Efficient sulfur cycling improved the performance of flowback water treatment in a microbial fuel cell

文献类型： 外文期刊

第一作者： Zhang, Xiaoting

作者： Zhang, Xiaoting;Wei, Shiqiang;Zhang, Xiaoting;Wei, Shiqiang;Zhang, Xiaoting;Zhang, Daijun;Lu, Peili;Zhang, Daijun;Lu, Peili;Huang, Yongkui

作者机构：

关键词： Flowback water treatment; Fluctuant sulfate concentration; Microbial fuel cell; Stability; Power generation

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）

ISSN： 0301-4797

年卷期： 2022 年 323 卷

页码：

收录情况： SCI

摘要： The sulfate-reducing mediate microbial fuel cell (MFC) shows advantages in treating recalcitrant flowback water (FW) from shale gas extraction, but the stability under fluctuant concentrations of sulfate in FW remains un-known. Herein, we investigated the impact of fluctuant sulfate concentrations on the performance of FW treatment in MFCs. Sulfate concentration showed a significant role in the MFC treating FW, with a COD removal of 69.8 +/- 9.7% and a peak power density of 2164 +/- 396 mW/m3 under 247.5 mg/L sulfate, but only 39.1% and 1216 mW/m3 under 50 mg/L sulfate. The fluctuation of sulfate in a short time allowed to a stable performance, but a longtime intermittent decrease of feeding sulfate concentration significantly inhibited power generation to no more than 512 mW/m3. The sulfur cycling between sulfate and sulfide existed in the system, but the cycling rate became much lower after the longtime intermittent decrease, with resulting to the decreased power gen-eration. Abundant sulfur-oxidizing bacteria (SOB) of Desulfuromonadaceae and Helicobacteraceae in the MFC stably feeding with 247.5 mg/L sulfate supported a high sulfur cycling rate. With the cooperation of abundant sulfate-reducing bacteria (SRB) of Desulfovibrionaceae (capable of producing electricity) on the anode and Desulfobacteraceae in anolyte, this sulfur cycling endowed the MFC with high sulfate tolerance and critically contributed to recalcitrant organics removal and power generation. However, much less SOB of Helicobacteraceae and Campylobacteraceae on the anode with high S0 accumulation on the surface after the longtime intermittent decrease of sulfate likely led to the low sulfur cycling rate. With also less SRB of Marinilabiaceae (capable of producing electricity) and Synergistaceae in the system, this low sulfur cycling rate thus hampered power gen-eration. This research provides an important reference for the bioelectrochemical treatment of wastewater containing recalcitrant organics and sulfate.

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