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Treatment method of arsenic-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as poor treatment effect, increased cost, human health hazards, etc.

Active Publication Date: 2017-12-01
广东先导微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If gallium arsenide wastewater is directly discharged outside, it will not only cause serious pollution to the environment, harm human health, but also bring huge waste, thus causing unnecessary economic losses to enterprises
[0003] The existing treatment process is purely manual operation, the treatment effect is not good, and the steps of adding medicine are cumbersome, which increases the cost of treatment
In addition, the existing technology will add sulfuric acid in the treatment, which can pollute the water body and soil, and cause harm to human health through the tissues of the skin and mucous membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Use a lift pump to lift the waste water from the gallium arsenide collection tank to the 1# reaction tank that can hold 30 tons of waste liquid, in which the mass concentration of arsenic is 60 mg / L.

[0064] Add 0.003%wt of H to the 1# reaction tank 2 o 2 , As in the wastewater 3+ Oxidize 4h to As 5+ back. Fe dissolved by adding 0.023%wt polyferric sulfate 3+ Stir for 40 min to adjust pH=5. Then add 0.005%wt of CaO, then turn on the 1# mixer and stir at room temperature for 30min. Then add 0.001% of industrial diatomaceous earth, stir and react for 30 minutes, and press filter.

[0065] Adjust the pressure between the plates of the 1# plate and frame mud compactor to between 15kg and keep the pressure constant for 30 minutes before passing water. Check whether the filter press is in a tight state, check the pipeline valve, turn on the 1# filter press pump, and then turn on the 1# filter press circulating pump to press the filter. The filtrate clarified by press...

Embodiment 2

[0068] Use a lift pump to lift the waste water from the gallium arsenide collection pool to the 1# reaction tank that can hold 30 tons of waste liquid, in which the mass concentration of arsenic is 70mg / L.

[0069] Add 0.0035%wt of H to the 1# reaction tank 2 o 2 , As in the wastewater 3+ Oxidize 4h to As 5+ back. Add 0.025%wt ferric chloride to dissolve the Fe 3+ Stir for 45 min to adjust pH=6. After adding 0.0055% wt of CaO, turn on 1# stirrer and stir for 35 minutes at room temperature. Then add 0.001% wt of industrial diatomaceous earth, stir and react for 35 minutes, and press filter.

[0070] Adjust the pressure between the plates of the 1# plate and frame mud compactor to between 15kg and keep the pressure constant for 30 minutes before passing water. Check whether the filter press is in a tight state, check the pipeline valve, turn on the 1# filter press pump, and then turn on the 1# filter press circulating pump to press the filter. The filtrate clarified by p...

Embodiment 3

[0073] Use a lift pump to lift the waste water from the gallium arsenide collection tank to the 1# reaction tank that can hold 30 tons of waste liquid, in which the mass concentration of arsenic is 80 mg / L.

[0074] Add 0.004%wt of H to the 1# reaction tank 2 o 2 , As in the wastewater 3+ Oxidize 4h to As 5+ back. Fe dissolved by adding 0.03%wt polyferric sulfate 3+ Stir for 40 min to adjust pH=5. After adding 0.006%wt of CaO, turn on 1# stirrer and stir at room temperature for 40min. Then add 0.0015% wt of industrial diatomaceous earth, stir and react for 30 minutes, and then press filter.

[0075] Adjust the pressure between the plates of the 1# plate and frame mud compactor to between 15kg and keep the pressure constant for 30 minutes before passing water. Check whether the filter press is in a tight state, check the pipeline valve, turn on the 1# filter press pump, and then turn on the 1# filter press circulating pump to press the filter. The filtrate clarified by ...

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PUM

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Abstract

The invention provides a method for treating arsenic-containing wastewater, comprising: A) mixing and reacting the wastewater with a first reaction material, and press-filtering to obtain a filtrate; the first reaction material includes hydrogen peroxide, a ferric source compound, calcium oxide and diatomaceous earth; B) mixing and reacting the filtrate with the second reaction material, and press-filtering to obtain treated waste water; the second reaction material contains ferric source compound and polyacrylamide. The present invention preliminarily achieves the purpose of removing arsenic through oxidation of hydrogen peroxide, and then flocculation and sedimentation after coagulation and adsorption of ferric source compound, calcium oxide and diatomaceous earth; The purpose of removing arsenic. Experimental results show that through the method for treating arsenic-containing wastewater of the present invention, the arsenic content of the final treated water is below 0.5 mg / L.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating arsenic-containing wastewater. Background technique [0002] The source of AS-containing wastewater is mainly the wastewater containing gallium arsenide solid particles produced in the grinding stage of the production process. The chemical formula of gallium arsenide is GaAs, the molecular weight is 144.63, the black-gray solid, the melting point is 1238℃, and the density is 5.37g / cm3. Arsenic is a highly toxic substance, which is harmful to the human body and the environment. It is a national first-class pollutant, and its maximum allowable emission mass concentration is 0.5mg / L. If GaAs wastewater is directly discharged, it will not only cause serious pollution to the environment and harm human health, but also bring huge waste, thus causing unnecessary economic losses to enterprises. [0003] The existing treatment process is purely manual operation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/58
Inventor 何金龙梁北柱张凯城张宇波于长南
Owner 广东先导微电子科技有限公司
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