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Alternating current-powered bioelectrode for enhanced sulfide removal from sulfide-rich organic effluent
Ye Yuan1, Xing Zong1, Jiayi Huang1
1School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, 224051, PR China.
None:
Conventional biological wastewater treatments often struggle with efficient sulfide removal. This study presents an innovative and sustainable approach using an alternating current (AC)-powered bioelectrode to facilitate periodic microbial oxidation and reduction for sulfide removal from sulfide-rich organic effluents. The AC bioelectrode addressed the drawbacks of conventional direct current (DC) systems, demonstrating 93.2 % sulfide removal, 64.5 % elemental sulfur production and 75.8 % chemical oxygen demand removal, coupled with a 25 % decrease in energy consumption. AC stimulation mitigated elemental sulfur accumulation on the electrode surface, promoted biofilm colonization, and enhanced bidirectional electrocatalytic activity, thereby elevating active biomass and electron utilization efficiency. Additionally, AC bioelectrode enriched functional microbiomes capable of sulfur-oxidizing, sulfur-reducing, and electron-transport capacities, as confirmed by enzyme gene expression profiling. This study offers an efficient, resource-efficient, and sustainable solution to treating sulfide-rich organic effluents.
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