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In this paper, the decolorization of simulated rhodamine B dye wastewater was investigated using a three dimensional electrode reactor with granular activated carbon(GAC) loaded with manganese oxide (MnOx/GAC) as the particle electrode. The decolorization ratio by two-dimensional electrode, traditional three-dimensional electrode and MnOx/GAC three-dimensional electrode method was compared respectively,...
Removal of cyanides by the pulsed discharge plasma using a needle-plate reactor has been investigated. Effects of some factors were studied, including treatment modes, pH values, treatment time, and bubbling gases. The results of experiment indicate that the removal efficiency of cyanide increased greatly when air or nitrogen was injected into the reaction region during the discharge process, and...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
Water purification by streamer discharge using pulsed-power generator under a high-conductivity water containing pollutants has been investigated. A gas-liquid separated reactor was developed to treat highly conductive solution. A wire electrode was placed in the gas phase and a plane electrode was immersed in the water. A pulsed high voltage generated by six stacked Blumlein lines was applied to...
The exploring work of using the synthetic diamond film electrode to degrade pollutants through electrochemical oxidation technology has become one of the most concerned research hot spots in the environmental electrochemistry fields. BDD film electrode is an innovative material having the widest electrochemical window and an excellent stability in an acid or alkali solution. BDD film electrode has...
Membrane-making wastewater contains DMF, with high COD, toxicity and non-biodegradability. In this work, aerobic Fe-C micro-electrolysis and three-dimensional electrodes technology were applied for the pretreatment aiming to improve the biodegradability of the wastewater. It was found that the optional pretreatment conditions were pH 3 for Fe-C micro-electrolysis and pH 5 for the three-dimensional...
This work was conducted to study the changing characteristics of the oxidation-reduction potentials (ORP) during the processes of the biological decolorization of azo dyes, knowledge of which would be useful for prediction of the decolorization capacity of oxidative and reductive biocatalysts. Reduction of these azo dyes did not occur under aeration conditions, and azo dyes were reduced by microorganisms...
Electrochemical process was developed for wastewater treatment of phenolic compounds. The most reactive hydroxyl radical was generated by electrochemical approach and could effectively degrade organic pollutants. The toxicity of wastewater was largely reduced. The degradation pathway was proposed.
An electrochemical heterogeneous catalytic process was applied to remove nitrobenzene from wastewater. Three key factors, including applied potential, supporting electrolyte concentration, and pH, were tested for their effects on the nitrobenzene removal. The optimal condition was determined as an applied potential of 40 V, Na2SO4 concentration of 500 mg L-1 and a pH of 10. Under the optimal condition,...
Recently, the advanced oxidation process (AOP) has been regarded as one of treatment processes for non-biodegradable hazardous wastewater because of reinforced environmental regulations. In this study, non-biodegradable wastewater was dissociated by advanced oxidation process using AC-pulsed discharge in water. This apparatus consisted of 1N/m3 reactor, plate-plate type electrodes, and 5.6kW AC pulsed...
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