Micro-electrolysis technology for industrial wastewater treatment

Article type: Research Article

Authors: Jin, Yi-zhong | Zhang, Yue-feng | Li, Wei

Affiliations: Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China

Abstract: Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability of wastewater from pharmaceutical, dye-printing and papermaking plants. Results showed that the use of micro-electrolysis technology could remove more than 90% of chromaticity and more than 50% of COD and greatly improved the biodegradability of pharmaceutical wastewater. Lower initial pH could be advantageous to the removal of chromaticity. A retention time of 30 minutes was recommended for the process design of micro-electrolysis. For the use of micro-electrolysis in treatment of dye-printing wastewater, the removal rates of both chromaticity and COD were increased from neutral condition to acid condition for disperse blue wastewater; more than 90% of chromaticity and more than 50% of COD could be removed in neutral condition for vital red wastewater.

Keywords: micro-electrolysis, pharmaceutical wastewater, dye-printing wastewater, papermaking wastewater, COD removal, chromaticity removal

Journal: Journal of Environmental Sciences, vol. 15, no. 3, pp. 334-338, 2003