記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Water Process Engineering  

The formation of sulfolane by-products (e.g., sulfate) is often a consequence of biological treatment because sulfates in groundwater are converted to toxic hydrogen sulfide if there is little dissolved oxygen. This study inoculates sulfolane-degrading bacteria (Pseudomonas sp. YATO411) and sulfate-reducing bacteria (Shewanella) in a laboratory-scale microbial fuel cell (MFC) to determine the electrochemical activity and changes in the microbial community, to increase the removal of sulfolane and by-products from contaminated groundwater. The toxicity of groundwater that is treated using a MFC is determined using the intensity of the bioluminescence from toxicity-sensitive Vibrio fischeri. The respective sulfolane removal rates for sulfolane-degrading bacteria are 10 mg/L/day, 11 mg/L/day and 7.5 mg/L/day for sulfolane concentrations of 50 mg/L, 100 mg/L and 200 mg/L. However, a MFC that uses Shewanella has a respective sulfolane removal rate of 16.67 mg/L/day, 12.5 mg/L/day and 12.5 mg/L/day. The concentration of sulfate decreases and the output voltage increases (1.18–1.65 times) if Shewanella is used for the MFC system. A biotoxicity assessment shows that inhibition of the luminescence of Vibrio fischeri in synthetic groundwater using a sulfolane concentration of 200 mg/L that is treated using a MFC decreases significantly from 93.72 % to 8.28 % after 15 min of exposure, which is similar to the background value of 6.3 % (natural death of the Vibrio fischeri). This shows that the MFC and a process of bioaugmentation reduce toxicity.

DOI： 10.1016/j.jwpe.2023.104106

Web of Science

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Process Safety and Environmental Protection  

This study increases the mass transfer of hydrophobic contaminants in a microbial fuel cell-based trickling filter (MFC/TF) by adding non-aqueous phase liquid. The removal efficiency, mineralization efficiency and elimination capacity of styrene are respectively increased by 1.56 times, 1.86 times and 1.52 times, the power density is increased by 2.6 times and the internal resistance is reduced by approximately 22% after adding 10% silicone oil to the MFC/TF. This is mainly attributed to a decrease in the internal resistance after adding silicone oil, which increases electron transfer on the surface of the auxiliary anode packing and increases the number of electricity-producing bacteria. Adding 10% silicone oil to the MFC/TF increases the number of degrading bacteria and electricity-generating bacteria in the MFC/TF by 2.3–2.5 times. The performance of the MFC/TF using 10% silicone oil is significantly increased because there is increased mass transfer of styrene in the MFC/TF and increased power generation.

DOI： 10.1016/j.psep.2023.07.069

Web of Science

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.scitotenv.2022.160952