Geobacter sp. SD-1 with enhanced electrochemical activity in high-salt concentration solutions

Environmental Microbiology Reports
Dan SunBruce E Logan

Abstract

An isolate, designated strain SD-1, was obtained from a biofilm dominated by Geobacter sulfurreducens in a microbial fuel cell. The electrochemical activity of strain SD-1 was compared with type strains, G. sulfurreducens PCA and Geobacter metallireducens GS-15, and a mixed culture in microbial electrolysis cells. SD-1 produced a maximum current density of 290 ± 29 A m−3 in a high-concentration phosphate buffer solution (PBS-H, 200 mM). This current density was significantly higher than that produced by the mixed culture (189 ± 44 A m−3) or the type strains (< 70 A m−3). In a highly saline water (SW; 50 mM PBS and 650 mM NaCl), current by SD-1 (158 ± 4 A m−3) was reduced by 28% compared with 50 mM PBS (220 ± 4 A m−3), but it was still higher than that of the mixed culture (147 ± 19 A m−3), and strains PCA and GS-15 did not produce any current. Electrochemical tests showed that the improved performance of SD-1 was due to its lower charge transfer resistance and more negative potentials produced at higher current densities. These results show that the electrochemical activity of SD-1 was significantly different than other Geobacter strains and mixed cultures in terms of its salt tolerance.

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Citations

Jun 11, 2015·AMB Express·Morio MiyaharaKazuya Watanabe
Oct 21, 2015·Frontiers in Microbiology·Ember M Morrissey, Rima B Franklin
Jan 14, 2020·Nanotechnology·Mon Oo YeeAmelia-Elena Rotaru
Jul 24, 2014·International Journal of Systematic and Evolutionary Microbiology·Dan SunBruce E Logan
Nov 3, 2020·The Science of the Total Environment·Fei GuoHong Liu
Dec 6, 2014·Environmental Science & Technology·Xiuping ZhuBruce E Logan
Jun 16, 2015·Environmental Science & Technology·Lu LuZhiyong Jason Ren
Oct 20, 2018·Environmental Science & Technology·Yu-Rong LiuBaohua Gu
Mar 27, 2015·Environmental Science & Technology·Dan SunKefa Cen
Oct 23, 2021·Environmental Science & Technology·Xuejun YanXin Wang

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