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In situ coagulation-electrochemical oxidation of leachate concentrate:A key role of cathodes

Environmental Science and Ecotechnology 2023年第4期16卷 168-176页

作者： Huankai Li Qian Zeng Feixiang Zan Sen Lin Tianwei Hao Department of Civil and Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayHong KongChina School of Environmental Science and Engineering Low-Carbon Water Environment Technology Center(HUST-SUKE)Huazhong University of Science and TechnologyWuhanChina

To efficiently remove organic and inorganic pollutants from leachate concentrate,an in situ coagulation-electrochemical oxidation(CO-EO)system was proposed using Ti/Ti_(4)O_(7)anode and Al cathode,coupling the“super-Faradaic”dissolution of *** system was evaluated in terms of the removal efficiencies of organics,nutrients,and metals,and the underlying cathodic mechanisms were investigated compared with the Ti/RuO_(2)-IrO_(2)and graphite cathode *** a 3-h treatment,the Al-cathode system removed 89.0%of COD and 36.3%of total nitrogen(TN).The TN removal was primarily ascribed to the oxidation of both ammonia and organic-N to N_(2).In comparison,the Al-cathode system achieved 3-10-fold total phosphorus(TP)(62.6%)and metal removals(>80%)than Ti/RuO_(2)-IrO_(2)and graphite *** increased removals of TP and metals were ascribed to the in situ coagulation of Al(OH)_(3),hydroxide precipitation,and *** the reduced scaling on the Al cathode surface,the formation of Al^(3+)and electrified Al(OH)_(3)lessened the requirement for cathode cleaning and increased the bulk conductivity,resulting in increased instantaneous current production(38.9%)and operating cost efficiencies(48.3 kWh kg_(COD)^(−1)).The present study indicated that the in situ CO-EO process could be potentially used for treating persistent wastewater containing high levels of organic and inorganic ions.

关键词： Leachate concentrate Electrochemical process in situ coagulation treatment Cathode material Removal mechanism

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