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Photoelectrocatalytic degradation of high cod dipterex pesticide by using TiO_2 /Ni photo electrode

Journal of Environmental Sciences 2012年第6期24卷 1149-1156页

作者： Tao Fang Chao Yang Lixia Liao The State Key Lab of Urban Water Resource and Environment National Engineering Research Center of Urban Water Resource&The Academy of Fundamental and Interdisciplinary ScienceHarbin Institute of TechnologyHarbin 150080China College of Science Northeast Forestry UniversityHarbin 150040China

A TiO2 thin film electrode deposited on porous nickel net （TiO2/Ni） was prepared by the sol-gel method, and the surface morphology, crystal structure features and the grain size were characterized by Field emission scan electron microscopy （FESEM） and X-ray diffraction （XRD）. The photoelectrocatalytic system was set up using a UV high-pressure mercury lamp as the light source, TiO2 coated on foamed nickel as photo anode, Pt sheet as counter electrode and the pesticide dipterex in synthetic wastewater. Various factors that influence the photoelectrocatalytic decomposition of dipterex pesticide have been studied, such as degradation time, the type of electrolyte, current density, original pH value and different degradation methods. The prepared catalysts were employed to photoelectrocatalytically degrade the pesticide dipterex under UV irradiation, comparing the results with photocatalytic degradation and electrochemical oxidation. The results indicated that under the optimal conditions of 0.02 mol/L NaC1 as the supporting electrolyte, current density = 2.5 mA/cm^2, pH 6.0 and dipterex pesticide 40 mg/L, and reaction time 2 hr, dipterex chemical oxygen demand （cod） removal rate and organophosphorous conversion of up to 82.6% and 83.5% were achieved, respectively. The method of photoelectrocatalytic degradation is more efficient than photocatalysis and electrochemical oxidation. The possible roles of the electrolytes on the reactions and probable mechanisms were also discussed.

关键词： photoelectrocatalysis cod removal TiO2 dipterex pesticide

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Micro-electrolysis technology for industrial wastewater treatment

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Journal of Environmental Sciences 2003年第3期15卷 334-338页

作者： JIN Yi-zhong , ZHANG Yue-feng, LI Wei (Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.) Department of Environmental Engineering Zhejiang University Hangzhou Chin

Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and cod and improving the biodegradability of wastewater from pharmaceutical, dye-printing and papermaking plants. Results showed that the use of micro-electrolysis technology could remove more than 90% of chromaticity and more than 50% of cod and greatly improved the biodegradability of pharmaceutical wastewater. Lower initial pH could be advantageous to the removal of chromaticity. A retention time of 30 minutes was recommended for the process design of micro-electrolysis. For the use of micro-electrolysis in treatment of dye-printing wastewater, the removal rates of both chromaticity and cod were increased from neutral condition to acid condition for disperse blue wastewater; more than 90% of chromaticity and more than 50% of cod could be removed in neutral condition for vital red wastewater.

关键词： micro-electrolysis pharmaceutical wastewater dye-printing wastewater papermaking wastewater cod removal chromaticity removal

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Dyeing and printing wastewater treatment using fly-ash coated with chitosan

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Chinese Journal of Oceanology and Limnology 2009年第4期27卷 875-881页

作者：陈忻孙恢礼 South China Sea Institute of Oceanology Chinese Academy of Sciences Graduate School Chinese Academy of Sciences Department of Chemistry and Chemical Engineering Foshan University

Printing and dyeing industry is a considerable source of environmental contamination. In this study treatment of printing and dyeing wastewater with a new type of sewage treatment agent, fly-ash coated with chitosan particles （FCCP）, was examined. The effects ofpH, stirring time, sedimentation time and temperature on color, cod, turbidity and NH3-N removal were determined. The optimum dosage of FCCP and the influence of individual factors on removal efficiency were tested. The optimum parameters determined using the L16 （45） orthogonal experiment were as follows： FCCP （weight ratio of chitosan to fly-ash 1：6） dosage, 4 g.L^-1; temperature, 35℃; pH, 4. The stirring time and sedimentation time were 20 min and 5 h, respectively. Under these optimum conditions, the color, cod and NH3-N removal ratios were 97%, 80% and 75%, respectively.

关键词： FCCP printing and dyeing wastewater treatment color removal cod removal

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Submerged Sequencing-Batch Membrane Bioreactor and Mechanisms for the proessing of coke wastewater

Submerged Sequencing-Batch Membrane Bioreactor and Mechanism...

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The 12th Asian Pacific Confederation of Chemical Engineering Congress

作者： Wen-Ying Li Jing-Wen Wu Bao-Jie Zhao Jie-Ying Jing Key Laboratory of Coal Sdence and Technology for Ministry of Education and Shanxi Province,Taiyuan University of Technology,030024,China

This research describes cod and NH-N removal of coke wastewater using a laboratory scale Submerged Sequencing Batch Membrane *** reactor was fed with coke wastewater in descending dilution multiples until finally orig... 详细信息

关键词： coke wastewater treatment submerged sequencing batch membrane biorector cod removal ammonia nitrogen removal mechanisms

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