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Method for recovering dyes in dyeing waste water

A recycling method, dyeing wastewater technology, applied in the direction of organic dyes, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of environmental pollution, increase the cost of fabrics, etc. simple effect

Inactive Publication Date: 2011-06-15
WUJIANG MINGZHU TEXTILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the waste water is discharged directly without dye recovery, it will not only increase the cost of the fabric, but also cause pollution to the environment

Method used

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Experimental program
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Embodiment Construction

[0009] The present invention will be described in further detail below in conjunction with specific embodiments.

[0010] In this embodiment, the dyeing wastewater contains about 20% of residual sulfur dyes, and the salt content is 50kg / m 3 , pH>10.

[0011] The operation of recovering the dye is carried out as follows: first, add industrial-grade sulfuric acid to the pool where the dyeing wastewater is stored, adjust the pH of the wastewater to between 4 and 5, add an appropriate amount of coagulant aluminum sulfate to stir, stir for about 1 hour, stop stirring, The separated precipitate was filtered and recovered to obtain color paste. The color paste can be further utilized.

[0012] In summary, the method of the present invention is simple to operate and low in cost, not only can effectively solve the problem of environmental pollution caused by dye discharge, but also can improve the utilization rate of dye and reduce the production cost of fabrics.

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Abstract

The invention relates to a method for recovering dyes in dyeing waste water, which comprises the following steps of: adding acid and a coagulating agent into dye-containing dyeing waste water; regulating the pH value of the waste water to be between 4 and 5; and stirring for 0.5 to 2 hours, precipitating, and filtering sediments to form color paste for recovering. The method is simple in operation and low in cost, so the problem of environmental pollution caused by dye discharge can be solved effectively, the utilization rate of the dyes also can be improved, and the production cost of a texture can be reduced.

Description

technical field [0001] The invention relates to a method for recovering dyes in dyeing wastewater. Background technique [0002] In the prior art, the color of toxic substances and waste water is very dark. Different fiber raw materials require different dyes, auxiliaries and dyeing methods, coupled with the difference in dyeing performance, dyeing solution concentration, dyeing equipment and scale, the dyeing wastewater changes very frequently, and the pollution readings vary greatly. Generally speaking, the residual dye content in the industrial wastewater discharged from the dyeing process is as high as 20%. If the waste water is directly discharged without dye recovery, it will not only increase the cost of the fabric, but also cause pollution to the environment. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for recovering dyes in dyeing wastewater t...

Claims

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Application Information

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IPC IPC(8): C09B67/54C02F9/04C02F1/52
Inventor 王建林
Owner WUJIANG MINGZHU TEXTILE