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Method for treating printing and dyeing waste water by high pressure cavitation jet combined with fenton reagent

A technology of printing and dyeing wastewater and Fenton's reagent, which is applied in chemical instruments and methods, oxidized water/sewage treatment, animal husbandry wastewater treatment, etc., can solve the problems of low removal rate, incomplete treatment of COD and chroma of printing and dyeing wastewater, and achieve Good effect, complete degradation and high efficiency

Inactive Publication Date: 2009-06-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to aim at the deficiencies in the prior art, provide a kind of method of high-pressure cavitation jet combined with Fenton's reagent to process printing and dyeing wastewater, this method not only solves the treatment of printing and dyeing wastewater, but also solves the problem of COD and chroma treatment of printing and dyeing wastewater The problem of thoroughness and low removal rate

Method used

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  • Method for treating printing and dyeing waste water by high pressure cavitation jet combined with fenton reagent
  • Method for treating printing and dyeing waste water by high pressure cavitation jet combined with fenton reagent

Examples

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Effect test

example 1

[0019] Example 1, when processing COD is 1385mg / L, chromaticity is 658 times, pH value is 6.0 when printing and dyeing waste water, carry out according to the following specific steps:

[0020] 1. Use hydrochloric acid to adjust the pH value of printing and dyeing wastewater to 2.0;

[0021] 2. Perform Fenton reagent oxidation treatment on the printing and dyeing wastewater after pH adjustment: add ferrous sulfate at a stirring speed of 200r / min to make the concentration of ferrous sulfate ion 0.009mol / L, then add hydrogen peroxide to make hydrogen peroxide The concentration in the printing and dyeing wastewater is 0.1mol / L, and the printing and dyeing wastewater after adding hydrogen peroxide continues to stir for 30 minutes

[0022] 3. Use sodium hydroxide to adjust the pH value of the printing and dyeing wastewater after the oxidation treatment to 8.0, add hydrogen peroxide to it so that the concentration of hydrogen peroxide in it is 0.01mol / L, stop stirring, and then use ...

example 2

[0027] Example 2, when processing the printing and dyeing wastewater whose COD is 1586mg / L, chroma is 722 times, and pH value is 6.4, carry out according to the following specific steps:

[0028] 1. Use sulfuric acid to adjust the pH value of printing and dyeing wastewater to 2.8;

[0029]2. Perform Fenton reagent oxidation treatment on the printing and dyeing wastewater after pH adjustment: add ferrous sulfate at a stirring speed of 230r / min to make the concentration of ferrous sulfate ion 0.012mol / L, then add hydrogen peroxide to make hydrogen peroxide The concentration in the printing and dyeing wastewater is 0.13mol / L, and the printing and dyeing wastewater after adding hydrogen peroxide is continuously stirred for 35 minutes;

[0030] 3. Use sodium hydroxide to adjust the pH value of the printing and dyeing wastewater after the oxidation treatment to 9.0, add hydrogen peroxide to it so that the concentration of hydrogen peroxide in it is 0.03mol / L, stop stirring, and then...

example 3

[0035] Example 3, when processing the printing and dyeing wastewater whose COD is 1733mg / L, chroma is 844 times, and pH value is 6.6, carry out according to the following specific steps:

[0036] 1. Use sulfuric acid to adjust the pH value of printing and dyeing wastewater to 3.5;

[0037] 2. Perform Fenton reagent oxidation treatment on the printing and dyeing wastewater after pH adjustment: add ferrous sulfate at a stirring speed of 250r / min to make the concentration of ferrous sulfate ion 0.015mol / L, then add hydrogen peroxide to make hydrogen peroxide The concentration in the printing and dyeing wastewater is 0.15mol / L, and the printing and dyeing wastewater after adding hydrogen peroxide is continuously stirred for 40 minutes;

[0038] 3. Use sodium hydroxide to adjust the pH value of the printing and dyeing wastewater after the oxidation treatment to 10.0, add hydrogen peroxide to it so that the concentration of hydrogen peroxide in it is 0.05mol / L, stop stirring, and th...

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Abstract

The present invention relates to treatment of printing and dyeing waste water. The process of treating printing and dyeing waste water includes the following steps: regulating pH value with acid, oxidizing with the Fenton reagent, cavitation treating with high pressure jet, coagulating sedimentation, adsorbing with fly ash and regulating pH value before exhausting. The present invention features the organic combination of high pressure cavitation jet and the Fenton reagent in treating printing and dyeing waste water. The present invention has obviously raised COD eliminating rate and decolorizing rate, high energy utilizing rate and other advantages.

Description

technical field [0001] The invention relates to a method for treating printing and dyeing wastewater. Background technique [0002] The textile printing and dyeing industry is one of the industrial sectors with large water consumption and large discharge in my country. Printing and dyeing wastewater accounts for 80% of all industrial wastewater. According to incomplete statistics, my country's printing and dyeing wastewater discharges 3 to 4 million m3 per day. The pH value of printing and dyeing wastewater varies greatly, generally 6-13, the chroma is dark, up to 1000 times, and the biodegradability is poor. The COD is 400-4000mg / L, and the BOD is 100-150mg / L. The quality of printing and dyeing wastewater is complex, containing a large amount of slurry and auxiliaries, especially reactive and azo dyes, as well as various carcinogenic and mutagenic toxic pollutants, such as aniline with benzene ring, amino group, azo group, etc. , nitrobenzene, phthalic acid, etc. Printing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/72C02F1/52C02F1/28C02F103/20
Inventor 李晓红卢义玉葛强康勇冯欣艳兰华菊程君李倩
Owner CHONGQING UNIV
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