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Method for adopting tannin to process silkworm cocoon processing wastewater and recycle sericin protein

A technology for sericin and processing wastewater, which is applied in the preparation methods of peptides, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., which can solve the problem of low recovery rate of sericin, low treatment efficiency and high operating costs. problem, to achieve the effect of fast and efficient action, high COD removal rate, and simple separation process

Inactive Publication Date: 2013-09-18
GUILIN AONISITE ENERGY SAVING & ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods such as acid analysis method, chemical coagulation method, etc., these methods have defects such as low processing efficiency, high operating cost, low recovery rate of sericin protein and many impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention utilizes the coagulation effect of tannin on protein to achieve the purpose of recovering sericin from sericin waste water and treating waste water. The process steps are as follows:

[0022] (1) Use tannin extract to prepare an organic solvent solution containing 20 g / L of tannin in water or ethanol;

[0023] (2) Add a certain concentration of sulfuric acid or hydrochloric acid to the waste water containing sericin under stirring conditions to make the pH value of the waste water about 4;

[0024] (3) Add tannin solution under sufficient stirring until the wastewater is clarified and sericin flocculates and settles completely;

[0025] (4) Set aside, and separate solid and liquid by known methods such as sedimentation, filtration, centrifugation, etc.;

[0026] (5) After the effluent of step (4) is further purified by sand filtration, it will be discharged or reused after reaching the second-level discharge standard;

[0027] (6) The solids in step (4) are w...

Embodiment 2

[0029] (1) Use tannin extract to prepare an aqueous solution containing 8g / L of tannin;

[0030] (2) In the cocoon cooking wastewater containing sericin, add a certain concentration of sulfuric acid or hydrochloric acid under stirring conditions to make the pH value of the wastewater approximately 5;

[0031] (3) Add the tannin solution with sufficient stirring until the wastewater is clarified and the sericin flocculates and settles completely;

[0032] The rest is the same as in Example 1. Waste water reaches the second-level discharge standard for discharge or reuse.

Embodiment 3

[0034] (1) Use tannin extract to prepare an aqueous solution containing 1g / L of tannin;

[0035] (2) In the silk reeling wastewater containing sericin, add a certain concentration of sulfuric acid or hydrochloric acid under agitation to make the pH of the wastewater approximately 5;

[0036] (3) Add the tannin solution with sufficient stirring until the wastewater is clarified and the sericin flocculates and settles completely;

[0037] The rest is the same as in Example 1. Waste water reaches the second-level discharge standard for discharge or reuse.

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Abstract

The invention discloses a method which adopts tannin to process silkworm cocoon processing wastewater and recycle sericin protein. The method is characterized in that: firstly, tannin solution is prepared by a conventional method; secondly, under the condition of stirring, sulphuric acid or hydrochloric acid is added to wastewater containing sericin; thirdly, under the condition of complete stirring, the tannin solution is added until the sericin protein is completely precipitated, and the turbid wastewater can be clarified; fourthly, standing is carried out for solid-liquid separation; fifthly, after sand in water is filtered, the wastewater reaches the grade 2 discharge standard and then is discharged or recycled; and sixthly, solid substances are cleaned and treated by alcohol to cause the solid-liquid separation, and after the solid is dried the sericin protein can be obtained. The method has the advantages that the tannin is the pure natural and environment-friendly protein flocculant and is available; tannin can fast and efficiently act with the sericin protein, the sericin protein can be separated out more completely than other methods, the formed floccule is easy to precipitate, the separation technology is simple, and the COD removal rate is high.

Description

Technical field [0001] The invention relates to the treatment of organic wastewater, in particular to a method for treating silkworm cocoon processing wastewater with tannin and recovering sericin. Background technique [0002] The silkworm cocoon processing process produces high-concentration organic wastewater containing a large amount of sericin. How to effectively treat this kind of wastewater and at the same time recycle the natural resource of sericin and turn waste into treasure is an urgent problem in the cocoon processing industry. Existing methods such as acid precipitation method, chemical coagulation method, etc., these methods have disadvantages such as low processing efficiency, high operating cost, low recovery rate of sericin and many impurities. Summary of the invention [0003] The purpose of the present invention is to disclose a method for treating silkworm cocoon processing sericin wastewater with tannin and recovering sericin, which is low in cost, high in ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K14/435C07K1/30C02F1/54
Inventor 何星存
Owner GUILIN AONISITE ENERGY SAVING & ENVIRONMENT PROTECTION TECH
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