Printing and dyeing wastewater processing technique

A technology for printing and dyeing wastewater and treatment process, which is applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. Complex process and other problems, to achieve the effect of reducing secondary pollution, less quantity, and simple equipment

Inactive Publication Date: 2009-03-11
天津市瑞德赛恩新材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a treatment process for printing and dyeing wastewater, which uses foam separation technology combined with Fenton oxidation to process printing and dyeing wastewater containing two or more dyes, which overcomes the physical and chemical treatment of printing and dyeing wastewater. It occupies a large area and produces secondary pollution. The chroma removal rate is not high and the treatment effect fluctuates greatly when the biochemical method is used to treat printing and dyeing wastewater. The combination of physicochemical and biochemical methods has the disadvantages of complex process and high cost, which also makes up for it. Using foam separation technology alone to treat printing and dyeing wastewater containing more than two kinds of dyes can not achieve the desired effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Collection and filtration of printing and dyeing wastewater containing more than two dyes

[0029] Collect the printing and dyeing wastewater containing more than two dyes from the printing and dyeing factory, and filter it through the grid to remove the solid matter that cannot pass through the grid;

[0030] The second step: detection and pretreatment of printing and dyeing wastewater containing more than two kinds of dyes

[0031] Detect the printing and dyeing waste water that is obtained by the first step with known method, wherein contained dye pigment composition is reactive black KN-B active dyestuff, direct blue 2B direct dye and direct lake blue 5B direct dye, the COD of this printing and dyeing waste water is 728mg / L, the chroma is 150 times, the pH value is 8.2, the SS is 72mg / L, and the pH value is adjusted to 6.0 with hydrochloric acid;

[0032] The third step: foam separation and decolorization process

[0033] Add surfactant dodecyltrimethylam...

Embodiment 2

[0037] Step 1: Collection and filtration of printing and dyeing wastewater containing more than two dyes

[0038] Collect the printing and dyeing wastewater containing more than two dyes from the printing and dyeing factory, and filter it through the grid to remove the solid matter that cannot pass through the grid;

[0039] The second step: detection and pretreatment of printing and dyeing wastewater containing more than two kinds of dyes

[0040] Detect the printing and dyeing waste water that obtains through the first step with known method, wherein contained dye pigment composition is direct yellow brown D3G direct dye, acid golden yellow G acid dye, direct frozen yellow G direct dye and reactive black KN-B reactive dye, The COD of the printing and dyeing wastewater is 900mg / L, the chroma is 360 times, the pH value is 7.5, and the SS is 90mg / L, and the pH value is adjusted to 8.0 with sodium hydroxide;

[0041] The third step: foam separation and decolorization process

...

Embodiment 3

[0046] Step 1: Collection and filtration of printing and dyeing wastewater containing more than two dyes

[0047] Collect the printing and dyeing wastewater containing more than two dyes from the printing and dyeing factory, and filter it through the grid to remove the solid matter that cannot pass through the grid;

[0048] The second step: detection and pretreatment of printing and dyeing wastewater containing more than two kinds of dyes

[0049] The printing and dyeing wastewater obtained in the first step is detected by a known method, and the dye pigment components contained in it are cationic dark brown X-3RL cationic dye, direct red brown RN direct dye, thioindigo RRN vat dye and reactive black KN- B reactive dyes, the COD of this printing and dyeing wastewater is 870mg / L, the chroma is 450 times, the pH value is 5.8, SS82 is mg / L, and its pH value is adjusted to 7.0 with sodium hydroxide;

[0050] The third step: foam separation and decolorization process

[0051] Ad...

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Abstract

The invention provides a printing-dyeing wastewater treatment process, which belongs to the technical field of wastewater treatment. The treatment process uses a foam separation technique together with Fenton oxidation to treat printing-dyeing wastewater containing more than two dyes, and concretely comprises the following: a step of collecting and filtering the printing-dyeing wastewater containing more than two dyes; a step of detecting and pretreating, which is to detect the pigment composition, chemical oxygen consumption, color, pH value and suspended solid content of the dyes contained in the printing-dyeing wastewater and to regulate the pH value of the wastewater to between 6.0 and 8.0 by use of hydrochloric acid or sodium hydroxide; a step of separating foam and decolorizing, which is to add Dodecyl trimethyl ammonium bromide as surfactant to the wastewater treated through the previous step and then to decolorize by use of a bubbling tower; and a step of carrying out Fenton oxidation to the wastewater obtained in the previous step. The COD of the treated wastewater meets the national emission standard. The process overcomes the disadvantage that the prior printing-dyeing wastewater treatment process is large in occupied area, causes secondary pollution, is low in color removal rate, great in treatment effect fluctuation, complex in process and high in cost, or can not achieve ideal effects.

Description

technical field [0001] The technical scheme of the invention belongs to the field of wastewater treatment, in particular to a treatment process for printing and dyeing wastewater. Background technique [0002] The printing and dyeing industry is a large industrial wastewater discharger. The wastewater discharged has the characteristics of large water volume, high concentration of organic pollutants, deep color, poor biodegradability, large changes in water quality, and complex components. It is one of the more difficult industrial wastewater to treat. one. At present, the main methods used to treat printing and dyeing wastewater include physical and chemical methods, biochemical methods, and a combination of the two processes. [0003] Physicochemical methods have been used in the treatment of printing and dyeing wastewater for a long time. CN1760143A discloses "Coagulation Air Floatation Sedimentation Treatment Method and Its Integrated Device for Printing and Dyeing Wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 吴兆亮张晓龙卢珂丁红梅
Owner 天津市瑞德赛恩新材料开发有限公司
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