Method for treating organic complex chromium wastewater and synchronously controlling generation of hexavalent chromium

An organic complexation and synchronous control technology, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of easily accumulating hexavalent chromium to remove Cr, reduce treatment costs, and cumbersome, etc. question
CN113072142AActive Publication Date: 2021-07-06WENZHOU UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WENZHOU UNIVERSITY
Publication Date
2021-07-06

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Abstract

The invention discloses a method for treating organic complex chromium wastewater and synchronously controlling generation of hexavalent chromium, and belongs to the field of wastewater treatment. The method comprises the following steps: adding a trivalent chromium-containing complexing simulation solution or wastewater with adjusted pH into a reaction container, inserting a prepared anode and cathode into a reaction solution, and switching on a power supply; continuously aerating a mixed gas of O2 and O3 into the reaction container through a microporous aeration head, and carrying out hydraulic stirring while aerating to ensure that the reaction is carried out uniformly; and after the reaction is carried out for 30-120 minutes, depositing / adsorbing chromium on the cathode and anode materials. While the organic complex chromium is efficiently cracked by utilizing H2O2 generated by the carbon-based material in cooperation with O3, the generation of hexavalent chromium is controlled through the combination of multiple actions such as electrogenerated H2O2 reduction, cathode electroreduction and anode electroadsorption, and finally the chromium is transferred to the electrode material in an electrodeposition or electroadsorption manner, so that the accumulation of Cr (VI) is greatly reduced, the generation of chromium sludge hazardous wastes is reduced, The treatment cost is greatly reduced, and green treatment of the organic complex chromium wastewater is realized.
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Description

technical field

[0001] The invention relates to the field of industrial wastewater treatment, and more particularly relates to a method for treating organic complexed chromium wastewater and synchronously controlling the generation of hexavalent chromium. Background technique

[0002] Chromium is an important raw material for the production of many industrial products. During the production and use of chromium-containing products, chromium-containing wastewater will be generated. Chromium, especially hexavalent chromium, is very toxic. If the wastewater containing chromium is not treated and discharged into the environment, it will cause serious environmental pollution.

[0003] Due to the widespread use of trivalent chromium (Cr(III)) compounds in electroplating, tanning, and printing and dyeing industries, a large amount of Cr(III)-containing wastewater is generated. At the same time, a large amount of organic complexing agents, such as EDTA, NTA, citric acid, etc., coe...

Claims

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