Treatment method for high-concentration arsenic waste water

A treatment method and high-concentration technology, applied in flotation water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of harsh working environment, high operating costs, and low degree of automation of treatment processes, etc. problem, to achieve the effect of reducing the amount of arsenic slag

Active Publication Date: 2013-04-10
深圳市明登科技有限公司
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Problems solved by technology

[0005] However, there are obvious deficiencies in the above-mentioned chemical precipitation methods. First, the lime precipitation method, the iron salt precipitation method, and the iron salt-lime co-precipitation method need to add a large amount of chemical agents, which are precipitated in the form of precipitates, resulting in a large amount of arsenic. Toxic waste residues have secondary pollution problems; second, th

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  • Treatment method for high-concentration arsenic waste water

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Embodiment 1

[0033] The present invention is aimed at the specific embodiment of the application of the arsenic-containing wastewater discharged from the sulfuric acid workshop of the copper smelter, and the treatment capacity of the arsenic-containing wastewater is 10m 3 / h, the acid concentration is 6%, and the waste water arsenic (As) content reaches 4.3g / L; Adopt the inventive method to carry out process flow (as figure 1 shown) as follows:

[0034] (1) In the first stage of pH neutralization adjustment, the pH is adjusted by adding lime milk to the arsenic-containing wastewater, and the pH is adjusted to 2, and solid-liquid separation is performed to obtain gypsum and arsenic-containing wastewater.

[0035] (2) Oxidation precipitation (I), add lime milk mixed reaction to the arsenic-containing wastewater after the neutralization of the first section and add calcium hypochlorite simultaneously, control the reaction pH end point value to be 10, after the stirring reaction is completed, ...

Embodiment 2

[0041]The present invention is aimed at the specific embodiment of the application of the arsenic-containing wastewater discharged from the sulfuric acid workshop of the copper smelter, and the treatment capacity of the arsenic-containing wastewater is 10m 3 / h, acid concentration is 6%, and waste water arsenic (As) content reaches 4.9g / L; Adopt the inventive method to carry out process flow (as figure 1 shown) as follows:

[0042] (1) In the first stage of pH neutralization adjustment, the pH value is adjusted by adding milk of lime to the arsenic-containing wastewater, the pH is adjusted to 3, and solid-liquid separation is performed to obtain gypsum and arsenic-containing wastewater.

[0043] (2) Oxidation precipitation (I), add lime milk mixed reaction to the arsenic-containing waste water after the neutralization of the first section and add calcium hypochlorite simultaneously, control the reaction pH end point value to be 12, after the stirring reaction is completed, the...

Embodiment 3

[0049] The present invention is aimed at the specific embodiment of the application of the arsenic-containing wastewater discharged from the sulfuric acid workshop of the copper smelter, and the treatment capacity of the arsenic-containing wastewater is 10m 3 / h, acid concentration is 8%, and waste water arsenic (As) content reaches 5.3g / L; Adopt the inventive method to carry out process flow (as figure 1 shown) as follows:

[0050] (1) In the first stage of pH neutralization adjustment, the pH value is adjusted by adding milk of lime to the arsenic-containing wastewater, and the pH is adjusted to 3, and solid-liquid separation is performed to obtain gypsum and arsenic-containing wastewater.

[0051] (2) Oxidation precipitation (I), add lime milk mixed reaction to the arsenic-containing wastewater after the neutralization of the first section and add chlorine dioxide simultaneously, control the reaction pH end point value to be 11, after the stirring reaction is completed, the...

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Abstract

The invention discloses a treatment method for high-concentration arsenic waste water, and relates to the technical field of sewage treatment. The method comprises the following steps of: 1, carrying out pH neutralization adjustment, and executing solid-liquid separation after neutralization; 2, oxidizing sedimentation (I): treating the arsenic waste water with an alkaline coagulant, then, executing oxidization, and carrying out inclined plate settling to realize solid-liquid separation; 3, oxidizing sedimentation (II): adding lime or lime milk in the neutralized waste water, executing oxidization simultaneously, and carrying out inclined plate settling to realize solid-liquid separation; 4, ferric salt coagulation: adding an inorganic coagulant in water solution, stirring, and then, adding an organic flocculant; and 5, air floatation separation: adding a surface active agent, separating iron and arsenic slag, executing pressure filtration and drying, and carrying out oxidizing roasting. The method has the beneficial effect that the effluent As concentration of the treated waste water can meet the national emission standard; the As concentration of the leach liquor of the oxidized and roasted arsenic waste residue buried underground is far below the national stipulated limit, and arsenic is cured effectively.

Description

【Technical field】 [0001] The invention relates to a treatment technology for industrial arsenic-containing wastewater, in particular to a treatment method for high-concentration arsenic-containing wastewater. 【Background technique】 [0002] The high-sulfur flue gas produced in the non-ferrous smelting process can be used to make acid. The acid-making process will produce a large amount of dirty acid wastewater. This type of wastewater usually has high acid concentration, high turbidity, and contains arsenic, fluorine, lead, zinc, mercury, and copper. , cadmium and other harmful elements, especially the high arsenic content, sometimes even as high as 20g / L, far exceeding the national emission standard of 0.5mg / L; arsenic and its compounds are carcinogens with high toxicity, so if not It is very easy to cause pollution to the environment, and once the pollution is formed, it is difficult to eliminate, especially once the arsenic pollutes the water body and soil, it will enter ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/72C02F1/24C02F101/20
Inventor 张生祥夏启斌陈荔马力
Owner 深圳市明登科技有限公司
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