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Three phase three-diemsnional electrode photoelectric reactor

A technology of three-dimensional electrodes and reactors, which is applied in the field of three-phase three-dimensional electrode photoelectric reactors, can solve the problems of rare research and achieve the effect of increasing dissolution rate, reasonable structure and tight structure

Inactive Publication Date: 2004-08-18
SUN YAT SEN UNIV
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Problems solved by technology

It has also been used in many applications in wastewater treatment, but most of them focus on the treatment of metal ion wastewater and the research in the field of organic wastewater is rare.
[0005] In particular, the combination of a three-dimensional electrode reactor and a photocatalytic reactor to form a photoelectric reactor, and its use in the efficient treatment of organic wastewater, has not yet been reported.

Method used

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example 1

[0029] Formic acid wastewater was treated with a photoelectric reactor with a bed height of 4 cm and an activated carbon packed bed as a three-dimensional electrode. We found that its COD removal efficiency is related to the applied voltage, and it increases with the applied voltage. At 10.0 volts, 0.1m 3 h -1 air flow, 500 watts high pressure mercury lamp and 0.08mgl -1 Degussa P25 TiO 2 In the presence of a photocatalyst, after 1 hour of reaction, 20.0 mmol-1 The COD concentration of the formic acid solution is from 320.5mgl -1 down to 118.4mgl -1 , and its removal rate is 62.9%. This removal rate is 35.5% higher than that of pure photocatalysis (under the same conditions except no voltage).

example 2

[0031] Dyeing and dyeing wastewater is one of the known difficult organic wastewater. It has color pollution besides COD pollution. A photoelectric reactor with a graphite packed bed with a bed height of 3 cm as a three-dimensional electrode can effectively remove COD and color from dye wastewater. At 30.0 volts, 0.6m 3 h -1 air flow, 500W high pressure mercury light and 0.1mgl -1 In the presence of Degussa P25 photocatalyst, 1.0mmoll -1 The photoelectric degradation of methylene blue conforms to the pseudo-first-order reaction kinetics as its photocatalytic degradation, but the rate constant of the former is 0.088min -1 , which is 1.6 times of the latter. After 0.5 hours of reaction, the solution was completely decolorized, and its COD removal efficiency was 87.2%, and its TOC removal efficiency was 81.1%. The removal efficiencies of COD and TOC are so similar, indicating that methylene blue is almost mineralized.

example 3

[0033] The photoelectric reactor has obvious photoelectric synergistic effect in the process of oxidative decomposition of organic matter. to 20.0mmoll -1 Formic acid solution, 0.1mgl -1 DegussaP25 photocatalyst, 0.2m 3 h -1 The air flow rate and bed height of 4cm activated carbon packed bed is a photoelectric reactor with three-dimensional electrodes. When there is no voltage, the photogenerated current when it is illuminated for 10 seconds is 12.3μA, and the current when it is 0.5 volts and no light is 127.6μA, and the photoelectric current is 188.5μA when it is illuminated for 10 seconds at 0.5V, which exceeds the sum of the current of a single electrochemical and a single photochemical process by 48.6μA. to 20.0mmoll -1 For a three-dimensional electrode photoreactor with a formic acid solution and a graphite packed bed with a bed height of 4 cm, the photogenerated current is 15.6 μA when there is no voltage and 10 seconds of light, and 133.2 μA when the voltage is 0.5...

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Abstract

The photoelectric reactor used in treating organic waste water consists of casing, 3D particle electrode, porous cathode titanium plate, anode titanium net, light source UV lamp and photocatalyst. It is one combination of triphase 3D electrode and photocatalytic technology, and it can capture photoelectrons in anode with bias voltage to raise the photocatalytic oxidation efficiency of titania and utilize the indirect electrochemical oxidatino and photocatalytic oxidation of H2O2 as strong oxidant produced in the 3D cathode. In addition, the porous titanium plate as both electrical feeder and aeration unit results in compact and reasonable structure, increased dissolution speed of oxygen of air in water and thus organic pollutant eliminating efficiency.

Description

technical field [0001] The invention relates to a three-phase three-dimensional electrode photoelectric reactor and its use for treating organic waste water. technical background [0002] In the late 1980s, the application of Advanced Oxidation Process (Advanced Oxidation Process) in environmental pollution control attracted widespread attention. where TiO 2 The semiconductor heterogeneous photocatalytic process has attracted much attention due to its unique advantages such as room temperature and deep reaction. It has the functions of oxidizing and mineralizing organic pollutants, reducing heavy metal ions, deodorizing, antiseptic and sterilizing. It has shown great application potential in the purification of air and water (M. Hoffman, S. Martin, W. Choi and D. Bahnemann, Chem. Rev., 1995, 95: 69). [0003] However, the electron-hole pairs generated by photoexcitation are very easy to recombine, resulting in a very low quantum efficiency of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/12C02F1/32
Inventor 熊亚安太成何春查长虹朱锡海
Owner SUN YAT SEN UNIV
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