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Chitosan environmental-protection flocculant, preparation method and applications thereof

The technology of flocculant and chitosan is applied in the field of chitosan type environmental protection flocculant and its preparation, which can solve the problems of operator and surrounding environment hazards, paint cannot be handled well, and has no biodegradability, etc. Achieve the effect of reducing secondary pollution, solving the problem of water deterioration and odor, and improving water quality and odor.

Active Publication Date: 2016-02-03
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 the water system, causing secondary pollution of the water body.
Domestic Zhu Lizhong, Li Zhi and others have also done 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. , but 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
Painting wastewater contains pollutants such as resins, surfactants, heavy metal ions, oil, paint thinners, organic solvents, etc., and has a high COD value. If not handled properly, it will cause serious pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 387.6g of deionized water and add it to the Erlenmeyer flask, heat to 80°C for stirring, then add 4g of glacial acetic acid and 4g of modified chitosan for stirring, stir for one hour at a speed of 500r / min, and wait until it is fully After dissolving, add 0.4g of sodium hydroxide and 4g of rectorite to the Erlenmeyer flask to fully stir, and after fully stirring for 3 hours, cool down to room temperature to obtain an environmentally friendly flocculant. The removal rate of COD can reach 80%, and the agglomeration of paint slag is large, the water content of paint slag is low, and the removal rate of heavy metal ions in circulating water is 98.2%.

Embodiment 2

[0025] Take by weighing 384.8g deionized water and join in the Erlenmeyer flask, be heated to 80 ℃ and stir, then add glacial acetic acid 4.8g and modified chitosan 4.8g and stir, stir at the speed of 500r / min for one hour, wait After it is fully dissolved, add 0.8g of sodium hydroxide and 4.8g of rectorite to the Erlenmeyer flask to fully stir, and after fully stirring for 3 hours, cool down to room temperature to obtain an environmentally friendly flocculant. The COD removal rate of the circulating water in the workshop can reach 82%, and the paint slag has large agglomerates and low moisture content, and the removal rate of heavy metal ions in the circulating water is 98.0%.

Embodiment 3

[0027] Weigh 380.8g of deionized water and add it to the Erlenmeyer flask, heat to 80°C and stir, then add 6g of glacial acetic acid and 6g of modified chitosan to stir, stir for one hour at a speed of 500r / min, and wait until fully After dissolving, add 1.2g of sodium hydroxide and 6g of rectorite to the Erlenmeyer flask to fully stir, and after fully stirring for 3 hours, cool down to room temperature to obtain an environmentally friendly flocculant. The removal rate of COD can reach 84%, and the agglomeration of paint slag is large, the water content of paint slag is low, and the removal rate of heavy metal ions in circulating water is 98.8%.

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PUM

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Abstract

The present invention discloses a chitosan environmental-protection flocculant, a preparation method and applications thereof. The chitosan environmental-protection flocculant comprises, by mass, 1-3% of modified chitosan, 0.1-0.5% of sodium hydroxide, 1-3% of rectorite, 1-3% of glacial acetic acid, and 90.5-96.9% of water, wherein the modified chitosan is prepared from a reaction of 2,3-epoxypropyltrimethylammonium chloride, trisodium trithiocyanate and chitosan, the molecular weight range of the chitosan is 100000-300000, and the deacetylation degree is more than or equal to 80%. According to the present invention, the flocculant product adopting the modified chitosan as the main raw material, and the 2,3-epoxypropyltrimethylammonium chloride and the trisodium trithiocyanate are concurrently adopted to modify the chitosan, such that the modified chitosan has the bacterial killing and bacterial inhibiting effect, and further provides the good adsorption effect for heavy metals in circulating water; and the chitosan environmental-protection flocculant is the naturally-biodegradable, secondary-environment-pollution-free, and environmental protection flocculant.

Description

technical field [0001] The invention relates to the technical field of environmentally friendly flocculants, in particular to a chitosan-based environmentally friendly flocculant 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 aromati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
Inventor 许海谢爱军高素萍贾海武张大同
Owner 上海昌韶环境科技有限公司
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