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嵇斌, 赵亚乾, 杨扬, 邰义萍, 黎绮文, 卫婷. 人工湿地微生物燃料电池耦合系统对典型全氟化合物的去除效果[J]. 水生生物学报, 2022, 46(10): 1429-1436. DOI: 10.7541/2023.2022.0114
引用本文: 嵇斌, 赵亚乾, 杨扬, 邰义萍, 黎绮文, 卫婷. 人工湿地微生物燃料电池耦合系统对典型全氟化合物的去除效果[J]. 水生生物学报, 2022, 46(10): 1429-1436. DOI: 10.7541/2023.2022.0114
JI Bin, ZHAO Ya-Qian, YANG Yang, TAI Yi-Ping, LI Qi-Wen, WEI Ting. REMOVAL OF TYPICAL PERFLUOROALKYL SUBSTANCES BY MICROBIAL FUEL CELL COUPLING CONSTRUCTED WETLAND SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(10): 1429-1436. DOI: 10.7541/2023.2022.0114
Citation: JI Bin, ZHAO Ya-Qian, YANG Yang, TAI Yi-Ping, LI Qi-Wen, WEI Ting. REMOVAL OF TYPICAL PERFLUOROALKYL SUBSTANCES BY MICROBIAL FUEL CELL COUPLING CONSTRUCTED WETLAND SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(10): 1429-1436. DOI: 10.7541/2023.2022.0114

人工湿地微生物燃料电池耦合系统对典型全氟化合物的去除效果

REMOVAL OF TYPICAL PERFLUOROALKYL SUBSTANCES BY MICROBIAL FUEL CELL COUPLING CONSTRUCTED WETLAND SYSTEM

  • 摘要: 针对污水中传统污染物和新污染物的共存特征, 以典型全氟化合物(PFASs)为目标新污染物, 探究人工湿地微生物燃料技术(CW-MFC)处理含PFASs污水的效果, 构建了不同电路运行模式下的CW-MFC体系, 研究了CW-MFC对PFASs的去除效果, 并探讨PFASs添加后对传统污染物去除和生物电化学性能的影响。结果表明CW-MFC系统在开路和闭路运行下均能够有效去除废水中96%以上的PFASs。在PFASs介入后, 对CW-MFC系统有机物和磷的去除无显著影响, 然而系统的脱氮效率和生物电转化性能均发生了一定程度的降低。在闭路运行工况下, CW-MFC系统的氨氮去除率和输出电压分别下降了7.22%和7.32%; CW-MFC开路运行时总氮去除率降低了13.98%。研究为水环境中PFASs污染的治理技术提供有益探索。

     

    Abstract: Per- and polyfluoroalkyl substances (PFASs) are widespread and persistent in aquatic environments, their toxicity and bioaccumulation are the great concern among the scientific community and the public. Wastewater is regarded as a significant sink for PFASs. However, the effluents of wastewater treatment plants (WWTPs) can still cause aquatic problems due to the low removal efficiency of PFASs in the WWTPs. As an efficient and eco-friendly wastewater treatment and environmental cleanup technology, constructed wetland (CW) has been popularly used worldwide for treating various wastewaters. Several studies have investigated wetlands (natural or/and treatment wetlands) to remove PFASs from aqueous environments. The conventional CW system works on the principles of plant uptake, bioaccumulation, and substrate sorption to remove PFASs. The newly developed CW-microbial fuel technology (CW-MFC), as an intensified CW system, can simultaneously achieve enhanced wastewater treatment and bioenergy recovery and could open an integrated while eco-friendly way for PFASs removal. However, so far, no study has investigated the PFASs removal and their effects on the performance of the CW-MFC system. Therefore, the objective of this study was to explore the removal performance of PFASs by CW-MFC system under the coexistence of conventional contaminants in wastewater. Two CW-MFC systems were designed in closed- and/or open-circuit operating modes, respectively. Firstly, the removal performance of PFASs under different configurations was investigated and compared. The effects of PFASs on conventional contaminants' removal and bioelectrochemical performance of CW-MFC systems were then explored. When the concentrations of PFOA and PFOS in the influent were 6.46±0.52 and 9.34±0.87 μg/L, respectively, both closed-circuit and open-circuit operation of the CW-MFC systems demonstrated over 96% removal performance of PFAS. These results indicate that the CW-MFC system can effectively remove PFASs from wastewater, regardless of whether it is operated in an open or closed circuit. Moreover, the results showed that the removals of COD and TP in CW-MFC systems were less affected by PFASs under the influent COD and TP concentrations of 400 and 2.5 mg/L, respectively. However, with the efficient removal of PFASs, organic matter, and TP, some adverse effects on system performance were observed. For example, the \rmNH_4^+\text-N and TN removal rates were decreased by approximately 7.22% and 2.45%, in the closed-circuit system, while those were sharply dropped by 13.51% and 13.98%, in the open-circuit system, respectively. Specifically, the average output voltage of the closed-circuit CW-MFC system decreased by 7.32% under the stress of PFASs. Anyhow, the outlook of CW-MFC treatment of PFASs shows promising from the aspects of the economy and potential degradation mechanism. Our study highlights that the CW-MFC system owns the potential to remove PFASs from the aqueous phase in an eco-friendly and cost-effective approach and provides important insights into the effects of the conventional contaminants’ removal and bioenergy variations before and during the PFASs co-existence. Overall, this study provides useful information for PFASs remediation in the aquatic environment for further study.

     

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