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Method and device for treating cyanide-containing wastewater through photoelectrochemistry

A photoelectrochemical, cyanide wastewater technology, applied in chemical instruments and methods, oxidized water/sewage treatment, light water/sewage treatment, etc., can solve the problems of low reaction tank efficiency, easy passivation, unstable electrodes, etc. And the effect of simple maintenance, small installed capacity and small footprint

Inactive Publication Date: 2011-06-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In summary, the electrochemical treatment of cyanide-containing wastewater has problems such as low reaction tank efficiency, unstable electrodes and easy passivation.

Method used

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  • Method and device for treating cyanide-containing wastewater through photoelectrochemistry
  • Method and device for treating cyanide-containing wastewater through photoelectrochemistry

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Embodiment 1

[0058] The method and device for treating cyanide-containing wastewater described in the present invention are used to treat certain cyanide-containing electroplating comprehensive wastewater. The concentration of cyanide in wastewater is 15.8mg / L, Cu 2+ Concentration 10.1mg / L, Ni 2+ The ion concentration is 0.8mg / L, and the pH is 0.8. Firstly, the pH value of the wastewater was adjusted to 10.5, and then the photoelectric oxidation reaction was carried out. The volume of the reaction tank is 15L, and the apparent current density is 4A / m 2 , the UV light intensity is 10mW / cm 2 . The concentration of added sodium chloride is 2g / L, the residence time of wastewater in the photoelectric reaction system is 15 minutes, the concentration of cyanide in wastewater after treatment is 0.33mg / L, Cu 2+ The concentration is 0.1mg / L, Ni 2+ The ion concentration is 0.15 mg / L and the pH is 7.8.

Embodiment 2

[0060] The method and device for treating cyanide-containing wastewater described in the present invention are used to treat cyanide-containing and copper-containing wastewater generated during the production process of an electroplating plant. The concentration of cyanide in wastewater is 30.7mg / L, Cu 2+ Concentration 20.5mg / L, pH 1.2. Firstly, the pH value of the wastewater was adjusted to 10.3, and then the photoelectric oxidation reaction was carried out. The volume of the reaction tank is 15L, and the apparent current density is 5A / m 2 , the UV light intensity is 30mW / cm 2 . The concentration of added sodium chloride is 2.5g / L, the residence time of wastewater in the photoelectric reaction system is 20 minutes, the concentration of cyanide in wastewater after treatment is 0.21mg / L, Cu 2+ The concentration is 0.08mg / L, and the pH is 7.8.

[0061] The invention effectively removes the cyanide in water through electrochemical anode direct oxidation, photocatalytic oxida...

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Abstract

The invention discloses a method for treating cyanide-containing wastewater through photoelectrochemistry, which comprises the following steps of: regulating the pH value of the cyanide-containing wastewater to be more than 10, adding NaCl, electrolyzing under the radiation of ultraviolet, and regulating the pH value of the effluent to be 7-9 to ensure that cyanides meet the standard. A device used for implementing the method comprises a reaction tank; the bottom on one side of the reaction tank is provided with a water inlet, and the bottom on the other side of the reaction tank is provided with a water outlet; anode plates and cathode plates are inserted in the reaction tank at intervals, all the anode plates are connected in series, and all cathode plates are connected in series; and an ultraviolet lamp is arranged between each anode plate and each cathode plate. The cyanides in water are effectively removed through functions such as electrochemical anode direct oxidation, photocatalytic oxidation, active chlorine oxidation, ultraviolet radiation of active chlorine to generate chlorine radicals and hydroxyl radicals and the like. Meanwhile, heavy metal ions in the cyanide-containing wastewater are deposited on cathodes in the electrochemical reaction process, and are removed and recycled; and organic matters in the cyanide-containing wastewater are effectively degraded and removed.

Description

technical field [0001] The invention belongs to the technical field of electrochemical wastewater treatment, and in particular relates to a method for treating cyanide-containing wastewater by photoelectrochemistry. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] Cyanide is a highly toxic substance. Cyanide mainly comes from electroplating wastewater, coke oven and blast furnace gas washing wastewater and cooling water, some chemical wastewater and mineral processing wastewater, etc. Cyanide-containing wastewater is discharged directly without treatment, which seriously pollutes the external water environment. The carbon-nitrogen triple bond in cyanide has a certain reactivity, and it is easy to react with oxidants and break. For cyanide-containing wastewater with low concentration and no recovery value, cyanide is generally removed by oxidative destruction. Commonly used oxidants include chlorine, hypochlorit...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72C02F1/76C02F1/32C02F101/18
Inventor 曲久辉赵旭刘会娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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