Microbial oxidation of sulfur

Microbial Coal Desulfurization with Thermophilic Microorganisms

Published in Donald L. Wise, Bioprocessing and Biotreatment of Coal, 2017

An explanation of the experimental results is possible based on the role of oxygen in sulfur oxidation and in other microbial activities. In the microbial oxidation of sulfur to sulfate, oxygen serves as the terminal electron acceptor. At oxygen partial pressures lower than 030 atm, the sulfur removal rate increased with increasing oxygen partial pressure due to the higher oxygen transfer rate to the cells. At an 0.14 atm oxygen partial pressure, the solubility of oxygen is approximately 3.8 ppm, which seems to be lower than the critical oxygen concentration. The reduced sulfur removal rate at a high oxygen concentration may be due to inhibition by high oxygen tensions. It was reported earlier that the introduction of high oxygen tensions reduced the growth rate of Thiobacillus strain TH3 [41].

Effects of nitrate and sulfate on the performance and bacterial community structure of membrane-less single-chamber air-cathode microbial fuel cells

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Journal Information

Published in Journal of Environmental Science and Health, Part A, 2018

Yoonjoo Seo, Hyemin Kang, Sumin Chang, Yun-Yeong Lee, Kyung-Suk Cho

Meanwhile, the presence of Thiobacillus, both on the anode and cathode surfaces, can indicate the occurrence of sulfide oxidation in the ML-SC MFC. Microbial oxidation by sulfur-oxidizing bacteria typically results in the production of sulfate. The production of sulfate by microbial sulfide oxidation at the electrode could also explain the lower sulfate removal in comparison to the higher COD removal efficiencies and the lower A/D (%) than ML-SC MFC with the addition of nitrate.

Microbial oxidation of sulfur

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Microbial Coal Desulfurization with Thermophilic Microorganisms

Effects of nitrate and sulfate on the performance and bacterial community structure of membrane-less single-chamber air-cathode microbial fuel cells