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Process for processing acidic arsenic-containing waste water

A technology for treating process and waste water, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as increasing arsenic removal efficiency, accelerating sedimentation speed, shortening sedimentation time, etc., to achieve The effect of reducing the amount of arsenic-containing iron slag, low cost, and stable storage of waste slag

Active Publication Date: 2017-03-22
昆明先导新材料科技有限责任公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN103043812A discloses an advanced treatment method for arsenic-containing wastewater. This method oxidizes trivalent arsenic to pentavalent arsenic by oxidation, and then adds iron salt and high molecular organic flocculant to precipitate arsenic, which speeds up the precipitation speed, shortens the settling time, and increases The removal efficiency of arsenic is improved, but the amount of iron salt is added to make the molar ratio of Fe / As in the solution reach 5~50, and the amount of arsenic-containing iron slag obtained is very large
[0006] Therefore, it is necessary to provide a treatment process for acidic arsenic-containing wastewater to solve the problem of a large amount of arsenic-containing iron slag

Method used

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Embodiment 1

[0037] The present invention is used to treat arsenic-containing wastewater produced in the production process of a metallurgical company, and the treated water volume is 2m 3 , arsenic concentration 1.87g / L, free acid concentration 1.19mol / L.

[0038] 1) Pre-oxidation: Add 2.6554 kg of sodium chlorate solid with 0.5 times the molar amount of arsenic to the arsenic-containing wastewater, and carry out the oxidation reaction for 2 hours to obtain the first solution.

[0039] 2) Primary flocculation precipitation: Add 8.976 kg of solid polyferric sulfate with 0.90 times the molar amount of arsenic to the first solution, stir and react for 30 minutes, add solid sodium hydroxide to adjust the pH to 7.5, mix thoroughly for 20 minutes, and then add the mass fraction 4L of 0.3% polyacrylamide solution was stirred for 5 minutes to form a large amount of arsenic-containing slag flocs, forming the first mixed solution.

[0040] 3) First-level solid-liquid separation: the first mixed li...

Embodiment 2

[0045] The present invention is used to treat arsenic-containing wastewater produced in the production process of a metallurgical company, and the treated water volume is 2.5m 3 , arsenic concentration 5.93g / L, free acid concentration 1.95mol / L.

[0046] 1) Pre-oxidation: Add 12.1071 kg of sodium perchlorate with 0.5 times the molar amount of arsenic to the arsenic-containing wastewater, and carry out the oxidation reaction for 2.5 hours to obtain the first solution.

[0047] 2) Primary flocculation precipitation: Add 30.515 kg of ferric chloride solid with 0.95 times the molar amount of arsenic to the first solution, stir and react for 40 minutes, add solid sodium hydroxide to adjust the pH to 7.8, mix thoroughly for 20 minutes, and then add the mass fraction 5.5L of 0.5% polyacrylamide solution was stirred for 8 minutes to form a large amount of arsenic-containing slag flocs, forming the first mixed solution.

[0048] 3) First-level solid-liquid separation: the first mixed ...

Embodiment 3

[0053] The present invention is used to treat arsenic-containing wastewater produced in the production process of a metallurgical company, and the treated water volume is 5m 3 , arsenic concentration 8.75g / L, free acid concentration 2.41mol / L.

[0054] 1) Pre-oxidation: Add 43.49 kg of sodium chlorate solids with 0.7 times the molar amount of arsenic to the arsenic-containing wastewater, and carry out the oxidation reaction for 3.5 hours to obtain the first solution.

[0055] 2) Primary flocculation and precipitation: Add 116.67 kg of polyferric sulfate solid with 1.0 times the molar amount of arsenic to the first solution, stir and react for 60 minutes, add solid sodium hydroxide to adjust the pH to 7.3, mix thoroughly for 30 minutes, and then add the mass fraction 15L of 0.8% polyacrylamide solution was stirred for 6 minutes to form a large amount of arsenic-containing slag flocs, forming the first mixed solution.

[0056] 3) First-level solid-liquid separation: the first m...

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Abstract

The invention provides a process for processing acidic arsenic-containing wastewater. According to the process, chlorate or / and perchlorate is adopted as an oxidizing agent to oxidize trivalent arsenic into pentavalent arsenic, and inorganic flocculating agent and organic flocculating agent are sequentially added for flocculating, precipitating and removing arsenic. By adopting the process, a solution can be oxidized more completely by adopting the oxidizing agent, so that the dosage of inorganic flocculating agent can be reduced, the amount of arsenic-containing residue can be reduced, and subsequent arsenic-containing residue treatment cost can be reduced. The process is simple, has the advantages of low cost, high arsenic removing rate and wide application range, enables the arsenic-containing amount of treated wastewater to be less than 50ppb, and can meet the emission requirement of different emission standards.

Description

technical field [0001] The invention belongs to the technical field of heavy metal industrial wastewater treatment, in particular to a treatment process suitable for industrial wastewater with high arsenic concentration, high acidity and complex water quality discharged from industries related to arsenic chemical industry and arsenic smelting, and belongs to the depth of acidic arsenic-containing wastewater Approach. Background technique [0002] Arsenic is recognized as a highly toxic carcinogen, and is widely used in the preparation of semiconductor materials such as gallium arsenide. Because semiconductor materials have high requirements for the purity of arsenic, it is necessary to purify arsenic at the front end. During the purification process, a large amount of arsenic vapor is passed through hydrochloric acid After absorption, acidic high-concentration arsenic-containing wastewater is formed, and the arsenic content of this wastewater is often as high as 1~10g / L or m...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10
Inventor 王艳朱刘陈辉
Owner 昆明先导新材料科技有限责任公司
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