Journal
ENVIRONMENTAL TECHNOLOGY
Volume 34, Issue 2, Pages 269-274Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2012.692715
Keywords
microbial fuel cells; sulfide; sulfur; sulfate; wastewater treatment
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Funding
- National Natural Science Foundation of China (NSFC) [20906026]
- Shanghai Pujiang Program [09PJ1402900]
- Fundamental Research Funds for the Central Universities [WB0914036]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [B200-C-0904]
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This work focused on studying the effect of the chemical oxidation demand to sulfide ratio (COD/S) on power generation and sulfide oxidation in microbial fuel cells treating sulfide-rich wastewater containing organic contaminants. The maximum power density achieved was 20 +/- 1 W m -3 V Anode and the Coulombic yield was 20 +/- 2%. The COD/S of influent played an important role in elemental sulfur and sulfate production because of competition between acetate oxidation and element sulfur oxidation to sulfate in the anode. When the COD/S was 12.50/1, more than 74.0% of sulfide was converted into elemental sulfur after 24 hours of operation. The effect of the COD/S on power generation was negligible when the COD/S ranged between 4.85/1 and 18.53/1. After 24 hours, the COD removals were 110 +/- 6, 213 +/- 9, 375 +/- 8 and 410 +/- 10 mg l -1 when the COD/S was 4.85/1, 8.9/1, 12.5/1 and 18.53/1, respectively. The COD removal increased with the increasing COD of the influent, which fitted to the model of first-order reaction kinetics.
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