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Method for treating organic wastewater by photoelectric combined technique

A technology for organic wastewater and technical treatment, which is applied in illumination water/sewage treatment, electrochemical water/sewage treatment, multi-stage water treatment, etc. It can solve the problems of incomplete degradation, large investment in reactor construction, and incomplete reaction. Achieve the effect of easy industrial scale-up application, good COD removal rate, and complete wastewater degradation

Active Publication Date: 2015-05-20
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, there are also low treatment concentration, large investment in reactor construction, ultraviolet photocatalysis, because water easily absorbs ultraviolet light, which reduces the catalytic efficiency and makes the reaction incomplete, and the catalyst zero-valent iron and zinc is easy to form oxides and deactivate. Disadva

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  • Method for treating organic wastewater by photoelectric combined technique

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preparation example Construction

[0015] The preparation method of the three-dimensional electrode material used in the electric reaction stage is as follows: the main anode is a boron-doped diamond film electrode, the main cathode is stainless steel (can be made into a drum), and the electrode material filled with particles is carbon nanofibers and calcium alginate microspheres. 5-20g / L, cell voltage 8-12V, initial pH value 6.0-7.5, treatment time 20-60min. Among them, the preparation method of the main anode-boron-doped diamond film electrode is as follows: choose diamond powder, mechanically grind on the surface of the substrate material to form scratch damage, and then use acetone solution to ultrasonically clean it for standby; use acetone as the carbon source, hydrogen as the etching gas, Boron trioxide (B 2 o 3 ) as the dopant source, the main anode boron-doped diamond film electrode material is prepared by hot wire chemical vapor deposition (HFCVD); the base material mainly includes one or more of p-t...

Embodiment 1

[0020] Embodiment 1: Unsymmetrical dimethylhydrazine wastewater treatment

[0021] At room temperature 35°C, add 1.0 g of 4% CuO-4% ZrO 2 -ZnO (molar ratio) modified nano-zinc oxide catalyst, add 10mL 30% hydrogen peroxide to enhance the generation of OH, put the mixed solution in a dark place, stir and mix well, put it under a UV lamp for photocatalytic degradation for 30min, take out A certain amount of treatment liquid is subjected to concentration measurement. After photocatalytic degradation, the concentration of unsymmetrical dimethylhydrazine was 68.5mg / L, the removal rate was 86.3%, the COD was 204.7mg / L, the removal rate was 79.4%, and the intermediate product NH 3 -N content is 35 mg / L, and nitrosodimethylamine NDMA content is 14.3 mg / L. Then the light-treated wastewater is transferred to an electrochemical device, the main anode is a boron-doped diamond film electrode, the main cathode is a drum made of stainless steel, and the filling material is 10g / L carbon nan...

Embodiment 2

[0022] Embodiment 2: aniline wastewater treatment

[0023] Add 0.4g of 2%CuO-0.5%ZrO to 100mL of aniline wastewater with an initial concentration of 450mg / L and an initial COD of 991mg / L at a room temperature of 18°C 2 -ZnO (molar ratio) modified nano-zinc oxide catalyst and 10mL of 30% hydrogen peroxide, the mixed solution was placed in a dark place and stirred evenly, then photocatalytic degradation was carried out under an ultraviolet lamp for 60min, and a certain amount of the treatment solution was taken out for concentration determination. After photocatalytic degradation, the concentration of aniline was 136.2mg / L, the removal rate was 69.7%, and the COD was 343.9mg / L, the removal rate was 65.3%. Then the light-treated wastewater is transferred to the electrochemical device, the main anode is a boron-doped diamond film electrode, the main cathode is stainless steel, the filling material is 5g / L carbon nanofiber and 20g / L calcium alginate microspheres, and the cell volta...

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Abstract

The invention discloses a method for treating organic wastewater by a photoelectric combined technique. A photocatalyst and three-dimensional electrodes are synergically utilized to treat organic wastewater, wherein the main anode is a boron-doped diamond film electrode, the main cathode is stainless steel, and the filled particle electrode material is composed of carbon nano fibers and calcium alginate microspheres. The catalyst generates holes with strong oxidizing property under the light irradiation; the high-catalytic-activity three-dimensional electrode materials are combined to generate higher oxygen overpotential and generate active oxygen substances (such as hydroxy free radical -OH, H2O2, -OOH, -O and the like); C-N, N-N, N=O and other bonds in toxic and nondegradable wastewater containing unsymmetrical dimethylhydrazine, nitrosodimethylamine and the like are ruptured and efficiently degraded into carbon dioxide, water, ammonium salt NH4<+> and the like; and COD (chemical oxygen demand) in the wastewater is greatly removed under neutral room-temperature conditions. The method has the advantages of high efficiency of combined oxidation treatment and no secondary pollution, and is an efficient method for treating nondegradable wastewater.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating organic waste water using photoelectric combination technology, and belongs to the technical field of catalytic advanced oxidation for waste water treatment. Background technique [0002] In recent years, with the rapid development of my country's economy, the total amount of wastewater discharge has continued to increase. About 10 billion cubic meters of wastewater are discharged directly into water bodies without treatment each year; among the treated wastewater, there are still about 40% of them. The situation of water pollution is still grim. Research surveys have shown that a large part of environmental pollution is difficult to treat organic wastewater. This kind of wastewater mainly comes from energy industry (coal, gas, etc.), chemical industry (pesticides, medicines, dyes, organic synthesis intermediates, etc.), military industry (chemical weapon...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/32C02F1/72C02F1/46B01J23/06C02F101/30C02F101/34C02F101/38
CPCC02F1/32C02F1/46C02F1/72C02F9/00C02F2101/30C02F2101/38C02F2101/40C02F2209/08C02F2301/08
Inventor 吴敏梁美玲李伟杰曾平川周宇骋倪恨美
Owner SOUTHEAST UNIV
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