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Electrochemical reactor and method for removing coexisting high-calcium and high-chloride ions from wastewater

A reactor and electrochemical technology, applied in the field of environmental pollution control, can solve the problems of unsuitable wastewater with high chloride ion content, easy passivation and deactivation of electrodes, complicated electrolysis devices, etc. Controlling effect

Inactive Publication Date: 2017-10-27
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problems in the prior art that the cost is high, the adsorbent is easy to absorb and saturate, the adsorption time is long, the electrode is easily passivated and deactivated, the electrolysis device is complicated, and it is not suitable for wastewater with high chloride ion content.

Method used

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  • Electrochemical reactor and method for removing coexisting high-calcium and high-chloride ions from wastewater

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Experimental program
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Effect test

Embodiment 1

[0037] Prepare simulated wastewater with an initial concentration of chloride ions of 1000 mg / L and an initial concentration of calcium ions of 8000 mg / L with sodium chloride and calcium oxide, introduce the simulated wastewater to be treated into the reaction tank of the electrochemical reactor, and make the anode and The cathode is immersed in the waste water, a constant current is applied between the cathode and the anode, and the waste water is continuously stirred. The power supply used in the reaction process is a DC power supply, the voltage is 5 volts, the current is 2 amps, and the reaction temperature is 20°C. After 2 hours of electrification, the chloride ion concentration dropped to 290mg / L, and the calcium ion concentration dropped to 6000mg / L.

Embodiment 2

[0039] Sodium chloride and calcium oxide are used to prepare simulated wastewater with an initial concentration of chloride ions of 2000 mg / L and an initial concentration of calcium ions of 4000 mg / L. The simulated wastewater to be treated is introduced into the reaction tank of the electrochemical reactor to make the anode and The cathode is immersed in the waste water, a constant current is applied between the cathode and the anode, and the waste water is continuously stirred. The power supply used in the reaction process is a DC power supply, the voltage is 5 volts, the current is 2 amps, and the reaction temperature is 20°C. After 4 hours of electrification, the chloride ion concentration dropped to 745.71mg / L, and the calcium ion concentration dropped to 1180mg / L.

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Abstract

The invention discloses an electrochemical reactor and a method for removing coexisting high-calcium and high-chloride ions from wastewater. The electrochemical reactor comprises one or more reaction tanks; anodes and cathodes are alternately placed in the reaction tank; aluminum electrodes are served as the anodes; inert electrodes are served as the cathodes. The method comprises the following steps: introducing the to-be-treated wastewater into the reaction tank of the electrochemical reactor, soaking the anodes and the cathodes in the wastewater, applying constant current between the anodes and the cathodes and continuously stirring the wastewater. According to the invention, no drug is additionally added, the possibility of causing secondary pollution is low, the reaction condition is mild and the method is not limited by the scope of the chloride ion concentration, and meanwhile, the device used for reacting is simple, the cost is lower and the realization for automation is benefited.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and more specifically relates to an electrochemical reactor and a method for removing high-calcium and high-chloride ions coexisting in wastewater. Background technique [0002] The concentrations of calcium ions and chloride ions in the desulfurization and denitrification wastewater in production are very high. The wastewater discharged from industrial production often has the characteristics of high chloride, high calcium and high COD, such as gelatin wastewater. The treatment of such wastewater has always been a problem. Activated sludge method is one of the most commonly used methods for wastewater treatment at present, which has the characteristics of high efficiency, economy and strong adaptability. The cost of using other methods to treat high-chloride and high-calcium wastewater is relatively high, and it is not convenient for large-scale promotion. However, high concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/00C02F1/461C02F1/463C02F1/465C02F1/467
CPCC02F1/46104C02F1/46109C02F1/463C02F1/465C02F1/467C02F5/00C02F2303/08
Inventor 王又容程四清杜传青郑立辉
Owner WUHAN POLYTECHNIC UNIVERSITY
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