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摘要
Pilot-scale constructed wetland-microbial fuel cell(CW-MFC) was constructed in stacked, multistage and modular configurations, and their effects the on power generation performance, wastewater purification and physiological and biochemical response of Leersia Hexandra Swartz at different concentrations of 4-chlorophenol (0, 20, 40 and 60 mg·L?1) were studied. The results showed that for the CW-MFC-A, CW-MFC-B, and CW-MFC-C, the highest removal effect occurred at 40 mg·L?1 4-CP, and the highest power generation performance occurred at 60 mg·L?1 4-CP. Simultaneously, the CW-MFC-C reactor had better 4-CP removal effect(66.15%), higher power production voltage(249.0 mV) and power density(96.9 mW·m?3) than CW-MFC-A and CW-MFC-B. The physiological and biochemical response of L. Hexandra in all reactors became worse with increasing 4-CP stress concentration. Meanwhile, at the 4-CP concentration of 60 mg·L?1 with higher power-producing performance, the plant height and biomass in CW-MFC-C were 45.30 cm and 0.237 g·plants?1, respectively, the soluble protein content, chlorophyll content, MDA content, Cleaf, Pn, Tr, and CO2In of its leaves were 6.81 g·L?1, 3.67 mg·g?1, 0.24 μmol·L?1, 0.02 mol·(m2·s)?1, 1.20 μmol·(m2·s)?1, 0.40 mmol·(m2·s)?1 and 852.24 mg·m-3, respectively, and the extent of 4-CP stress in CW-MFC-C was less than that in CW-MFC-A and CW-MFC-B. Furthermore, the design of the L. Hexandra CW-MFC with modular configuration can provide a reference for the governance of 4-CP contaminated wastewater. ? 2023 Science Press.
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