Apparatus and method for processing chlorine-containing organic wastewater by electrochemical reduction and oxidation

An electrochemical, horizontal placement technology, applied in the field of electrochemistry and environment, can solve the problem of not taking too much consideration, and achieve the effect of avoiding incomplete dechlorination and detoxification, reducing secondary pollution and saving costs.

Inactive Publication Date: 2009-05-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research on electrochemical dechlorination technology focuses on separating chlorine atoms from the parent str

Method used

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  • Apparatus and method for processing chlorine-containing organic wastewater by electrochemical reduction and oxidation
  • Apparatus and method for processing chlorine-containing organic wastewater by electrochemical reduction and oxidation
  • Apparatus and method for processing chlorine-containing organic wastewater by electrochemical reduction and oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The experiment compared the difference of 4-chlorophenol conversion rate, COD removal effect and dechlorination rate under the combination of electrochemical reduction and oxidation, and electrochemical oxidation.

[0044] Ti / IrO is used in both processes 2 / RuO 2 For the anode, an organic synthetic filter membrane is placed in the electrolytic cell as a diaphragm, and the waste water degradation effect is sampled and measured in batches in batches. The treatment conditions are that the waste water contains 100 mg / L of 4-chlorophenol concentration, the volume of the waste water is 100 mL, the current is 1.1 A, and the electrolyte ( Na 2 SO 4 ) concentration is 0.1mol / L, and the aeration rate is 25mL / s.

[0045] (1) In the combined process of electrochemical reduction and oxidation, the palladium-loaded gas diffusion electrode is used as the cathode for degradation tests. Hydrogen gas is fed in the early stage of electrolysis, and air is fed in the later stage of elec...

Embodiment 2

[0052] Press the reactor of example 1, adopt electrochemical reduction and oxidation to combine treatment pentachlorophenol waste water, adopt Ti / IrO 2 / RuO 2 The anode and the palladium-loaded gas diffusion electrode are used as the cathode, and an organic synthetic filter membrane is placed in the electrolytic cell as a diaphragm for degradation tests. The degradation effect of wastewater is sampled and measured in batches. Wastewater volume 100mL, current 1.1A, electrolyte (Na 2 SO 4 ) concentration of 0.1mol / L, hydrogen was introduced in the early stage of electrolysis, air was introduced in the later stage of electrolysis, and the aeration rate was 25mL / s. The results are shown in Table 2.

[0053] Table 2 Combined electrochemical reduction and oxidation treatment of pentachlorophenol wastewater

[0054]

[0055] It can be seen that the combined process of electrochemical reduction and oxidation has a better effect on treating pentachlorophenol wastewater. After 3 h...

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Abstract

The invention discloses a device and a method used for processing chlorine-containing organic wastewater by combining electrochemical reduction with oxidation, which belongs to the electrochemical and environmental technical field. An electrolyzer body is positioned horizontally, the diffusion cathode and the diffusion anode of palladium-loading gas are separately positioned at the two sides of the electrolyzer body, one side of the cathode is connected with a gas compartment, a diaphragm is arranged between the cathode and the anode so as to separate the cathode area and the anode area, an air inlet pipe is arranged at one side of the gas compartment, and the exhaust pipes of the cathode area and the anode area are respectively arranged at the upper parts of the cathode area and the anode area, wherein, the exhaust pipe arranged at the upper part of the anode area is connected with a gas absorption device. The diffusion cathode of the palladium-loading gas not only can electroreduce and dechlorinate chlorinated organic compounds (by pumping in hydrogen), but also can produce hydrogen peroxide by electroreduction (by pumping in air), and also can be decomposed to generate hydroxyl radical. The device has simple structure, processes the chlorine-containing organic wastewater by adopting electrochemical reduction and dechlorination to the cathode and simultaneous adopting electro-catalytic oxidation to both the cathode and the anode, thus achieving the aims of removing pollutants fully, reducing energy consumption and increasing decontamination efficiency.

Description

technical field [0001] The invention relates to a device and a method for electrochemically treating chlorine-containing organic wastewater, and belongs to the technical field of electrochemistry and environment. Background technique [0002] Chlorinated organic compounds (especially low-carbon chlorinated organic compounds) have been proved by the scientific community to have "carcinogenic, teratogenic, mutagenic" effects or suspicious "three-effects" at trace concentrations. Chlorinated organics, especially polychlorinated organics wastewater, is highly toxic and difficult to degrade, and it is difficult to remove it with traditional biological methods. It has been the pursuit of economical, efficient, thorough, no secondary pollution, and suitable for industrial applications that researchers have spared no effort to pursue. goals and themes. [0003] In recent years, the research on the removal of organic matter in wastewater by electrochemical technology has been increa...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72
Inventor 王建龙王辉胡俊
Owner TSINGHUA UNIV
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