Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Changchun, 130102, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Changchun, 130102, PR China.
Environ Pollut. 2021 Mar 1;272:115988. doi: 10.1016/j.envpol.2020.115988. Epub 2020 Nov 10.
Constructed wetlands integrated with microbial fuel cells (MFC-CWs) have been recently developed and tested for removing antibiotics. However, the effects of carbon source availability, electron transfer flux and cathode conditions on antibiotics removal in MFC-CWs through co-metabolism remained unclear. In this study, four experiments were conducted in MFC-CW microcosms to investigate the influence of carbon source species and concentrations, external resistance and aeration duration on sulfamethoxazole (SMX) and tetracycline (TC) removal and bioelectricity generation performance. MFC-CWs supplied with glucose as carbon source outperformed other carbon sources, and moderate influent glucose concentration (200 mg L) resulted in the best removal of both SMX and TC. Highest removal percentages of SMX (99.4%) and TC (97.8%) were obtained in MFC-CWs with the external resistance of 700 Ω compared to other external resistance treatments. SMX and TC removal percentages in MFC-CWs were improved by 4.98% and 4.34%, respectively, by increasing the aeration duration to 12 h compared to no aeration. For bioelectricity generation performance, glucose outperformed sodium acetate, sucrose and starch, with the highest voltages of 386 ± 20 mV, maximum power density (MPD) of 123.43 mW m, and coulombic efficiency (CE) of 0.273%. Increasing carbon source concentrations from 100 to 400 mg L, significantly (p < 0.05) increased the voltage and MPD, but decreased the internal resistance and CE. The highest MPD was obtained when the external resistance (700 Ω) was close to the internal resistance (600.11 Ω). Aeration not only improved the voltage and MPD, but also reduced the internal resistance. This study demonstrates that carbon source species and concentrations, external resistances and aeration duration, all play vital roles in regulating SMX and TC removal in MFC-CWs.
人工湿地与微生物燃料电池（MFC-CWs）的组合最近已经开发并测试用于去除抗生素。然而，通过共代谢，碳源的可用性、电子传递通量和阴极条件对 MFC-CWs 中抗生素去除的影响仍不清楚。在这项研究中，在 MFC-CW 微宇宙中进行了四项实验，以研究碳源种类和浓度、外加电阻和曝气时间对磺胺甲恶唑（SMX）和四环素（TC）去除和生物电能产生性能的影响。以葡萄糖作为碳源的 MFC-CWs 表现优于其他碳源，而适当的进水葡萄糖浓度（200mg/L）则导致 SMX 和 TC 的去除效果最佳。与其他外加电阻处理相比，在外加电阻为 700Ω 的 MFC-CWs 中，SMX 的去除率最高（99.4%），TC 的去除率最高（97.8%）。与不曝气相比，曝气时间延长至 12 小时，SMX 和 TC 在 MFC-CWs 中的去除率分别提高了 4.98%和 4.34%。对于生物电能产生性能，葡萄糖优于乙酸钠、蔗糖和淀粉，其电压最高为 386±20mV，最大功率密度（MPD）为 123.43mW/m，库仑效率（CE）为 0.273%。从 100 到 400mg/L 增加碳源浓度，显著（p<0.05）增加了电压和 MPD，但降低了内阻和 CE。当外加电阻（700Ω）接近内阻（600.11Ω）时，获得了最高的 MPD。曝气不仅提高了电压和 MPD，还降低了内阻。本研究表明，碳源种类和浓度、外加电阻和曝气时间在调节 MFC-CWs 中 SMX 和 TC 的去除方面都起着重要作用。
