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

Active Publication Date: 2021-07-06
WENZHOU UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems that the above-mentioned prior art is easy to accumulate hexavalent chromium and the steps of removing Cr are relatively complicated, the present invention designs a method for treating organic complexed chromium waste water and synchronously controlling A method for generating hexavalent chromium, the invention uses H2O2 electrogenerated by carbon-based materials to cooperate with O3 to efficiently break down the organic complex state At the same time, the formation of hexavalent chromium is jointly controlled by multiple functions such as electrogenerated H2O2 reduction, cathodic electroreduction and anode electrosorption, thereby greatly reducing the The accumulation of Cr(VI) reduces the generation of chrome sludge hazardous waste, greatly reduces the treatment cost, and realizes the green treatment of organic complex chromium wastewater

Method used

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

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Embodiment 1

[0055] A method of treating organic complexed chromium wastewater and synchronously controlling the generation of hexavalent chromium in this embodiment uses tap water to prepare Cr-EDTA wastewater with a concentration of 0.2mmol / L, adjusts pH to 3±0.02 by HCl / NaOH, and current density 15mA / cm 2 , the dosage of ozone is 7.4mg / L, the self-made cathode and anode electrodes are 5×8cm titanium mesh, the material covering the titanium mesh is 5×8cm activated carbon fiber, and the self-made cathode and anode are Ti / IrO 2 Combined with carbon fiber, the aeration flow rate is 0.5L / min, and the reaction time is 120min.

[0056] Experimental results: if figure 1 As shown, after 120 minutes of reaction, the total chromium was reduced to 1.35 mg / L, the concentration of Cr(VI) was 0.22 mg / L, and the removal rate of total organic carbon (TOC) was 73%.

[0057] It can be seen from the experimental results that the residual concentration of total chromium in the solution is lower than 1.5 m...

Embodiment 2

[0059] A method of treating organic complexed chromium wastewater and synchronously controlling the generation of hexavalent chromium in this embodiment is to prepare three parts of Cr-EDTA wastewater with tap water at a concentration of 0.2mmol / L, and adjust the pH to 3±0.02 by HCl / NaOH. The current density is respectively 10, 15, 20mA / cm 2 , the dosage of ozone is 7.4mg / L, the self-made cathode and anode electrodes are 5×8cm titanium mesh, the material covering the titanium mesh is 5×8cm activated carbon fiber, the self-made anode is a combination of Ti and carbon felt, and the self-made cathode is stainless steel Combined with graphite felt, the aeration flow rate is 0.5L / min, and the reaction time is 120min.

[0060] Experimental results: the current density is 10mA / cm 2 After 120 minutes of reaction, the total chromium in the solution was reduced to 3.25mg / L, Cr(VI) was generated to 0.75mg / L, and the removal rate of TOC was 77%; the current density was 15mA / cm 2 After 1...

Embodiment 3

[0063] A method of treating organic complexed chromium wastewater and synchronously controlling the generation of hexavalent chromium in this embodiment is to prepare three parts of Cr-EDTA wastewater with tap water at a concentration of 0.2mmol / L, and adjust the pH to 3±0.02 by HCl / NaOH. The current density is 15mA / cm 2 , the dosage of ozone is 2.4, 7.4, 15.6mg / L respectively, the self-made cathode and anode electrodes are 5×8cm titanium mesh, the material covering the titanium mesh is 5×8cm activated carbon fiber, the self-made anode is Pt and mesh glass Combination of Carbon, Homemade Cathode as TiO 2 Combined with PTFE carbon, the aeration flow rate is 0.5L / min, and the reaction time is 120min.

[0064] Experimental results: the dosage of ozone is 2.4mg / L, after 120 minutes of reaction, the total chromium in the solution is reduced to 2.80mg / L, Cr(VI) is generated to 0.05mg / L, and the removal rate of TOC reaches 67%. After 120 minutes of reaction, the total chromium in t...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467C02F101/22
CPCC02F1/4678C02F1/4672C02F1/46109C02F2001/46138C02F2101/22Y02P10/20
Inventor 黄先锋陈聪王贝贝田海龙孙博刘仁兰郑向勇赵敏
Owner WENZHOU UNIVERSITY
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