Suppression of phosphorus release from eutrophic lake sediments by sediment microbial fuel cells
Suppression of phosphorus release from eutrophic lake sediments by sediment microbial fuel cells
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DOI：
10.1080/09593330.2021.1890837
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发表时间：
2021-02
影响因子：
2.8
通讯作者：
Yasuyuki Takemura;K. Syutsubo;Keiichi Kubota
中科院分区：
文献类型：
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作者：
Yasuyuki Takemura;K. Syutsubo;Keiichi Kubota
摘要 沉积物微生物燃料电池（SMFC）已作为一种替代技术来抑制磷从湖泊沉积物释放到水体，从而减轻富营养化。然而，磷的调节机制仍不清楚。本研究的目的是了解 SMFC 对间隙水中磷浓度的电化学影响。在本研究中，将实验室规模的 SMFC 应用于闭路 (CC)/开路 (OC) 色谱柱的醋酸盐加标沉积物 (ace+) 和未加标沉积物 (sed)，并切换电路以研究电子转移和磷浓度之间的关系。 CC 柱沉积物间隙水中的溶解总磷 (DTP) 浓度显着下降至 0.1 mg/L 以下，而 OC 柱中的 DTP 浓度在九周内保持较高水平。切换电路后，一周内OC→CC列的DTP下降，但CC→OC列的DTP上升。实验结束时，CC/sed、CC/ace+、OC/sed 和 OC/ace+ 色谱柱中的 DTP 浓度分别为 0.10 ± 0.02、0.03 ± 0.00、0.82 ± 0.01 和 1.66 ± 0.12 mg/L。这些柱各自的估计阳极电容为 2.05 ± 0.49、5.15 ± 0.14、0.72 ± 0.19 和 0.71 ± 0.12 nF。我们得出结论，磷可能被电化学吸引并保留在沉积物中的阳极上，因为吸附的 DTP 含量和增加的阳极电容密切相关。因此，SMFC 可用于抑制富营养化湖泊沉积物中磷的释放。图解摘要
ABSTRACT Sediment microbial fuel cells (SMFCs) have served as an alternative technique to suppress phosphorus release from lake sediments to water bodies and thus mitigate eutrophication. However, the phosphorus regulation mechanism remains unclear. The purpose of this research was to understand the electrochemical influence of an SMFC on the phosphorus concentration in interstitial water. In this study, a lab-scale SMFC was applied to acetate-spiked sediments (ace+) and unspiked sediments (sed) with closed-circuit (CC)/open-circuit (OC) columns, and the circuitry was switched to investigate the relationship between electron transfer and phosphorus concentration. The dissolved total phosphorus (DTP) concentration in the sediment interstitial water in CC columns significantly decreased to below 0.1 mg/L, whereas the DTP in OC columns remained high for nine weeks. After switching the circuit, the DTP in OC→CC columns dropped but that in CC→OC columns increased within one week. At the end of the experimental period, the DTP concentrations in CC/sed, CC/ace+, OC/sed, and OC/ace+ columns were 0.10 ± 0.02, 0.03 ± 0.00, 0.82 ± 0.01, and 1.66 ± 0.12 mg/L, respectively. The respective estimated anode capacitances of those columns were 2.05 ± 0.49, 5.15 ± 0.14, 0.72 ± 0.19, and 0.71 ± 0.12 nF. We concluded that the phosphorus may have been electrochemically attracted and retained on the anode in the sediment because the adsorbed DTP contents and the increased anode capacitances were strongly correlated. Thus, SMFCs can be used for suppressing phosphorus release from eutrophic lake sediments. GRAPHICAL ABSTRACT