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Method for treatment and cyclic utilization of sulfuric acid waste water containing heavy metal

A technology for wastewater treatment and heavy metals, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems that wastewater cannot be recycled, sulfuric acid wastewater treatment is achieved, and the operation is not stable enough , to achieve stable operation, avoid fouling, and high treatment efficiency

Inactive Publication Date: 2014-07-16
XIANGTAN UNIV
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Problems solved by technology

The above-mentioned traditional sulfuric acid wastewater treatment method is difficult to meet the "Sulfuric Acid Industrial Pollutant Discharge Standard" (GB26132-2010) due to the unstable operation and the inability to recycle the treated wastewater.

Method used

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  • Method for treatment and cyclic utilization of sulfuric acid waste water containing heavy metal

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Embodiment Construction

[0027] The technological process of the inventive method sees figure 1 . Heavy metal-containing sulfuric acid wastewater 1 (containing H 2 SO 4 4.37%, As 39.1mg / L, Pb 5.4mg / L, F 102.6mg / L) into the machine mixing reaction tank A, add lime 2 under mechanical mixing for treatment, the treatment time is 15 (or 10, 20) minutes, The pH value is 11.4 (or 11.0, 12.0), so that the fluorine in the wastewater produces calcium fluoride precipitation; the effluent from the machine-mixed reaction tank A enters the aeration reaction tank B, and the Fe / As molar ratio is 4 (or 6, 8 ) by adding ferrous sulfate 3 and compressed air 4 for treatment, the treatment time is 30 (or 20, 40) minutes, the pH value is 11.1 (or 10.5, 11.5), so that the ferrous iron in the wastewater is oxidized to ferric iron , arsenic produces ferric arsenate and ferric arsenite precipitation, and lead produces flocculation precipitation; the effluent from the aeration reaction tank B enters the filter press C to fi...

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Abstract

The invention discloses a method for treatment and cyclic utilization of sulfuric acid waste water containing heavy metal. The method for treatment and cyclic utilization of the sulfuric acid waste water containing the heavy metal comprises the steps that (1) the sulfuric acid waste water containing the heavy metal enters a mechanical mixing reaction tank, neutralization reaction is conducted between the sulfuric acid waste water containing the heavy metal and excess lime slurry under mechanical mixing; (2) water discharged out of the mechanical mixing reaction tank enters an aeration reaction tank, ferrous sulfate is added into the aeration reaction tank and compressed air is introduced into the aeration reaction tank, and then aeration reaction is conducted; (3) water discharged out of the aeration reaction tank enters a pressure filter to be filtered; (4) water filtered through the pressure filter enters a secondary reaction tank, and the filtered water is treated continuously by adding ferrous sulfate into the secondary reaction tank and introducing compressed air into the secondary reaction tank; (5) water discharged out of the secondary reaction tank enters a carbon dioxide decalcification reaction tank, and treatment such as aeration is conducted through compressed air containing carbon dioxide. The method for treatment and cyclic utilization of the sulfuric acid waste water containing the heavy metal has the advantages that the treatment efficiency is high, operation is stable, emission is reduced, and cyclic utilization can be achieved. By the adoption of the method for treatment and cyclic utilization of the sulfuric acid waste water containing the heavy metal, treatment of the sulfuric acid waste water containing the heavy metal can meet the requirements of the sulfuric acid industrial pollution discharge standard (GB26132-2010).

Description

technical field [0001] The invention belongs to a method for treating sulfuric acid wastewater containing heavy metals, in particular to a method for treating and recycling sulfuric acid wastewater containing heavy metals. Background technique [0002] The sulfuric acid wastewater containing arsenic, lead, fluorine and other pollutants discharged from pyrite acid production process is a complex wastewater with high toxicity and high environmental risk (hereinafter referred to as sulfuric acid wastewater). The traditional sulfuric acid wastewater treatment method is to use lime slurry (or calcium carbide slag), ferrous sulfate and compressed air to neutralize and aerate the sulfuric acid wastewater in a reaction tank, so that the arsenic, lead, fluorine and other pollutants in it form sediments , and then let the wastewater enter the sedimentation tank for precipitation; generally through such two-stage "reaction-sedimentation" treatment, the effluent is discharged after adju...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10
Inventor 黄力群黄玉林
Owner XIANGTAN UNIV
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