Investigating the response of electrogenic metabolism to salinity in saline wastewater treatment for optimal energy output via microbial fuel cells

被引：0

作者：

Xiao, Yihang ^{[1
]}

Lin, Sen ^{[2
]}

Hao, Tianwei ^{[1
]}

机构：

[1] Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, China

[2] Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong

来源：

Science of the Total Environment | 2021年 / 783卷

关键词：

Metabolism - Wastewater treatment - Sulfur compounds - Bacteria - Electron transitions - Volatile fatty acids - Substrates;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In the current study, MFCs treating saline wastewater with the different conductivities of 5.0 ± 0.2, 7.7 ± 0.6, 10.5 ± 0.9, 13.0 ± 1.0, 15.3 ± 1.0, and 16.0 ± 0.1 mS/cm were investigated. Increasing salinity drives a considerable shift of microbial communities, and it also affects metabolic pathways in MFCs. Overwhelming acetate oxidizing electron transfer with moderate conductivities between 7.7 and 13.0 mS/cm led to high energy outputs. Power generation at the low conductivities of less than 7.7 mS/cm was restricted by the competition between fermentative bacteria (e.g., Lactobacillus) and exoelectrogens (e.g., Pseudomonas and Shewanella) for substrate utilization. Increasing salinity beyond 13 mS/cm suppressed the fermentation of glucose to butyrate. It also induced sulfidogenesis; sulfide oxidizing bacteria Desulfovibrio (5.2%), Desulfuromonas (3.7%) and exoelectrogen Pseudomonas (1.1%) formed a sulfur-driven current production, thereby resulting in low energy outputs. The present study revealed the effects of ionic conductivity on electrical energy production and provided insights into the dynamics of the MFCs substrate utilization. © 2021 Elsevier B.V.

引用