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Continuous circular flow-type photoelectric catalytic fixed bed reactor with 3D electrodes and its organic sewage treating method

A photoelectric catalysis, fixed bed technology, applied in chemical instruments and methods, electrochemical water/sewage treatment, illumination water/sewage treatment, etc. It can reduce the mass transfer effect, save the cost and improve the efficiency.

Inactive Publication Date: 2006-01-25
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1377728 discloses an invention named "three-phase three-dimensional electrode reactor", which combines a three-dimensional electrode reactor and a photocatalytic reactor to form a photoelectric reactor for treating organic wastewater, but because the reactor only uses three-dimensional The electrode (activated carbon is filled with particles) is combined with the upper part of the TiO2 suspended state photocatalytic reactor, and the synergy between light and electricity is poor, thus affecting the treatment effect of organic wastewater
Moreover, due to the limited contact area and contact time between the wastewater and the electrocatalyst in the reactor, the treatment efficiency of the wastewater is not high.

Method used

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  • Continuous circular flow-type photoelectric catalytic fixed bed reactor with 3D electrodes and its organic sewage treating method
  • Continuous circular flow-type photoelectric catalytic fixed bed reactor with 3D electrodes and its organic sewage treating method
  • Continuous circular flow-type photoelectric catalytic fixed bed reactor with 3D electrodes and its organic sewage treating method

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Experimental program
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Effect test

Embodiment 1

[0023] Process the active dye waste liquid of 0.5mmol / L pH value 5.6 with the continuous circulating flow type fixed bed three-dimensional electrode photocatalytic reactor of the present invention, at 30.0V voltage, 0.05MPa air velocity, electrolyte Cl - When the concentration is 0.5mol / L, the removal rate of reactive dyes is 96% when the photocatalytic reaction is 60min, which is higher than 70% and 77% only in photocatalytic and electrochemical oxidation; while TOC The change of and its degradation rate have a similar trend! That is, the TOC removal rate of the reactive dye solution was 61% when the photocatalytic reaction was performed for 150 minutes, which was higher than the 49% and 17% TOC removal rates only in photocatalytic and electrochemical oxidation;

Embodiment 2

[0025] When processing the quinoline solution of 0.25mmol / L pH value 6.8 with the continuous circulating flow type fixed-bed three-dimensional electrode photocatalytic reactor of the present invention, at 30.0V voltage, 0.075MPa air velocity, electrolyte Cl - When the concentration is 0.5mol / L, the removal rate of quinoline is 73% when the photocatalytic reaction is 60min, which is higher than 52% and 26% only in the photocatalytic and electrochemical oxidation; when the photocatalytic reaction is 120min, quinoline The removal rate increased to more than 93%, but it was also higher than 71% and 38% only in photocatalytic and electrochemical oxidation; the change of TOC in the degradation process of quinoline had a similar trend to its degradation rate! That is, the TOC removal rate of the quinoline solution was 41% when the photocatalytic reaction was 60 min, which was higher than the 38% and 7% of the TOC removal rate only in the photocatalytic and electrochemical oxidation; ...

Embodiment 3

[0027] Process the reactive dye waste liquid of 0.5mmol / L pH value 5.6 with the continuous circulating flow type fixed-bed three-dimensional electrode photocatalytic reactor of the present invention, at 0.05MPa air velocity, electrolyte Cl -When the concentration is 0.5mol / L, when the voltage is 10V, the removal rate of active dye is 84% ​​when the photocatalytic reaction is 60min, and when the voltage is increased to 30V, the removal rate of active dye is 96% when the photocatalytic reaction is 60min. The degradation rate of reactive dyes is also from 0.0300min at 10V voltage -1 0.0539min increased to 30V -1 . During the degradation process of quinoline, the degradation rate and degradation rate of quinoline have a similar trend to that of reactive dyes! Promptly when processing the quinoline solution of 0.25mmol / L pH value 6.8 with the continuous circulating flow type fixed-bed three-dimensional electrode photocatalytic reactor of the present invention, at 0.05MPa air velo...

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Abstract

The continuous circular flow-type optoelectric catalytic fixed bed reactor has structure including casing, microporous titanium plate cathode, porous titanium ring anode, double-layer U-shaped quartz tube, UV lamp inside the U-tube as light source, optoelectric catalytic reaction chamber formed between the cathode and the anode, fixed bed 3D particle electrode set inside the reaction chamber and formed via painting nano TiO2 onto SiO2 particle, and continuous circulating unit comprising liquid storage and pump connected between the liquid inlet and liquid outlet of the reaction chamber. The present invention also provides the method and technological conditions of treating organic sewage with the reactor. Inside the reactor, voltage higher than the oxidation potential of the pollutant is applied to raise the photocatalytic and eletrocatalytic oxidation efficiency.

Description

technical field [0001] The invention relates to a continuous circulating flow type fixed-bed three-dimensional electrode photoelectric catalytic reactor for treating organic wastewater and a method for treating organic wastewater. technical background [0002] Although there are many patents on heterogeneous photocatalysis technology, the application of heterogeneous photocatalysis in actual wastewater treatment is not very common due to the rapid recombination of photogenerated electrons and holes. Therefore, in order to truly realize the practical industrial application of heterogeneous photocatalytic treatment of organic wastewater, inhibiting the recombination of photogenerated electrons and holes is one of the key issues that must be solved to improve the photocatalytic efficiency. To this end, in recent years, many methods have been proposed to improve photocatalytic efficiency, such as the deposition of noble metals on the semiconductor surface, metal ion doping, or a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/46C02F1/461C02F1/32
Inventor 安太成张文兵肖贤明傅家谟盛国英
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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