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Method for electric flocculation treatment of heavy metal wastewater

A technology of electrocoagulation and heavy metals, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as cumbersome process flow, secondary pollution, and complicated operation

Inactive Publication Date: 2015-12-23
BEIJING JINGRUN NEW TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the secondary pollution, high cost, cumbersome process flow, complicated operation, unsatisfactory treatment effect of single electrocoagulation technology and During the treatment process, due to the addition of other substances to cause water pollution and other problems, the invention provides a method for electrocoagulation treatment of low-concentration heavy metal wastewater

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0054] Adopt method of the present invention to process copper-containing heavy metal wastewater, wherein Cu 2+ The concentration is 20mg / L.

[0055] First carry out the electrocoagulation reaction for 30 minutes, then adjust the pH of the heavy metal wastewater to 7, and add sodium sulfide according to the molar ratio of sulfur ions and divalent heavy metal cations at 5:1, wherein, in the electrocoagulation reaction, a DC power supply or a low-voltage pulse power supply is used to control the electrode Control the voltage of each pair of electrodes to 30V, and the current density on the electrode plate is 10mA / cm 2 , The electrode spacing is 20mm. After aeration treatment for 4 minutes, filter to obtain effluent.

[0056] After the electrocoagulation reaction was completed, the Cu in the effluent was measured 2+ The concentration is 0.005mg / L, and the sulfide content is less than 0.1mg / L, which meets the discharge standard.

Embodiment 2

[0058] Adopt method of the present invention to process cadmium-containing heavy metal wastewater, wherein Cd 2+ The concentration is 10mg / L.

[0059] First carry out the electrocoagulation reaction for 30 minutes, then adjust the pH of the heavy metal wastewater to 8, and add potassium sulfide according to the molar ratio of sulfide ions and divalent heavy metal cations as 4:1, wherein, the electrocoagulation reaction adopts a DC power supply or a low-voltage pulse power supply to control the electrode Control the voltage of each pair of electrodes to 20V, and the current density on the electrode plate is 8mA / cm 2 , The electrode spacing is 30mm. After aeration treatment for 4 minutes, filter to obtain effluent.

[0060] After the electrocoagulation reaction is completed, the Cd in the effluent is measured 2+ The concentration is 0.015mg / L, and the sulfide content is less than 0.1mg / L, which meets the discharge standard.

Embodiment 3

[0062] Adopt method of the present invention to process nickel-containing heavy metal wastewater, wherein Ni 2+ The concentration is 5mg / L.

[0063] First carry out the electrocoagulation reaction for 30 minutes, then adjust the pH of the heavy metal wastewater to 8, and add sodium hydrosulfide according to the molar ratio of sulfide ions and divalent heavy metal cations as 3:1; wherein, the electrocoagulation reaction is controlled by a DC power supply or a low-voltage pulse power supply Electrode control The voltage of each pair of electrodes is 20V, and the current density on the electrode plate is 20mA / cm 2 , The electrode spacing is 20mm. After aeration treatment for 4 minutes, filter to obtain effluent.

[0064] After the electrocoagulation reaction is completed, the Ni in the effluent is determined 2+ The concentration is 0.02mg / L, and the sulfide content is less than 0.1mg / L, which meets the discharge standard.

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Abstract

The invention provides a method for electric flocculation treatment of heavy metal wastewater. The method comprises the following steps: firstly, performing electrocoagulation, wherein metal ions (such as iron ions or zinc ions) generated by electrolysis are combined with a sulfide to form a coagulation source, the generated sulfide and heavy metal ions are subjected to displacement reaction to deposit other heavy metal ions at the same time, and moreover, hydrolysis can generate a large amount of multi-hydroxyl compounds which are subjected to enrichment effects of reaction, adsorption and chelating with low-concentration heavy metal ions; secondly, adjusting the pH value, and adding the sulfides which can achieve a synergistic action with electric flocculation to remove heavy metals; and finally, aerating for a period of time, and filtering to drain off water. The method provided by the invention can ensure that the content of the heavy metals in effluent is lower and can meet discharge standards; and meanwhile, the method is high in treatment efficiency and is pollution-free, and the used equipment is simple, occupies a small floor area and is convenient to operate.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a method for electrocoagulation treatment of heavy metal wastewater, in particular to a method for electrocoagulation treatment of low-concentration heavy metal wastewater. Background technique [0002] Heavy metal wastewater refers to industrial wastewater containing heavy metal ions such as chromium, cadmium, nickel, and lead. Machinery processing industry, mining smelting industry and some chemical enterprises will produce heavy metal wastewater in the production process. After various preliminary treatments, the concentration of heavy metal ions in this wastewater is less than 50mg / L, but this low concentration of heavy metal wastewater has not yet reached the national level. If discharged directly, it will cause water pollution, and through soil, water and air, especially through the food chain, it will directly cause serious harm to human health. Therefore, the purification t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/463
Inventor 肖东殷进陈宝生苗远郭晓辉金志娜
Owner BEIJING JINGRUN NEW TECH DEV
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