Cleaning treatment method of dying industrial acidic wastewater

A technology of acid wastewater and dyes, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as secondary pollution, high cost, hidden safety hazards, etc., and achieve clean production , solve disposal problems, and increase production efficiency

Active Publication Date: 2012-12-19
ZHEJIANG LONGSHENG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the sludge contains some toxic and harmful substances, it is listed as hazardous solid waste. During the temporary storage and storage process, as time goes by, the toxic and harmful substances in the solid waste may enter the deep layer from the surface with the leachate, threatening groundwater and Rivers, lakes and seas seriously affect the ecological environment and cause secondary pollution
As for the harmless treatment of calcium sulfate slag, there are currently a series of problems such as large investment, high cost, and technical difficulty.
[0003] Recently, there have been many domestic literature reports on the use of industrial sludge in the manufacture of building materials, such as gypsum blocks. Although its application performance meets the requirements of industrial production, its ecological safety performance cannot be accurately evaluated, and there are certain safety hazards
The method used more abroad is incineration, so that all the organic components in the sludge are carbonized to form stable inorganic substances. The residue after incineration is sterile and odorless, and the volume can be greatly reduced to achieve the purpose of harmlessness and reduction. , but the amount of sludge produced is large, the cost of incineration is high, and the investment is large

Method used

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  • Cleaning treatment method of dying industrial acidic wastewater
  • Cleaning treatment method of dying industrial acidic wastewater
  • Cleaning treatment method of dying industrial acidic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] See the process flow figure 1 , put dye wastewater containing sulfuric acid in the neutralization kettle (homogeneous water taken from the dye wastewater storage tank, sulfuric acid content is about 3%, chromaticity 500 times, TOC value 1120mg / L), start stirring, add liquid ammonia to carry out And react until the pH value is 6-7, add activated carbon with a mass of 0.25% of the dye wastewater quality for decolorization, control the decolorization temperature at 25-30°C, keep stirring for 1 hour, sample and filter, the filtrate chromaticity is 8 times, and the TOC value is 45mg / L, the decolorization is completed, separated by filtration to obtain ammonium sulfate filtrate and activated carbon residue. The ammonium sulfate filtrate is concentrated and crystallized, and the separated condensed water is reused as dye synthesis bottom water or filter cake washing water. The purified ammonium sulfate wet product is further dried and used as a finished product, and the cryst...

Embodiment 2

[0036]Put dye wastewater containing sulfuric acid in the neutralization tank (taken from the mother liquor water in the production process of C.I. Disperse Blue 291:1, the sulfuric acid content is about 10%, the chromaticity is 750 times, and the TOC value is 1802mg / L), start stirring, and add liquid ammonia Carry out neutralization reaction until the pH value is 5.0, add activated carbon with a mass of 0.3% of the dye wastewater mass for decolorization, control the decolorization temperature at 30-35°C, keep stirring for 45 minutes, sample and filter, the filtrate chromaticity is 20 times, and the TOC value is 106mg / L , add 0.1% activated carbon, continue the heat preservation reaction for 1 hour, take a second sampling analysis after the reaction, the filtrate color is 14 times, the TOC value is 87mg / L, filter out the activated carbon residue, and then add 30% (w / w) hydrogen peroxide to carry out Oxidation, the hydrogen peroxide dosing mass (percentage) is 0.15% of the filtra...

Embodiment 3

[0038] Put dye wastewater containing sulfuric acid in the neutralization tank (taken from the mother liquor water in the production process of C.I. Disperse Blue 60, the sulfuric acid content is about 15%, the chromaticity is 1000 times, and the TOC value is 2140mg / L), start stirring, and add liquid ammonia to carry out And react until the pH of the wastewater is 7-8, add activated carbon with a mass of 0.4% of the dye wastewater to decolorize, control the decolorization temperature at 30-35°C, heat and stir for 45 minutes, sample and filter, the filtrate chromaticity is 40 times, and the TOC value is 125mg / L, add 0.2% activated carbon, continue the heat preservation reaction for 1 hour, take a sample analysis, the filtrate color is 20 times, the TOC value is 90mg / L, filter out the activated carbon residue, and then pass in ozonated air with a concentration of 1% (v / v) (that is, air containing 1% ozone) for oxidation, wherein the ozone dosing mass (folded amount) is 0.05% of t...

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PUM

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Abstract

The invention provides a cleaning treatment method of dying industrial acidic wastewater. After purified by measurements of neutralization, decolouring, oxidation, condensation, separation and the like, wastewater is reused as synthetic bottom water and dye filter cake washing water for dye production, thus avoiding discharge of a lot of colored wastewater with high COD value during a traditional dye production process. By a method of using a by-product ammonium sulfate or ammonium chloride, generation of calcium sulfate is avoided during neutralization of wastewater by the use of lime. Therefore, the dangerous solid waste calcium sulfate slug treatment problem is solved, and the cleaning production purposes of water saving, emission reduction and synergy are reflected.

Description

(1) Technical field [0001] The invention relates to a method for cleaning and treating acid wastewater in the dye industry. (2) Background technology [0002] Chemical industry processes such as the production of dyes will produce a large amount of acid wastewater. At present, most production enterprises use lime or calcium carbide slag to neutralize and precipitate for treatment, and then filter out the precipitated calcium sulfate slag. Because the sludge contains some toxic and harmful substances, it is listed as hazardous solid waste. During the temporary storage and storage process, as time goes by, the toxic and harmful substances in the solid waste may enter the deep layer from the surface with the leachate, threatening groundwater and Rivers, lakes and seas seriously affect the ecological environment and cause secondary pollution. As for the harmless treatment of calcium sulfate slag, there are currently a series of problems such as large investment, high cost, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/16C01C1/24C01C1/242
Inventor 何旭斌陶建国孟明朱敬鑫杨伟军王新武欧其苏建军李建勋
Owner ZHEJIANG LONGSHENG GROUP
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