Method for treating papermaking wastewater by nano chitosan composition flocculation system

A nano-chitosan, papermaking wastewater technology, applied in the direction of flocculation/sedimentation water/sewage treatment, processing wastewater treatment, etc., can solve the problem of not being able to truly display the full picture of biological activity, chemical structure and performance characteristics, and improve the flocculation effect. , Reduce the processing cost, the application effect is good

Inactive Publication Date: 2012-05-23
广汉恒宇新材料有限公司
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AI Technical Summary

Problems solved by technology

[0005] At present, the application of chitin and its derivatives in the paper industry is only the primary performance characteristics displayed by the particles of chitin and its derivatives in the state of macroscopic size or exists only as a modification unit of the material, and cannot really show its biological activity, A complete picture of performance characteristics such as chemical structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 100 tons of ordinary containerboard waste paper waste water (comprehensive water) as an example

[0043] 1. A method for processing papermaking wastewater by a nano-chitosan combined flocculation system is to directly add 300 kilograms (concentration: 4.76%) polyaluminum chloride in papermaking wastewater under room temperature and stirring conditions, and stir for 10 minutes as the first secondary treatment fluid.

[0044] 2. At room temperature and under stirring conditions, gradually add 1.5 tons (concentration: 0.001%) of chitosan acetic acid aqueous solution to the treatment solution for the first time, and then stir for 10 minutes to be the treatment solution for the second time.

[0045]3. At room temperature and under stirring conditions, gradually add 1.0 tons (concentration: 0.001%) of nano-chitosan sol synthesized according to the Chinese invention patent (patent number: ZL02122792.6) to the second treatment solution, and discharge it into the precipitat...

Embodiment 2

[0048] Take 100 tons of high-strength corrugated paper waste paper wastewater (comprehensive water) as an example

[0049] 1. A method for processing papermaking wastewater by a nano-chitosan combined flocculation system is to directly add 300 kilograms (concentration: 4.76%) polyaluminum chloride in papermaking wastewater under room temperature and stirring conditions, and stir for 10 minutes as the first secondary treatment fluid.

[0050] 2. At room temperature and under stirring conditions, gradually add 2.0 tons (concentration: 0.001%) of chitosan acetic acid aqueous solution to the first treatment solution, and then stir for 10 minutes to become the second treatment solution.

[0051] 3. At room temperature and under stirring conditions, gradually add 1.5 tons (concentration: 0.0005%) of nano-chitosan sol synthesized according to the Chinese invention patent (patent number: ZL02122792.6) to the second treatment solution, and discharge it into the precipitate The pool is...

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PUM

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Abstract

The invention belongs to treatment and comprehensive utilization of three wastes and relates to a method for treating papermaking wastewater by adopting a nano chitosan composition flocculation system. Currently, most of flocculating agents for treating the papermaking wastewater are polymeric aluminum salts and cation polyacrylamide, the polymeric aluminum salts and the cation polyacrylamide have insufficient flocculation capability for pollution sources in the wastewater, and precipitates have defects of coarse particles, loosening and the like. Nano chitosan sol has a three-dimensional network conformation and has excellent flocculation characteristic. Compared with a composition of the polymeric aluminum salts and the cation polyacrylamide, the nano chitosan composition flocculation system has the advantages that the relative flocculation rate (percent) for the pollution resources in the wastewater is improved by 40 percent; in treated supernatant water, an SS (Suspended Solid) value is similar and a CODcr (Chemical Oxygen Demand) value and a BOD5 (Biochemical Oxygen Demand) value are reduced by 8 to 12 percent; and the treatment cost is only 26 percent of the treatment cost of the composition of the polymeric aluminum salts and the cation polyacrylamide. By microscopic observation, adsorption points are formed by flocculate in a fiber and chitosan sol network, fine particles are precipitated and the precipitation is compact. The nano chitosan composition flocculation system is a pure natural flocculation material with both high activity and biodegradability.

Description

[0001] Technical field: the invention belongs to the treatment and comprehensive utilization of three wastes. The method adopts a nano-chitosan combined flocculation system to treat papermaking wastewater. Background technique: [0002] Papermaking is needed for the survival and development of human beings, and the huge amount of waste water discharged by the papermaking industry has caused huge socio-economic and environmental ecological pressures on the sustainable development of human society. [0003] A large amount of wastewater discharged by the paper industry contains a large amount of cellulose, lignin and chemicals, which consume a lot of oxygen, and are the most concerned pollution sources, especially cooking waste liquid, which has the most serious environmental pollution. There are many impurities in papermaking wastewater, and the particle size distribution is uneven. Some are in a colloidal state, and some are suspended in water. It is difficult to meet the requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F103/28
Inventor 龚正烈李正军喻阳廖方诚实
Owner 广汉恒宇新材料有限公司
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