ABSTRACT

The coupling of constructed wetlands (CW) to microbial fuel cells (MFC) has become a promising hybrid technology due to its high compatibility to generate electricity and remove pollutants from wastewater. In the present study, the bioelectricity production generated from constructed wetlands-microbial fuel cells (CW-MFCs) was evaluated using four species of shade macrophytes: Aglaonema commutatum, Epipremnum aureum, Dranacaena braunni, and Philodendron cordatum. The CW-MFCs were operated in a continuous upflow mode with a hydraulic retention time (HRT) of 4 d. The systems were fed with synthetic water without an external carbon source. The bioelectrochemical systems were operated under diffuse radiation conditions (shadow). Philodendron cordatum was the macrophyte species that produced a maximum voltage of 103 mV, with a power density of 12.5 mW/m². High voltages were obtained when the diffuse radiation in the CW-MFCs was 3000–4000 µmol^.m²/s. The maximum production of root exudates was 20.6 mg/L as total organic carbon for the Philodendron cordatum species. Philodendron cordatum was the macrophyte species that obtained high conversion efficiency (0.0014%), compared to other macrophyte species (< 0.0008%). In the CW-MFCs systems it was observed that the bioelectricity production was mainly due to the quantity of the root exudates released into the rhizospheres of the plants.

摘要

人工湿地 (CW) 与微生物燃料电池 (MFC) 的耦合由于其在发电和去除废水中污染物的高度兼容性而成为一种很有前途的混合技术。在本研究中，使用四种遮荫大型植物评估了人工湿地-微生物燃料电池 (CW-MFC) 产生的生物电：Aglaonema commutatum、Epipremnum aureum、Dranacena braunni和Philodendron cordatum。CW-MFC 以连续上流模式运行，水力停留时间 (HRT) 为 4 天。系统用合成水供给，没有外部碳源。生物电化学系统在漫射辐射条件（阴影）下运行。Philodendron cordatum是一种大型植物，其最大电压为 103 mV，功率密度为 12.5 mW/m ²。当 CW-MFC 中的漫射辐射为 3000–4000 µmol 时，会获得高电压^。米² /秒。根系分泌物的最大产量为 20.6 mg/L 作为Philodendron cordatum物种的总有机碳。与其他大型植物物种（< 0.0008%）相比， Philodendron cordatum是获得高转化效率（0.0014%）的大型植物物种。在 CW-MFCs 系统中，观察到生物电的产生主要是由于释放到植物根际的根系分泌物的数量。