Technique for treating chitin waste water

A wastewater treatment and chitin technology, which is applied in biological water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. economic effect

Inactive Publication Date: 2008-07-09
ZHEJIANG UNIV
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Problems solved by technology

[0003] The invention provides a method to solve the prominent problem of chitin wastewater pollution with strong acid-base and high-salt and high-protein characteristics, realize efficient and safe treatment of wastewater in the production process of chitin and effective recycling of protein, and ensure the sustainable development of the industry

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  • Technique for treating chitin waste water

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Embodiment Construction

[0015] As shown in Figure 1, the pickling wastewater and alkali washing wastewater generated in the production of chitin are stored separately. During treatment, the two wastewaters are firstly mixed for neutralization and precipitation. The pH is more accurately controlled at 6.0-6.5. At this time, the comprehensive wastewater COD Cr About 28000-40000mg / L, NH 4 + -N about 350-700mg / L. After fully neutralizing the precipitated wastewater, the protein is immediately precipitated, and the protein precipitate is immediately pumped out through the sludge pump. The fresh protein has a density of about 0.94g / ml and a moisture content of about 95-97%. After dehydration and drying, the protein is recovered for use as For feed, etc., the equivalent dry protein recovery is 7.0-7.8g / L comprehensive wastewater. The supernatant after neutralization and precipitation enters the flocculation sedimentation tank through the outlet weir and enters the flocculation sedimentation tank for floc...

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Abstract

The invention discloses a chitin wastewater treating technique. Firstly parting of acid and alkaline cleaning wastewater is stored, integrated wastewater pH is adjusted via flow-control, then neutralization settlement, flocculation settlement, pre-aeration adjustment, A / O biochemical degradation and secondary precipitation for proteins are finished sequentially, and finally the wastewater reaches the standard and is discharged. The invention precipitates proteins in the wastewater in the maximal degree before biochemical treatment of the integrated wastewater by using the electric point precipitation character of proteins and the like, thereby avoiding to increasing of waste water disposal load caused by proteolysis, lowering difficulty of the waste water disposal, ensuring feasibility of biochemical system, simultaneously recycling reasonably proteins, resolving prominent problems of chitin wastewater pollution with the characters of superacid alkali and high salt and high protein, achieving highly effective and safe treatment of the wastewater and effective reclamation and utilization of the proteins, and ensuring sectional sustainable development.

Description

technical field [0001] The invention relates to a treatment technology of chitin wastewater, specifically refers to a method for treating the strongly acidic, alkaline, high-salt and high-protein cleaning wastewater produced in the production process of chitin by classification storage, protein recovery and biochemical degradation, and finally making it up to standard High-efficiency chitin wastewater treatment technology for discharge. Background technique [0002] Chitin is a natural organic compound second only to cellulose on the earth, and it is also the only available animal fiber, which widely exists in the back shells of arthropods such as shrimps and crabs. The production of chitin mainly includes acid immersion, acid cleaning, alkali boiling, and alkali cleaning on the back shells of arthropods such as shrimps and crabs to remove calcium and protein respectively. However, due to the cleaning after removing calcium and protein A large amount of strong acid, alkalin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/52C02F3/12
CPCY02W10/10
Inventor 龙於洋沈东升胡立芳何若姚俊楼斌冯华军龙焰方程冉
Owner ZHEJIANG UNIV
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