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In this study, decolorization and chemical oxygen demand (COD) reduction of coking wastewater by electrocoagulation process has been investigated. Effects of operating parameters, such as current density, pH of solution, electrolyte concentration and hydraulic residence time (HRT) on decolorization by continuous electrocoagulation were further studied in order to optimize process performance. The...
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,...
Electrocatalytic oxidation (ECO) of phenol was carried out using a self-made anode, Ti/SnO2-Sb2O3-IrO2. Preliminary investigations showed that only a small fraction of phenol was oxidized by direct electrolysis, while complete degradation of phenol was achieved by indirect electrocatalytic oxidation using chloride as a supporting electrolyte. Chlorophenols and formic acid were the intermediate products...
This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing NaOH in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 1% NaOH with 3A current and the reaction temperature remains 20°C and the reaction time lasts 10~30 s, the stench dodecyl...
In order to evaluate the electrolytic decomposition process of ammonia, the effects of current density and chloride ion were investigated. The Ti/RuO2- Pt electrode was used as the anode, and Ti electrode as the cathode. The current densities, of 5mA/cm2, 10mA/cm2, and 15mA/cm2, were applied during electrolysis. It was indicated that the ammonia-nitrogen removal efficiency increased with the current...
Lead dioxide catalyzed cathode (PbO2) which has high overpotential and electrode potential with low cost was tested in microbial fuel cells (MFCs) for sulfide removal in this study, compared with traditional platinum based carbon cathode (Pt/C). The maximum power density of 997.26±20.20 mW/m2 was realized, with sulfide removal efficiency as high as 88.73±4.37%, both showing advantage to Pt/C cathode...
This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing Na2SO4 in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 1%(m/V)Na2SO4 with 1A current and the reaction temperature remains 30 and the reaction time lasts 10 ~ 30 s, the stench...
The electrochemical oxidation decolorization of the azo dye wastewater containing Acid Red G (5-acetylamino-4- hydroxy-3-phenylazo-naphthalene-2,7-disulfonic sodium) was investigated. The effect of the operating parameters, such as applied voltage, dye concentration, electrolyte concentration and temperature, on the dye wastewater decolorization efficiency was analyzed. The reaction dynamics equation...
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 paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing NaCl in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 30 g/L NaCl with certain current and the reaction temperature remains 20degC and the reaction time lasts 10~30 s, the stench...
This paper investigated the effect of ammonia-nitrogen to the removal of phenol by electrochemical oxidation in the Chloride System. The electrode of RuO2-Pt/Ti was used as the anode and a Ti plate as the cathode. The results of cyclic voltammetry experiments showed that the RuO2-Pt/Ti anode had no effect of the direct oxidation for both phenol and ammonia- nitrogen, which suggested that the intermediate...
The electrochemical oxidation of imazethapyr at Ti/SnO2-Sb2O5/PbO2 electrode was investigated by cyclic voltammetry, and the oxidation mechanism of imazethapyr was primarily studied in this paper . Sodium sulfate was used as the electrolyte of the substrate solutions. The experimental results of cyclic voltammetry show that acidic media is suitable for efficient electrochemical oxidation of imazethapyr...
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