Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Bioresour Technol. 2017 Oct;241:821-829. doi: 10.1016/j.biortech.2017.06.017. Epub 2017 Jun 14.
The aim of this study is to investigate the effect of sulfate-reducing bacteria on performance of a mixed culture microbial electrosynthesis system (MES). The two-chamber MESs were operated under different cathode potentials (-0.5, -0.6, -0.7, and -0.8V) with or without addition of 6mM sulfate. At -0.7V, acetate production and electrons harvesting in the MES with the sulfate addition were 31.81mM and 5152C, respectively, which improved by 2.7 and 2.4times compared to that without sulfate. With sulfate, the biomass, proportion of live cells, and electrochemical activity of cathode biofilm were enhanced at all the potentials. At -0.7V, the relative abundance of Acetobacterium and Desulfovibrionaceae was 14.2% and 36.7% with sulfate, respectively, compared to 17.4% and 7.3% without sulfate. At -0.7 and -0.8V, the sulfate-reducing bacteria can promote the electron transfer of cathode biofilm and enhance the acetate production.
本研究旨在探讨硫酸盐还原菌对混合培养微生物电解合成系统（MES）性能的影响。采用两室 MES，在不同的阴极电位（-0.5、-0.6、-0.7 和-0.8V）下运行，或添加或不添加 6mM 硫酸盐。在-0.7V 时，添加硫酸盐的 MES 中乙酸盐的产量和电子收率分别为 31.81mM 和 5152C，与不添加硫酸盐相比分别提高了 2.7 倍和 2.4 倍。有硫酸盐时，在所有电位下，阴极生物膜的生物量、活细胞比例和电化学活性都得到了增强。在-0.7V 时，有硫酸盐时乙酸菌和脱硫弧菌的相对丰度分别为 14.2%和 36.7%，而无硫酸盐时分别为 17.4%和 7.3%。在-0.7 和-0.8V 时，硫酸盐还原菌可以促进阴极生物膜的电子传递，从而提高乙酸盐的产量。
