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Micro-electrolysis technology for industrial wastewater treatment
Yi-Zhong Jin1, Yue-Feng Zhang, Wei Li
1Department of Environmental Engineering, Zhejiang University, Hangzhou, China. jyzjyy@mail.hz.zj.cn
Journal of Environmental Sciences (China)
|August 27, 2003
Summary
Micro-electrolysis effectively removes over 90% of chromaticity and 50% of chemical oxygen demand (COD) from industrial wastewater. This technology significantly enhances wastewater biodegradability, particularly for pharmaceutical effluents.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Electrochemistry
Background:
- Industrial wastewater, including effluents from pharmaceutical, dye-printing, and papermaking plants, often contains high levels of chromaticity and chemical oxygen demand (COD).
- These pollutants negatively impact aquatic ecosystems and pose challenges for conventional wastewater treatment methods.
- Improving the biodegradability of such wastewater is crucial for effective and sustainable treatment.
Purpose of the Study:
- To investigate the efficacy of micro-electrolysis in removing chromaticity and COD from industrial wastewater.
- To assess the impact of micro-electrolysis on the biodegradability of pharmaceutical wastewater.
- To determine optimal operating conditions, such as initial pH and retention time, for micro-electrolysis treatment.
Main Methods:
- Micro-electrolysis experiments were conducted on wastewater samples from pharmaceutical, dye-printing, and papermaking industries.
- Variations in initial pH and retention time were explored to optimize pollutant removal.
- Wastewater biodegradability was assessed before and after micro-electrolysis treatment.
Main Results:
- Micro-electrolysis achieved over 90% removal of chromaticity and more than 50% removal of COD from the tested wastewaters.
- Pharmaceutical wastewater biodegradability was significantly improved by the micro-electrolysis process.
- Lower initial pH favored chromaticity removal, and a retention time of 30 minutes was found to be optimal.
- For dye-printing wastewater, acidic conditions enhanced removal rates for disperse blue wastewater, while neutral conditions were effective for vital red wastewater.
Conclusions:
- Micro-electrolysis is a highly effective technology for decolorization and COD reduction in industrial wastewater.
- The process substantially improves the biodegradability of pharmaceutical wastewater, facilitating further treatment.
- Optimizing pH and retention time is key to maximizing the efficiency of micro-electrolysis for different industrial effluents.