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Method for degrading azo dye wastewater by activating persulfate through bioelectricity

A technology for activating persulfate and azo dyes, applied in chemical instruments and methods, biological water/sewage treatment, electrochemical-biological combined treatment, etc. , secondary pollution and other problems, to achieve the effect of avoiding secondary pollution, simple reaction system and high environmental protection requirements

Inactive Publication Date: 2019-02-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal activation and photoactivation reaction conditions require heating or ultraviolet light irradiation, and the reaction conditions are more complicated; after the transition metal activates the persulfate, a large amount of transition metal will remain in the water body, which is likely to cause secondary pollution; electrical activation requires additional electrical energy output, the energy consumption is relatively high
There are many deficiencies in the existing technology in practical application, and it is impossible to realize large-scale practical application to treat azo dye wastewater

Method used

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  • Method for degrading azo dye wastewater by activating persulfate through bioelectricity
  • Method for degrading azo dye wastewater by activating persulfate through bioelectricity
  • Method for degrading azo dye wastewater by activating persulfate through bioelectricity

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preparation example Construction

[0021] The preparation of electrodes is as follows: two carbon felts are soaked in 1mol / L sulfuric acid for 12 hours, and then rinsed with distilled water. After rinsing, soak in 1mol / L NaoH for 12 hours, take it out, rinse it repeatedly with distilled water, put it in an oven to dry after rinsing, and make anode electrode 4 and cathode electrode 10 respectively by inserting carbon felt with titanium wire.

[0022] The construction of the microbial fuel cell is to use a plexiglass plate to make a sealed container, and an anode water inlet 3 is designed at the left end of the anode chamber to replace the anolyte; an anode sampling port 1 is designed at the upper end of the anode chamber for regular sampling , to test water quality. A cathode water inlet 9 and a cathode sampling port 8 are also designed at the cathode. The volume of the anode chamber 6 and the cathode chamber 11 are equal, and the proton exchange membrane 5 is used to insulate, supplemented by a silica gel gask...

Embodiment 1

[0027] Construct figure 1 The structure of the microbial fuel cell shown. The microbial fuel cell is irradiated with ultraviolet light for 30 minutes on the aseptic purification operation table, and the ozone generated after ultraviolet irradiation is blown out by blowing for about 15 minutes, and then the microbial fuel cell is started. The anolyte in the start-up phase is: 1mL of rubrum spirulina bacterial solution, 129mL of substrate (polyether wastewater) for the reproduction of rubrum spirulina to produce electricity, and the pH of the solution is adjusted to 7.0 with phosphate buffer, and it acts as an electrolyte. Catholyte: 2mmol / L potassium persulfate solution, adjust pH to 3.0 with phosphate buffer. After long-term operation, microorganisms will be enriched on the carbon felt electrode to achieve microbial film formation. The voltage at both ends of the external load 7 is continuously and automatically collected and stored by a 16-channel signal collector connected...

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Abstract

The invention discloses a method for degrading azo dye wastewater by activating persulfate through bioelectricity, belonging to the technical field of sewage treatment. Electrons are generated after asubstrate is degraded by microorganisms in an anode chamber of a microbial fuel cell, are transferred to an anode electrode and are transferred to a cathode electrode through an external circuit. Persulfate is taken as an electron acceptor and is capable of continuously receiving electrons on the cathode electrode. The electrons are continuously generated, transferred and received so as to generate bioelectricity. After the electrons are continuously received by persulfate at the cathode, a sulfate free radical (SO<->4.) with a strong oxidizing property is generated, has extremely high oxidation-reduction potential and is capable of effectively oxidizing and degrading the azo dye wastewater in a cathode chamber. Extra electric power output is omitted, a reaction system is simple and convenient, the energy consumption is low, and the secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for bioelectrically activating persulfate to degrade azo dye wastewater. Background technique [0002] Azo dyes are currently the most widely used dyes. In the actual production and application process, about 10%-15% of the dyes are discharged into the environment without treatment. It not only reduces the dissolved oxygen in the water body, destroys the self-purification ability of the water body, causes serious damage to the ecological environment of the water body, and seriously threatens the health of those who come into contact with it. Therefore, azo wastewater must be harmlessly treated before discharge. Persulfate advanced oxidation technology can effectively overcome the disadvantages of weak oxidation ability and long treatment cycle of traditional treatment methods, can efficiently oxidize and degrade dye wastewater, and improve the harm caused by dy...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/34C02F101/38
CPCC02F3/005C02F3/34C02F2101/308C02F2101/38
Inventor 姚海祥冯俊生蔡晨
Owner CHANGZHOU UNIV