TY - JOUR
T1 - Electrochemical oxidation pretreatment of refractory organic pollutants
AU - Chiang, Li Choung
AU - Chang, Juu En
AU - Tseng, Shu Chuan
N1 - Funding Information:
The financial support from the National Science Council of the R.O.C. under Grant NSC 84-2211·EOO6-003 is acknowledged. The authors also thank Prof. Chen Chiu-Yang at the Department of Environmental Engineering. National Chung Hsing University, for his kind assistance in the Microtox test experiments.
PY - 1997
Y1 - 1997
N2 - Refractory pollutants, including lignin, tannic acid, chlortetracycline, and EDTA, were destroyed by an electrochemical oxidation method to evaluate the applicability of this method for industrial wastewater pretreatment. Operation parameters, such as supporting electrolyte, current density, and electrolyte concentration, have been investigated for their influences on COD removal efficiencies during electrolysis. In addition, gel permeation chromatography (GPC), Microtox test, and total organic halogen (TOX) analyses were performed to monitor the changes of organic characteristics of these refractory pollutants. Experimental results show that, among sulfate, nitrate, and chloride, chloride was the best supporting electrolyte, and during electrolysis, both COD and color removal efficiencies were improved by increasing current density and chloride concentration. From GPC analysis results, the electrochemical oxidation process readily destroys high-molecular-weight (HMW) organics. Microtox test results also show that the process can reduce the toxicity of these refractory organic compounds. In addition, TOX concentrations were found to increase at the beginning but then decline during the electrolysis. The above results suggest that the electrochemical oxidation process, which has good efficacy for detoxification and destruction of refractory pollutants, is a promising method for wastewater pretreatment.
AB - Refractory pollutants, including lignin, tannic acid, chlortetracycline, and EDTA, were destroyed by an electrochemical oxidation method to evaluate the applicability of this method for industrial wastewater pretreatment. Operation parameters, such as supporting electrolyte, current density, and electrolyte concentration, have been investigated for their influences on COD removal efficiencies during electrolysis. In addition, gel permeation chromatography (GPC), Microtox test, and total organic halogen (TOX) analyses were performed to monitor the changes of organic characteristics of these refractory pollutants. Experimental results show that, among sulfate, nitrate, and chloride, chloride was the best supporting electrolyte, and during electrolysis, both COD and color removal efficiencies were improved by increasing current density and chloride concentration. From GPC analysis results, the electrochemical oxidation process readily destroys high-molecular-weight (HMW) organics. Microtox test results also show that the process can reduce the toxicity of these refractory organic compounds. In addition, TOX concentrations were found to increase at the beginning but then decline during the electrolysis. The above results suggest that the electrochemical oxidation process, which has good efficacy for detoxification and destruction of refractory pollutants, is a promising method for wastewater pretreatment.
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U2 - 10.1016/S0273-1223(97)00378-8
DO - 10.1016/S0273-1223(97)00378-8
M3 - Conference article
AN - SCOPUS:0030712158
SN - 0273-1223
VL - 36
SP - 123
EP - 130
JO - Water Science and Technology
JF - Water Science and Technology
IS - 2-3
T2 - Proceedings of the 1996 2nd IAWQ International Conference on Pretreatment of Industrial Wastewaters
Y2 - 16 October 1996 through 18 October 1996
ER -