Sulfate/sulfide removal from wastewater by lab-scale microbial fuel cell

Kieu Thi Quynh Hoa, Phung Minh Hieu, Vy Tuan Anh, Do Chi Linh, Nguyen Thi Ngoc Quynh, Pham Thi Dau, Vuong Thi Nga, Nguyen Thi Yen, Nguyen Van Giang, Nguyen Xuan Canh
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Authors

  • Kieu Thi Quynh Hoa
  • Phung Minh Hieu
  • Vy Tuan Anh
  • Do Chi Linh
  • Nguyen Thi Ngoc Quynh
  • Pham Thi Dau
  • Vuong Thi Nga
  • Nguyen Thi Yen
  • Nguyen Van Giang
  • Nguyen Xuan Canh

DOI:

https://doi.org/10.15625/1811-4989/17110

Abstract

Sulfate/sulfide-containing wastewater is a widespread environmental contaminant resulting from human activities. These pollutants have negative impact on natural ecosystems and human beings. Biological sulfate/sulfide removal can be achieved by reducing sulfate to sulfide with sulfate-reducing bacteria and then oxidizing sulfide to elemental sulfur (So) with sulfide oxidizing bacteria. In sulfate/sulfide contaminant wastewater lacking electron acceptor for sulfide oxidization, excess sulfide will be produced and accumulated in the treatment system. Therefore, microbial fuel cells (MFCs) have been shown to be a promising technique for the removal of sulfate/sulfide pollutants in wastewater. In this study, a lab-scale MFCs has been developed based on the activity of sulfate-reducing bacterium Desulfovibrio. sp. The results showed that sulfate and sulfide removal efficiencies of 74 - 82% (78 ± 2,5%) and 80.8 - 89.1% (~85,6 ± 3,1%) were achieved, respectively, from the 5th day to the 14th day of operation. The voltage of 0.02V and power density of 7.2 to 7.8 mW/m2 was obtained. In this study, sulfide oxidizing-based MFC integrated with sulfate-reducing bioreactor, representing the feasibility of simultaneous sulfate/sulfide pollutants removal and electricity generation in MFCs. This provides a promising treatment system to scale up for its actual applications in sulfate/sulfide removal.

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Published

30-12-2021

How to Cite

Quynh Hoa, K. T., Minh Hieu, P., Tuan Anh, V., Chi Linh, D., Thi Ngoc Quynh, N., Thi Dau, P., Thi Nga, V., Thi Yen, N., Van Giang, N., & Xuan Canh, N. (2021). Sulfate/sulfide removal from wastewater by lab-scale microbial fuel cell. Vietnam Journal of Biotechnology, 19(4), 779–784. https://doi.org/10.15625/1811-4989/17110

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