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Technique for processing anionic dye printing and dyeing wastewater

A technology for anionic dyes and printing and dyeing wastewater, applied in natural water treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc. Deal with problems such as large fluctuations in effect, achieve the effects of reducing secondary pollution, small footprint, and convenient operation

Inactive Publication Date: 2008-05-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a treatment process for anionic dye printing and dyeing wastewater, which uses foam separation technology to treat anionic dye printing and dyeing wastewater, which overcomes the large footprint of equipment in the physical and chemical method and the secondary pollution caused by the biochemical method. The chromaticity removal rate is not high and the treatment effect fluctuates greatly, and the physical, chemical and biochemical combination method has the disadvantages of complex process and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first step, collection and detection of anionic dye printing and dyeing wastewater

[0027] Wastewater from a printing and dyeing factory was collected. It was detected that the main dye and pigment component of the anionic dye printing and dyeing wastewater was methyl orange, and the molar concentration of methyl orange was 9.16×10 -5 mol / L, COD 600mg / L, color 950 times, pH 9.20;

[0028] The second step, anionic dye printing and dyeing wastewater pretreatment

[0029] The pH value of the anionic dye printing and dyeing wastewater described in the first step is adjusted to 6.0 with hydrochloric acid, and it is equally divided into four batches;

[0030] The third step, foam separation cycle decolorization process

[0031] For the first decolorization, cationic surfactant CTAB is added to the first batch of anionic dye printing and dyeing wastewater after the second step pretreatment, and the molar ratio of the added CTAB to methyl orange in the anionic dye printi...

Embodiment 2

[0044] The first step, collection and detection of anionic dye printing and dyeing wastewater

[0045] The wastewater from a printing and dyeing factory was collected. It was tested that the main dye and pigment component of the anionic dye printing and dyeing wastewater was chrome blue black R, and the molar concentration of chrome blue black R was 4.8×10 -5 mol / L, COD 750mg / L, color 850 times, pH 11.2;

[0046] The second step, anionic dye printing and dyeing wastewater pretreatment

[0047] The pH value of the anionic dye printing and dyeing wastewater described in the first step is adjusted to 4.0 with hydrochloric acid, and it is equally divided into four batches;

[0048] The third step, foam separation cycle decolorization process

[0049] In the first decolorization, cationic surfactant CTAB is added to the first batch of anionic dye printing and dyeing wastewater after the second pretreatment, and the molar ratio of the added CTAB to the chrome blue black R in the a...

Embodiment 3

[0062] The first step, collection and detection of anionic dye printing and dyeing wastewater

[0063] The wastewater from a printing and dyeing factory was collected, and the main dye and pigment component of the anionic dye printing and dyeing wastewater was Acid Scarlet GR, and the molar concentration of Acid Scarlet was 7.19×10 -5 mol / L, COD 800mg / L, chromaticity 1100 times, pH 8.5;

[0064] The second step, anionic dye printing and dyeing wastewater pretreatment

[0065] The pH value of the anionic dye printing and dyeing wastewater described in the first step is adjusted to 7.0 with hydrochloric acid, and it is equally divided into four batches;

[0066] The third step, foam separation cycle decolorization process

[0067] In the first decolorization, the cationic surfactant CTAB was added to the first batch of anionic dye printing and dyeing wastewater after the second pretreatment, and the molar ratio of the added CTAB to the acid scarlet GR in the wastewater was 1.4...

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Abstract

The invention provides a treatment process of anionic dye dyeing waste water, which belongs to the field of waste water treatment, and disposes the anionic dye dyeing waste water by use of the foam separation technology. The invention has the exact steps as follows: 1. the anionic dye dyeing waste water is collected and detected; 2. the anionic dye dyeing waste water is pretreated; 3. the process of foam separation circular decoloring means adding cationic surfactant hexadecyl trimethyl ammonium bromide into the anionic dye dyeing waste water and decoloring for four times in a bubble column; and 4. vaporizing and crystallizing. The invention has advantages of simple device, small investment, few energy consumption and convenient operation, not only has high chrominance removal rate and small treating effect fluctuation, but also obtains the dye coarse product used for the dyeing process again.

Description

technical field [0001] The technical scheme of the invention belongs to the field of wastewater treatment, in particular to the treatment process of anionic dye 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24C02F103/34
Inventor 吴兆亮李新涛卢珂
Owner HEBEI UNIV OF TECH
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