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Process for treating sewage by bipolar oxidizing and electrochemical method

A waste water treatment and electrochemical technology, applied in the direction of electrochemical water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as internal friction, complex cathode structure, etc., to improve treatment efficiency and reduce treatment energy consumption , low cost effect

Inactive Publication Date: 2003-02-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of the cathode in this patent is complex, and the cathode and anode are not separated in a certain way, so that the hydrogen peroxide produced by the reduction of oxygen at the cathode diffuses to the anode in the reactor and is oxidized into oxygen again, resulting in a large number of simple internal frictions

Method used

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  • Process for treating sewage by bipolar oxidizing and electrochemical method
  • Process for treating sewage by bipolar oxidizing and electrochemical method

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Embodiment 1

[0017] The technical solutions of the present invention will be further described below in conjunction with specific embodiments. Embodiment 1: the decolorization effect of bipolar oxidation

[0018] The membrane electrode of this embodiment is prepared by using graphite fiber as the conductive and supporting framework, carbon black as the diffusion layer and Pt element as the catalytic material. The membrane electrode is used as the cathode, the graphite electrode is used as the anode, and the saturated potassium sulfate is used as the salt bridge to connect the anode area and the cathode area. Electrolyzed acid red B is made into a certain concentration of simulated wastewater and 0.005M sodium sulfate as the dielectric, with a voltage of 8V, and the gas flow per square meter of the membrane electrode is 36m 3 / hr, samples were taken and analyzed at different reaction times, the absorbance was measured at 510nm, and the treatment effect under different pH conditions.

[00...

Embodiment 2

[0023] pH=10 45.2 3.5 Example 2: Current efficiency of bipolar oxidation

[0024] In this embodiment, graphite fiber is used as the conductive and supporting framework, carbon black is used as the diffusion layer, and a membrane electrode is prepared as the cathode. Ti / PbO 2 The electrode is the anode, and the cation exchange membrane is the separator. Electrolyzed Acid Red B to make a certain concentration of simulated wastewater, and control the current density to 1.0-3.0mA / cm 2 , the ventilation rate per square meter membrane electrode is 20m 3 / hr, samples were taken and analyzed at different reaction times, and the COD values ​​of the cathode area and the anode area were measured before and after treatment.

[0025] COD removal rate current efficiency (%)

[0026] Voltage (V) Current mA (%)

[0027] Anode area 10.0 58 56.2 66.4

[0028] Cathode area 10.0 58 66.8 78.9

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Abstract

A dual-electrode oxidizing and electrochemical process for treating the industrial sewage is discloosed. A 3D membrane gas-diffusion electrode is used as the electrolytic cathode. An ion exchange membrane or a salt bridge is used to partition the cathode area from the anode area. The electrically catalytic electrolysis is performed to generate H2O2 which can be used to decompose the organic pollutants. Its advantages are high efficiency and low energy consumption.

Description

Technical field: [0001] The invention relates to an electrochemical wastewater treatment method, in particular to a bipolar oxidation electrochemical wastewater treatment method using a membrane gas diffusion electrode, and belongs to the technical field of environmental protection and energy saving. Background technique: [0002] The electrochemical method of wastewater treatment has many unique features, such as: flexible combination with other technologies, no need to add oxidants, flocculants and other chemicals for sewage treatment, small equipment, small footprint, simple and flexible operation, small equipment investment, etc. Advantages, is now a hot spot in the field of water pollution control at home and abroad. However, electrochemical technology has always had the problem of high energy consumption. In the usual electrochemical method to treat organic wastewater electrolysis, the anodic oxidation method is mainly used. That is to make the organic matter oxidize...

Claims

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Application Information

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IPC IPC(8): C02F1/46
Inventor 申哲民王文华贾金平
Owner SHANGHAI JIAO TONG UNIV
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