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Coupling process method for high-concentration arsenic acidic wastewater

A treatment method and technology for wastewater, applied in the field of water treatment, can solve problems such as high operating cost and atmospheric pollution, and achieve the effects of low operating cost, high arsenic removal rate, and harmless treatment.

Inactive Publication Date: 2012-07-25
SHENZHEN MINGDENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the As standard in the effluent, it is necessary to use an excessive amount of sulfide to precipitate arsenic, resulting in high operating costs and the generation of H 2 S Toxic and irritating gas, causing air pollution

Method used

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  • Coupling process method for high-concentration arsenic acidic wastewater

Examples

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Effect test

Embodiment 1

[0032] A treatment method for arsenic-containing wastewater discharged from the sulfuric acid workshop of a copper smelter, the treatment capacity of arsenic-containing wastewater is 10 m3 / h, the acid concentration is 6%, and the arsenic (As) content in the waste water reaches 4.8g / L. The steps to adopt this processing method are as follows:

[0033] (1) Precipitation of sulfate radicals: add milk of lime to the arsenic-containing wastewater to adjust the pH value, adjust the pH to 1, separate solid-liquid to obtain gypsum and arsenic-containing wastewater, and take out the gypsum after pressure filtration;

[0034] (2), oxidation precipitation: add milk of lime to the liquid separated in the previous step and add calcium hypochlorite at the same time, the molar ratio of calcium hypochlorite to the arsenic content in the treated wastewater is 1, control the reaction pH to be about 10, stir After the reaction is completed, the waste water enters the next step;

[0035] (3) P...

Embodiment 2

[0042] An application for the treatment of arsenic-containing wastewater discharged from the sulfuric acid workshop of a copper smelter. The treatment capacity of arsenic-containing wastewater is 10m3 / h, the acid concentration is 6%, and the arsenic (As) content in the wastewater reaches 4.8g / L. The steps for processing in this method are as follows:

[0043] (1) Precipitation of sulfate radicals: add milk of lime to the arsenic-containing wastewater to adjust its pH value, adjust the pH to 2, separate the solid and liquid to obtain gypsum and arsenic-containing wastewater, and take out the gypsum after pressure filtration;

[0044] (2) Oxidation precipitation: Add lime milk and sodium chlorate to the arsenic-containing wastewater adjusted in the previous step. The molar ratio of sodium chlorate to the arsenic content in the treated wastewater is 5, and the pH of the reaction is controlled to be about 12. , stirring until the waste water after the reaction is completed enters...

Embodiment 3

[0052] A specific embodiment for the treatment of arsenic-containing wastewater discharged from the sulfuric acid workshop of a copper smelter. The treatment capacity of arsenic-containing wastewater is 10m3 / h, the acid concentration is 6%, and the arsenic (As) content of the wastewater reaches 3.5g / L. The steps for processing in this method are as follows:

[0053] (1) Precipitation of sulfate radicals: add milk of lime to the arsenic-containing wastewater to adjust the pH value, adjust the pH to about 1.5, separate solid-liquid to obtain gypsum and arsenic-containing wastewater, and take out the gypsum after pressure filtration;

[0054] (2) Oxidation precipitation: Add lime milk and Fenton's reagent to the arsenic-containing wastewater adjusted in the previous step. The molar ratio of Fenton's reagent to the arsenic content in the treated wastewater is 2, and the pH of the reaction is controlled to be about 11. , stirring until the waste water after the reaction is complete...

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Abstract

The invention discloses a coupling process method for high-concentration arsenic acidic wastewater. The coupling process method comprises the steps of (1) precipitating sulfate radical; (2) performing oxidation precipitation; (3) performing settling separation by a primary sloping panel; (4) performing oxidation and stirring; (5) performing settling separation by a secondary sloping panel; (6) coagulating an iron salt; and (7) performing air floating separation. The coupling process method has the advantages that yielding water is stable and easy to reach the standard, the agent dosage is small, the operation cost is low, the slag discharging amount is small, and arsenic slag can be cured effectively.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a coupled treatment method for acidic high-arsenic wastewater produced in the nonferrous smelting industry. Background technique [0002] Sulfuric acid production in smelters usually discharges a large amount of arsenic-containing wastewater. Arsenic and its compounds are highly toxic and carcinogenic substances. Once arsenic pollution to the environment is caused, it will be cumulative and irreversible. If it is not controlled, it will easily It will cause damage to the environment and ecology, and cause great harm to human health. In recent years, the serious harm caused by arsenic-containing wastewater has become increasingly prominent, and the world has begun to pay more attention to the problem of arsenic environmental pollution. It is imminent to research and develop an efficient and economical arsenic-containing wastewater treatment technology. [0003] At present, the main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/20
Inventor 张生祥夏启斌陈荔马力
Owner SHENZHEN MINGDENG TECH
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