The aim was to examine the anodic oxidn. of some benzene derivs. (model org. pollutants) at Pt and DSA (dimensionally stable anodes) type anodes to elucidate the possibilities of the electrochem. method and to elucidate the mechanism of the reaction.

http://ma.ecsdl.org/content/MA2006-02/39/1775.full.pdf

Electrochemical Oxidation of Organic Pollutants for Wastewater Treatment

Electrochemical oxidation by means of boron-doped diamond (BDD) anodes generates a very efficient oxidizing environment by forming hydroxyl radicals, providing effective water purification for elimination of persistent pollutants. In this project the degradation rates of organic and inorganic substances are investigated. Experiments were performed in laboratory and pilot scale with synthetic and industrial wastewaters. Performance parameters were evaluated in terms of total organic carbon/chemical oxygen demand (COD) removal, specific energy consumption and current efficiency. The integration of this advanced oxidation technology combined with conventional technology was then applied in a wastewater treatment concept of landfill leachate. The raw leachate with a low biochemical oxygen demand/COD ratio was electrochemically oxidized to prepare the purified leachate for discharge into a sewage system or a receiving water body. The cost estimation regarding operation and capital costs addresses the economics for the treatment of heavily polluted effluents.

Electrochemical Oxidation of Wastewaters – Opportunities and Drawbacks

Relationship between substrate type and BDD electrode structure, performance and antibiotic tetracycline mineralization

In the present study, activated bentonite-based bismuth ferrites (A-BiFe/Bent) as particle electrodes were employed to degrade ethyl xanthate (EX) in a 3-dimensional Electro-Fenton system under visible light (Vis-3D/EF). The various operation conditions, including electrolyte types, electrolyte concentration, particle electrode dosage, applied voltage, aeration rate and initial pH, were investigated in detail. The degradation product of EX in the Vis-3D/EF system catalyzed by A-BiFe/Bent particle electrodes was comprehensively explored by UV-Visible spectrophotometer (UV–visible), proton nuclear magnetic resonance (1H NMR), liquid chromatograph-mass spectrometer (LC-MS) and fourier transform infrared (FTIR) techniques. It was found that EX was directly degraded into CO2, H2O and SO42- during the photoelectrocatalytic degradation. Based on the analysis results of X-ray photoelectron spectroscopy (XPS), quenching experiment and Electron Spin Resonance (ESR), the possible mechanism for the photoelectrocatalytic degradation of EX in the Vis-3D/EF system catalyzed by A-BiFe/Bent particle electrodes was proposed. The reasons for the highly oxidative capacity of Vis-3D/EF reaction system catalyzed by A-BiFe/Bent were mainly attributed to the high-efficient generation of H2O2, multiple generation sources for active species, and participation by all active species (·OH, h+ and ·O2-). The result of comparative experiment and kinetics indicate that a significant coupling effect between photocatalytic action and 2-dimensional electrode existed in the Vis-3D/EF system. A-BiFe/Bent presented good recycling efficiency and high stability during the photoelectrocatalytic degradation of EX. The Vis-3D/EF system catalyzed by A-BiFe/Bent particle electrodes holds great potential to treat EX in mineral flotation wastewater.

Three-dimensional photoelectrocatalytic degradation of ethyl xanthate catalyzed by activated bentonite-based bismuth ferrites particle electrodes: Influencing factors, kinetics, and mechanism

Advanced electrochemical treatment of real biotreated petrochemical wastewater by boron doped diamond anode: performance, kinetics, and degradation mechanism.

Electro-Fenton (EF) oxidation has high oxidation abilities and is widely used in the treatment of biorefractory and chemically refractory organic wastewater. However, it generates a large amount of...

Comparative electrochemical oxidation of the secondary effluent of petrochemical wastewater with electro-Fenton and anodic oxidation with supporting electrolytes.

Xiaolan Shen

Papers

Advanced electrochemical treatment of real biotreated petrochemical wastewater by boron doped diamond anode: performance, kinetics, and degradation mechanism.

Comparative electrochemical oxidation of the secondary effluent of petrochemical wastewater with electro-Fenton and anodic oxidation with supporting electrolytes.