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To solve the problems of the papermaking wastewater new discharge standards and reuse The microelectrolysis-fenton process has been applied to the advanced treatment of middle-stage wastewater with of poplar PRC-APMP Pulping. The effects of operational conditions such as Fe/C, pH, iron quantity, H2O2 dosage and reaction time, have been experimental studied, subsequently the best handles technological...
Degradation of phenol by an electrochemical heterogeneous catalytic process was applied in packed bed electrolytic reactor with graphite electrode. The catalyst was characterized by SEM and the effects of pH, the applied potential and Na2SO4 on the efficiency of the electrochemical oxidation phenol process were also studied. It was found that the optimal condition was an applied potential of 25V,...
The electrochemical oxidation of atrazine on Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltammetry in this paper. The electrochemical behaviour of the electrode in sodium sulfate solution and in the mixture solution of sodium sulfate and atrazine has been studied. The experimental results of cyclic voltammetry showed that acidic media was suitable for efficient electrochemical oxidation of...
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 this paper, pretreating p-tertt-butylphenol formaldehyde resin synthesized wastewater has been carried out by the combined techniques of the ferric-carbon micro-electrolysis (abbreviated as FCME) and the Fenton reaction. The result shows that when the COD of the wastewater is between 3350~8370mg/L, pH=2.0 and the reaction time of FCME is 120 minute, the removal of COD is above 48% though the FCME...
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...
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...
In this paper a process of combining internal electrolysis and Fenton was used to pre-treat acrylic fiber wastewater based on investigating the optimization parameters of internal electrolysis and Fenton oxidization. Four kinds of combining processes were studied. Results showed that both the processes of Fenton oxidization next to internal electrolysis and internal electrolysis coupled Fenton oxidization...
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...
In this study, a combined treating process (neutralization, electrolysis, ozone oxidization, coagulation and cinder adsorption) was introduced to investigate the possibility of degradation of concentrated azo dye wastewater. The optimum operation parameters were obtained through small-scale bench tests and pilot-scale tests, and then were put into operation. The experimental results showed that the...
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...
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...
Three kinds of electrochemical methods, electro-flocculation, indirect electro-oxidation and electro-Fenton were examined as pre-treatment processes for fresh dyestuff wastewater with high salinity and non-biodegradable organic concentration. The efficiency of each technique was evaluated according to the reduction levels of COD and toxicity, as well as biodegradability improvement. The results indicate...
In this paper, the elimination of o-nitrophenol (o-NPh) in aqueous solutions by electrochemical oxidation at titanium-based bismuth-doped lead dioxide (Ti/Bi-PbO2 ) anode and carbon gas diffusion cathode (carbon GDC) was investigated. Four factors of the degradation, i.e. current density I, initial pH, electrolysis temperature T, air input A, were studied. Under the conditions of I = 20 mA/cm2, pH...
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