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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 production process of dyes and intermediates. After the method is processed, the waste water is separated from sodium sulfate or ammonium sulfate. Recycled water can be recycled and reused to achieve zero discharge of waste water

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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Effect test

Embodiment 1

[0044] Process flow chart such as figure 1As shown, pump waste water containing sulfuric acid into the decolorization kettle (taken from the mother liquid water mixed in the production process of Disperse Blue 291:4 and Disperse Violet 93:4, the acidity of sulfuric acid is about 3%, and the color is 750 times), start stirring and add the quality of waste water 2.5% activated carbon adsorption decolorization, decolorization temperature is controlled at 45 ℃ ~ 50 ℃, heat preservation for 3 hours, sampling and filtration, the color of the filtrate is 9 times, and the decolorization is completed. Filtration and separation to obtain decolorized wastewater and activated carbon residue, pump the decolorized wastewater into the adsorption kettle, add polyacrylamide with 3% of the decolorized wastewater quality, control the temperature at 30°C to 35°C, keep for 1 hour, and filter to obtain the adsorption waste residue and The wastewater after adsorption is pumped into the neutralizatio...

Embodiment 2

[0047] Pump waste water containing sulfuric acid into the decolorization kettle (taken from the mother liquid water in the production process of Disperse Blue 291:4, the acidity of sulfuric acid is about 9%, and the color is 700 times), start stirring and add activated carbon with 1% mass of waste water containing sulfuric acid for decolorization, the decolorization temperature Control at 20°C to 25°C, keep warm for 1 hour, sample and filter, the color of the filtrate is 8 times, and the decolorization is completed. Filtration and separation to obtain decolorized wastewater and activated carbon slag, pump the decolorized wastewater into the adsorption kettle, add 0.05% EDTA of the decolorized wastewater quality, control the temperature at 20°C to 25°C, keep for 5 hours, filter to obtain the adsorption waste residue and the adsorbed Waste water: pump the waste water after adsorption into the neutralization tank, neutralize it with caustic soda (sodium hydroxide solid) to a pH va...

Embodiment 3

[0050] Pump waste water containing sulfuric acid into the decolorization kettle (taken from the mother liquid water in the production process of Disperse Red FBS, the acidity of sulfuric acid is about 16%, and the color is 900 times), start stirring and add activated carbon with 5% mass of waste water containing sulfuric acid for decolorization, and control the decolorization temperature At 65°C-70°C, keep warm for 5 hours, sample and filter, the filtrate chroma is 22 times, filter and separate to obtain decolorized wastewater and activated carbon residue, pump the decolorized wastewater into the adsorption kettle, add hexametaphosphoric acid with 5% of the decolorized wastewater quality Sodium, the temperature is controlled at 45°C to 50°C, keep it for 5 hours, filter the adsorption waste residue and the wastewater after adsorption, add 30% hydrogen peroxide to the wastewater after adsorption for oxidation, the amount of hydrogen peroxide is 0.1% of the quality of the wastewate...

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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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