College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China.
College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China.
J Hazard Mater. 2020 Jul 15;394:122542. doi: 10.1016/j.jhazmat.2020.122542. Epub 2020 Mar 18.
This study investigated the effects of radial oxygen loss (ROL) of three different plants on nitrobenzene (NB) wastewater treatment and bioelectricity generation performance in constructed wetland-microbial fuel cell (CW-MFC). ROL and root biomass from wetland plants showed positive effects on NB wastewater compared to unplanted CW-MFC. Scirpus validus exhibited higher tolerance to NB than Typha orientalis and Iris pseudacorus at 20-200 mg/L NB. As NB concentration reached 200 mg/L, the CW-MFC with Scirpus validus had relatively high DO (2.57 ± 0.17 mg/L) and root biomass (16.42 ± 0.18 g/m), which resulted in the highest power density and voltage (19.5 mW/m, 590 mV) as well as NB removal efficiency (93.9 %) among four reactors. High-throughput sequencing results suggested that electrochemically active bacteria (EAB) (e.g., Geobacter, Ferruginibacter) and dominant NB-degrading bacteria (e.g., Comamonas, Pseudomonas) could be enhanced by wetland plants, especially in CW-MFC with Scirpus validus. Therefore, Scirpus validus was a good option for simultaneously treating NB wastewater and producing bioelectricity.
本研究探讨了三种不同植物的径向耗氧（ROL）对人工湿地-微生物燃料电池（CW-MFC）中硝基苯（NB）废水处理和生物电能产生性能的影响。与未种植 CW-MFC 相比，湿地植物的 ROL 和根生物量对 NB 废水具有积极影响。与香蒲和菖蒲相比，芦苇对 20-200mg/L NB 的耐受性更高。当 NB 浓度达到 200mg/L 时，芦苇 CW-MFC 具有相对较高的 DO（2.57±0.17mg/L）和根生物量（16.42±0.18g/m），导致四个反应器中具有最高的功率密度和电压（19.5mW/m，590mV）以及 NB 去除效率（93.9%）。高通量测序结果表明，电化学活性细菌（EAB）（如 Geobacter、Ferruginibacter）和优势 NB 降解菌（如 Comamonas、Pseudomonas）可以被湿地植物增强，特别是在芦苇 CW-MFC 中。因此，芦苇是同时处理 NB 废水和产生生物电能的理想选择。
