weight is 600,000 and the degree of deacetylation is 87.3%) to stir in Erlenmeyer flask again, stir one hour, after it fully dissolves, add again to Erlenmeyer flask Add 12g of sodium chloride, 12g of sepiolite and 2g of KH550 organically modified rectorite to the mixture and stir thoroughly. After stirring for 3 hours, cool down to room temperature to obtain an environmentally friendly flocculant that reduces COD. This environmentally friendly flocculant is beneficial to the coating workshop The COD removal rate of the circulating water can reach 87%, and the paint slag has a large agglomerate and the water content of the paint slag is low....

Embodiment 3

[0025] Weigh 340g of deionized water and add it to the Erlenmeyer flask, heat to 80°C and stir, then add 16g of cationic starch (quaternary ammonium starch ether and the degree of substitution is 0.07) and stir, and stir for one hour at a speed of 400r / min. After it is fully dissolved, add 10g glacial acetic acid and 10g chitosan (molecular weight is 600,000 and the degree of deacetylation is 87.3%) to stir in Erlenmeyer flask again, stir one hour, after it fully dissolves, add again to Erlenmeyer flask Add 10g of sodium chloride, 10g of sepiolite and 4g of KH550 organically modified rectorite to the mixture and stir thoroughly. After stirring for 3 hours, cool down to room temperature to obtain an environmentally friendly flocculant that reduces COD. This environmentally friendly flocculant is beneficial to the coating workshop The COD removal rate of the circulating water can reach 86%, and the paint slag has a large agglomerate and the water content of the paint slag is low....

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Abstract

The invention discloses an environment-friendly flocculating agent for lowering the COD and a preparation method and application thereof. The environment-friendly flocculating agent is prepared from, by mass, 1%-5% of cationic starch, 1%-3% of chitosan, 1%-3% of sepiolite, 1%-5% of sodium chloride, 0.2%-1% of rectorite, 1%-3% of glacial acetic acid and 80%-94.8% of water. The preparation method comprises the steps that the water is added into a reactor, heated and stirred; the cationic starch is added into the reactor, the glacial acetic acid and the chitosan are added when the starch is completely dissolved, the sodium chloride, the sepiolite and the rectorite are added when the chitosan is completely dissolved, fully stirring is performed, when the materials are completely dissolved, the mixed liquid is cooled to the room temperature, and then the environment-friendly flocculating agent is prepared. The environment-friendly flocculating agent is natural, degradable and friendly to environment and cannot cause secondary pollution; paint slag agglomeration can be improved, the paint slag water content can be increased, and the COD removing rate of painting workshop circulating water is about 90 percent.

Description

technical field [0001] The invention relates to the technical field of environmentally friendly flocculants, in particular to an environmentally friendly flocculant for reducing COD and its preparation method and application. Background technique [0002] U.S. Patent "Painting Room Water System Treatment Formula and Its Application Method", patent number: 0245181, this patented product has the advantages of making the paint lose viscosity and flocculation, and can also treat water-based paint. new product. It is composed of solid organic polymer water dispersion and surfactants, bactericides, thickeners, clarifiers and other additives. However, this product is synthesized by chemical action and is not biodegradable. It is easy to produce a large amount of COD and BOD when used to treat the water system, causing secondary pollution of the water body. Domestic Zhu Lizhong, Li Zhi and others also did research on the application of aldehyde-amine condensation products and arom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F1/54C02F1/28
Inventor 许海谢爱军高素萍沙锦尤国彪
Owner 上海昌韶环境科技有限公司
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