Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 751, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.142292
Keywords
Microcystis aeruginosa biomass; Bio-energy production; Microbial fuel cell; Microcystin-LR degrading bacteria; Toxic cyanobacterial bloom
Categories
Funding
- National Natural Science Foundation of China [51722803]
- Fundamental Research Funds for the Central Universities [2412018ZD013]
- Chinese Academy of Sciences and The World Academy of Sciences (CAS-TWAS) President's Fellowship for International Ph.D. Students
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This study successfully used a co-substrate strategy to eliminate the inhibitory effect of MC-LR toxin on EAB activity in the cyanobacterial biomass-Microbial Fuel Cell system, increasing power output and coulombic efficiency, as well as diversifying the microbial community.
Cyanobacterial biomass is a promising natural resource for power generation, through the reactions biocatalyzed by electrochemically active bacteria (EAB). However, the major limitation is the involvement of Microcystin-LR (MC-LR) in inhibiting EAB activation. In this work, toxic M. aeruginosa biomass was employed as analyte of a microbial fuel cell (MFC), and sodium acetate was applied as easy-to-biodegrade co-substrate to alleviate the MC-LR stress on EAB survival. The running stability was continuously enhanced with the increment of co-substrate concentration. The sufficient co-substrate supply (6.0mM) eliminated the negative effects of MCLR on the cyanobacteria biomass fed-MFC performance; it contributed 12.7% extension on the electric cyclic terms and caused the productions of the power density which was comparable and even 3.8% higher than its corresponding control (MFC treated with acetate alone). The co-substrate addition also increased coulombic efficiency by 60.1%, microcystin-LR removal efficiency increased by 64.7%, and diversified the microbial community with more species able to biodegrade the MC-LR, bio-transforming the metabolites and EAB. Microcystin-degrading bacteria, such as Sphingopyxis sp., Burkholderia-Paraburkholderia, and Bacillus sp., were remarkably increased, and EAB, including Shewanella sp., Desulfovibrio desulfuricans, Aeromonas hydrophila, were also much more enriched in co-substrate use protocol. Therefore, this study verified a co-substrate strategy for simultaneously eliminating MC-LR toxin and enhancing bioelectricity generation from cyanobacterial biomass via an MFC. (C) 2020 Elsevier B.V. All rights reserved.
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