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Method for shunting and processing leather making waste water

A technology of tannery wastewater and treatment methods, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problems of high cost of wastewater treatment methods and low investment in treatment equipment, etc. Achieve the effect of less investment in processing equipment, low processing cost and high processing efficiency

Active Publication Date: 2014-12-31
TONGXIANG GAOQIAO LEATHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high cost of the wastewater treatment method in the prior art, and provide a split treatment method for tannery wastewater, which has the advantages of mild reaction conditions, fast reaction speed, less investment in treatment equipment, and good treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of tannery waste water diversion treatment method, described treatment method is carried out according to the following steps:

[0019] (1) The tanning wastewater containing chromium and ammonia nitrogen in each process of the tanning production workshop was separated from the production water of other processes and collected in the sedimentation tank. The measured total chromium content was 100mg / L and the ammonia nitrogen content was 800mg / L;

[0020] (2) Add the waste liquid produced in the production of alkaline extraction of dextran to the above sedimentation tank to adjust the pH of the tannery wastewater to 8.0, the mass fraction of dextran in the waste liquid produced in the production of alkaline extraction of glucose is 0.5%, then heated to 45°C, reacted for 5 hours, then added activated bentonite with 5% mass of tanning wastewater, and then separated and removed the precipitate. The total chromium content was measured to be 1.0mg / L, and the chromium rem...

Embodiment 2

[0023] A kind of tannery waste water diversion treatment method, described treatment method is carried out according to the following steps:

[0024] (1) The chromium-containing and ammonia-nitrogen-containing tannery wastewater from each process in the tanning production workshop was separated from the production water in other processes and collected in the sedimentation tank. The measured total chromium content was 120mg / L and the ammonia nitrogen content was 1000mg / L ;

[0025] (2) Add the waste liquid produced in the production of alkaline extraction of dextran to the above sedimentation tank to adjust the pH of the tannery wastewater to 10.0, the mass fraction of dextran in the waste liquid produced in the production of alkaline extraction of glucose is 1.2%, then heated up to 30°C, reacted for 8h, then added 8% activated bentonite and 0.2% polyacrylamide of tannery wastewater quality, and then separated and removed the precipitate. The total chromium content was measure...

Embodiment 3

[0029] A kind of tannery waste water diversion treatment method, described treatment method is carried out according to the following steps:

[0030] (1) The chromium-containing and ammonia-nitrogen-containing tannery wastewater from each process in the tanning production workshop is separated from the production water in other processes and collected in the sedimentation tank. The measured total chromium content is 100mg / L and the ammonia nitrogen content is 800mg / L ;

[0031] (2) Add the waste liquid produced in the production of alkaline extraction of dextran to the above sedimentation tank to adjust the pH of the tannery wastewater to 9.0, the mass fraction of dextran in the waste liquid produced in the production of alkaline extraction of glucose is 0.8%, then heated up to 40°C, reacted for 6 hours, then added 8% activated bentonite and 0.5% polyacrylamide of tannery wastewater, and then separated and removed the precipitate. The total chromium content was measured to be ...

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Abstract

The invention relates to a method for processing waste water, and especially relates to a method for shunting and processing leather making waste water. The method comprises the following steps: 1)shunting leather making waste water containing chromium and ammonia nitrogen in each step and water used for production in other steps and then collecting to a sedimentation basin; 2)adding waste liquid or waste residue generated in a glucan extraction process by an alkali method in the sedimentation basin to adjust the pH value of leather making waste water to 8.0-10.0, then heating to 30-45 DEG C, reacting for 5-8 hours, then separating and removing deposition; and 3)processing the leather making waste water after the deposition is removed by passing through a SBR equalizing tank. According to the invention, waste liquid or waste residue from glucan extraction by the alkali method is used for processing leather making waste water, so that waste can be treated for process another waste, and the method has the advantages of less investment of processing equipment, reasonable treatment process, high processing efficiency and low processing cost.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for diverting tanning wastewater. Background technique [0002] The leather industry has become one of the high water consumption and heavy pollution industries in the light industry after the paper industry. Taking cowhide leather as an example, it takes 0.8-1.0t of water to process and produce a piece of cowhide. At present, my country's leather industry annually The amount of wastewater discharged to the environment is 80 to 12 million tons. The tanning process mainly includes degreasing, deliming, softening, chrome tanning, retanning, neutralization, dyeing and color fixing, and water washing. Among them, the chrome tanning and retanning processes are Usually a large amount of chrome-containing tanning agent (such as: chrome powder) is used, resulting in a large amount of high-concentration chromium-containing wastewater, Cr 3+ The content is generally 60~1500mg / L. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 潘建新朱雪良周志贤钱金明张团社
Owner TONGXIANG GAOQIAO LEATHER
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