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Title (Primary) Deciphering the fate of sulfate in one- and two-chamber bioelectrochemical systems
Author Dai, S.; Korth, B.; Schwab, L.; Aulenta, F.; Vogt, C.; Harnisch, F.
Journal Electrochimica Acta
Year 2022
Department ISOBIO; UMB
Volume 408
Page From art. 139942
Language englisch
Topic T7 Bioeconomy
T8 Georesources
Keywords bioelectrochemical systems; microbial electrochemical technologies; hydrogen-mediated electron uptake; mixotrophic sulfate reduction; sulfur cycle
Abstract Treatment of wastewaters with high concentration of sulfate before discharge is an environmental imperative. However, current technologies are often highly energy and chemical-demanding. Recently, microbial electrochemical technologies (MET) have been proposed as an alternative and more sustainable approach for the treatment of wastewaters rich in sulfate. Here we compare the sulfate reduction performance of one- and two-chamber reactors. In two-chamber reactors, sulfate reduction to sulfide was achieved with high electron recovery efficiency (83.9 ±1.3 %) at a sulfate reduction rate of 9.7 ±2.6 mgSO42− L−1 d−1 cm−2, whereas in one-chamber reactors apparently no sulfate reduction took place. Non-electrochemical microcosm experiments suggested that sulfate reduction in two-chamber reactors was driven by the availability of cathodically produced H2. In one-chamber reactors, the presence of anodically produced O2 presumably resulted in chemical short circuit including aerobic hydrogen oxidation, abiotic and biotic re-oxidation of sulfide to sulfate. Microbial community analysis demonstrated that sulfate reduction was mainly performed by sulfate reducing prokaryotes (SRP) belonging to the genera Desulfomicrobium and Desulfovibrio, whereas sulfide oxidizing bacteria (SOB) (mainly Acinetobacter and Sulfuricurvum) could be responsible for re-oxidation of sulfide. Thus, fundamental and application-oriented research on microbial electrochemical sulfate reduction ought to be studied in two-chamber reactors for avoiding a potential bias of results by anodic reactions.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=25661
Dai, S., Korth, B., Schwab, L., Aulenta, F., Vogt, C., Harnisch, F. (2022):
Deciphering the fate of sulfate in one- and two-chamber bioelectrochemical systems
Electrochim. Acta 408 , art. 139942