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Updated: May 24, 2026

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
Recovery of silver from silver(I)-containing solutions in bioelectrochemical reactors
Hu-Chun Tao1, Zhu-You Gao, Hui Ding
1Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. taohc@pkusz.edu.cn
Abstract:
A novel approach was tested for metallic silver recovery and power generation by using cathodic reduction in bioelectrochemical systems (BESs). In dual-chamber BESs (130 mL volume) with acetate as electron donor on anode, both Ag(+) ions and Ag(I) thiosulfate complex in catholyte were reduced on cathode. The reduction rate of Ag(+) was more rapid than the Ag(I) complex as expected by energetic analysis. X-ray diffraction (XRD) analysis indicated that electrodeposits on cathodes from both catholyte were metallic silver with >91% purity. The feasibility of metallic silver recovery with the BESs was confirmed using simulated photographic wastewater and up to 95% of Ag(I) removal was achieved.
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