Method for treating waste water containing sulfuric acid in production process of dyes and intermediates

A production process and wastewater treatment technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of stable operation, high degree of automation, and few supporting facilities

Active Publication Date: 2013-10-02
ZHEJIANG JIHUA GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of recycling waste water produced in the production of dyes and intermediates, the present invention proposes a method for treating waste water containing sulfuric acid in the producti

Method used

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  • Method for treating waste water containing sulfuric acid in production process of dyes and intermediates
  • Method for treating waste water containing sulfuric acid in production process of dyes and intermediates
  • Method for treating waste water containing sulfuric acid in production process of dyes and intermediates

Examples

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Example Embodiment

[0043] Example 1

[0044] Process flow chart such as figure 1 As shown, the waste water containing sulfuric acid (taken from the mother liquor of the disperse blue 291:4 and the disperse violet 93:4 production process is mixed, the acidity of sulfuric acid is about 3%, the color is 750 times) is pumped into the decolorization kettle, and the quality of the waste water is added. 2.5% activated carbon adsorption decolorization, the decolorization temperature is controlled at 45℃~50℃, keep for 3 hours, sample and filter, the filtrate has 9 times the color, and the decolorization is over. Filter and separate to obtain decolorized waste water and activated carbon residue, pump the decolorized waste water into the adsorption kettle, add 3% polyacrylamide of the decolorized waste water mass, control the temperature at 30℃~35℃, keep it for 1 hour, filter to obtain adsorption waste residue and The adsorbed wastewater is pumped into the neutralization kettle, and neutralized with 30% liqu...

Example Embodiment

[0046] Example 2

[0047] Pump sulfuric acid-containing wastewater (taken from the mother liquor of Disperse Blue 291:4 production process, sulfuric acid acidity is about 9%, and chroma 700 times) into the decolorization kettle, start stirring and add 1% of sulfuric acid-containing wastewater mass for decolorization and decolorization temperature Control at 20℃~25℃, keep for 1 hour, sample and filter, the color of the filtrate is 8 times, and the decolorization is over. Filter and separate to obtain decolorized waste water and activated carbon residue, pump the decolorized waste water into the adsorption kettle, add 0.05% EDTA of the decolorized waste water mass, control the temperature at 20℃~25℃, keep for 5 hours, filter to obtain the adsorption waste residue and after adsorption Wastewater: Pump the adsorbed wastewater into the neutralization kettle, neutralize it with flake caustic soda (sodium hydroxide solid) to a pH of about 7-8, filter and separate to obtain sodium sulfat...

Example Embodiment

[0049] Example 3

[0050] Pump sulfuric acid-containing wastewater into the decolorization tank (taken from the mother liquor water of the Disperse Red FBS production process, sulfuric acid acidity is about 16%, and color is 900 times), start stirring and add 5% of sulfuric acid-containing wastewater mass to decolorize, and control the decolorization temperature Incubate at 65℃~70℃ for 5 hours, sample and filter, the color of the filtrate is 22 times, filtered and separated to obtain decolorized waste water and activated carbon residue. After decolorization, the waste water is pumped into the adsorption kettle, and 5% hexametaphosphoric acid is added to the decolorized waste water. Sodium, the temperature is controlled at 45℃~50℃, keep for 5 hours, filter the adsorbed waste residue and adsorbed waste water, add 30% hydrogen peroxide to the adsorbed waste water for oxidation, the amount of hydrogen peroxide is 0.1% of the quality of the adsorbed waste water, and the oxidation tempe...

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Abstract

The invention relates to the technical field of treatment of waste water. In order to solve the problem of recycle of waste water produced in production of dyes and intermediates, the invention provides a method for treating waste water containing sulfuric acid in a production process of dyes and intermediates. The treatment method comprises the following steps of: decolorization, adsorption, neutralization and concentration. By adopting the treatment method, sodium sulfate or ammonium sulfate is separated from the waste water, the recovered water can be reused, and zero discharge of the waste water is realized.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method and application for cleaning and treating waste water containing sulfuric acid in the production of dyes and intermediates. Background technique [0002] The production process of dyes and intermediates will produce a large amount of sulfuric acid wastewater. At present, most enterprises use lime or carbide slag for neutralization and precipitation, and then filter out calcium sulfate slag. This calcium sulfate slag contains some poisonous and harmful substances, which is also pollution itself. However, the harmless treatment of it currently has problems such as large investment, high cost, and technical difficulty. [0003] Most foreign countries use incineration to treat waste residues. The residues after incineration are sterile and tasteless, and their volume is greatly reduced to achieve the purpose of harmlessness and reduction. However, the amount of...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/242C01D5/02
Inventor 孙岩峰韩立峰简卫周火良
Owner ZHEJIANG JIHUA GROUP
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