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http://dx.doi.org/10.4491/eer.2018.349

Electrooxidation of tannery wastewater with continuous flow system: Role of electrode materials  

Tien, Tran Tan (Department of Mechatronics and Sensor Systems Technology, Vietnamese German University)
Luu, Tran Le (Department of Mechatronics and Sensor Systems Technology, Vietnamese German University)
Publication Information
Environmental Engineering Research / v.25, no.3, 2020 , pp. 324-334 More about this Journal
Abstract
Tannery wastewater is known to contain high concentrations of organic compounds, pathogens, and other toxic inorganic elements such as heavy metals, nitrogen, sulfur, etc. Biological methods such as aerobic and anaerobic processes are unsuitable for tannery wastewater treatment due to its high salinity, and electrochemical oxidation offers a promising method to solve this problem. In this study, raw tannery wastewater treatment using DSA® Ti/RuO2, Ti/IrO2 and Ti/BDD electrodes with continuous flow systems was examined. Effects of current densities and electrolysis times were investigated, to evaluate the process performance and energy consumption. The results showed that a Ti/BDD electrode is able to reach higher treatment efficiency than Ti/IrO2, and Ti/RuO2 electrodes across all parameters, excluding Total Nitrogen. The main mechanism of tannery wastewater oxidation at a Ti/BDD electrode is based on direct oxidation on the electrode surface combined with the generation of oxidants such as °OH and Cl2, while at DSA® Ti/RuO2 and Ti/IrO2 electrodes, the oxidation mechanisms are based on the generation of chlorine. After treatment, the effluents can be discharged to the environment after 6-12 h of electrolysis. Electrooxidation thus offers a promising method for removing the nutrients and non-biodegradable organic compounds in tannery wastewater.
Keywords
Electrooxidation; Tannery wastewater; Ti/BDD; $Ti/IrO_2$; $Ti/RuO_2$;
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