Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 728, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.138011
Keywords
Chlorella vulgaris; Sediment microbial fuel cells; Electricity generation; Decontamination; Synergistic relationship
Categories
Funding
- Fundamental Research Funds for the Central Universities [2232019D321]
- National Natural Science Foundation of China [51909034, 51679041]
- National Key Research and Development Program of China [2019YFC0408604]
- Shanghai Sailing Program [19YF1401900]
- Shanghai Rising-Star Program [19QC1401100]
- China Postdoctoral Science Foundation [2018M641894]
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The lack of electron acceptors in cathode has limited the widespread application of sediment microbial fuel cells (SMFCs). In this study, Chlorella vulgaris (C. vulgaris) was added to the cathode to produce oxygen as an electron acceptor. The synergistic effects between C. vulgaris and electrogenic microorganisms in SMFCs were investigated, and were shown to enhance biodegradation of organic matter in sediments and convert chemical energy into electrical energy. Results showed that the addition of C. vulgaris on the cathode of SMFCs significantly reduced their internal resistance. The low algae concentration SMFC group reduced the initial internal resistance by 67.4% under illumination and produced a maximum power density of 5.17 W/m(3), which was 6 times higher than that of SMFCs without addition of C. vulgaris. We also obtained organic matter removal efficiencies 37.2% higher after 16 days, which accelerated the startup time for three times. It was demonstrated that IEF-N and OP, respectively, were forms of nitrogen and phosphorus removed by SMFCs. Additionally, high-throughput sequencing of microbial communities indicated that C. vulgaris increased the abundance of electrogenic bacteria (Geobacter and Desulfobulbaceae) in the anode and types of photosynthetic bacteria that support oxygen production in the cathode. The combined application of microalgae- and SMFC-based technologies offer a promising remediation approach for organically-contaminated sediments.
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