Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 278, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119331
Keywords
Bioelectroremediation; Sediment microbial fuel cell; Contaminated river; Tourmaline; Biofilm microbiome
Funding
- National Natural Science Foundation of China [31870114]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2019DX02]
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The efficient degradation of pollutants in river sediments is essential for the bioremediation of contaminated rivers. In the present study, sediment microbial fuel cells (SMFCs) with manganese dioxide/tourmaline composite modified cathodes (MnO2/T-SMFCs) were developed to simultaneously produce electricity and degrade organic matter in contaminated river sediment and water. The MnO2/T-SMFCs exhibited a higher power density of 368.99mW/m(3), which was 1.26 and 2.06 times that of SMFCs with MnO2 cathode and open-circuit SMFCs (OC-SMFCs), respectively. Moreover, MnO2/T-SMFCs exhibited the highest total organic carbon (TOC) removal of 55.7 %, which was 1.76 times that of the OC-SMFCs. It also obtained the highest NH4+-N removal of 93.7 %, 40 % higher than OC-SMFCs. The high oxidation reduction reaction (ORR) associated with the MnO2/T cathode is partly attributed to the synergetic effect between MnO2 and tourmaline to change the electronic structure of MnO2 electrode and modify its adsorption/desorption behaviors. PacBio sequencing of 16S rRNA gene amplicons showed that volatile fatty acid- and alcohol-oxidizing Syntrophus and Smithella, and electroactive Geobacter dominated the anode biofilms in the MnO2/T-SMFCs. These results indicated that MnO2/T-SMFCs are effective for sediment bioelectroremediation in contaminated rivers.
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