Vo Nguyen Xuan Phuong, Dang Nguyen Hoang Dat, Doan Huu Thuy, Doan Van Tuan, Lam Pham Thanh Hien, Vo Nguyen Xuan Que
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, Vietnam.
Environ Technol. 2023 May;44(12):1822-1837. doi: 10.1080/09593330.2021.2014574. Epub 2021 Dec 21.
Vertical up-flow-constructed wetlands integrating with microbial fuel cell (VFCW-MFC) were evaluated for -N removal and bioelectricity recovery. The experiments were carried out in lab-scale VFCW-MFC microcosms treating synthetic domestic wastewater under different operational conditions of pH, hydraulic retention time, and mass loading rate. Effects of wild ornamental grass () on treatment performance and voltage output were investigated simultaneously. Experiments demonstrated that the neutral pH of influents favoured -N removal and power generation. Extended retention time improved treatment capacity and power output but likely depended on the substrate availability. COD removal and power output increased, while -N removal decreased with increasing mass loading rates. At the loading rate of 88.31 mg COD/L.day, planted VFCW-MFCs exhibited better -N treatment performance (36.9%) and higher voltage output (132%-143%) than unplanted systems. Plants did not affect the COD removal efficiency of VFCW-MFCs (>95%). Power density was in the range of 1.26-1.59 mW/m in planted microcosms with a maximum CE of 13.6%. The anode layer accounted for a major proportion of -N removal in VFCW-MFCs. This study implies that -N in domestic wastewaters with relatively high COD:N ratios can be treated effectively in up-flow CW-MFCs via anaerobic processes, including anammox and heterotrophic denitrifying processes. The mass loading rate could be a critical parameter to balance different microbial processes, thus, coincidently determining the potential of power recovery from wastewaters.
对集成微生物燃料电池的垂直上流人工湿地（VFCW-MFC）进行了脱氮和生物电回收评估。实验在实验室规模的VFCW-MFC微观世界中进行，处理不同pH值、水力停留时间和质量负荷率运行条件下的模拟生活污水。同时研究了野生观赏草（）对处理性能和电压输出的影响。实验表明，进水的中性pH值有利于脱氮和发电。延长停留时间提高了处理能力和功率输出，但可能取决于底物的可用性。随着质量负荷率的增加，COD去除率和功率输出增加，而脱氮率降低。在88.31 mg COD/L·天的负荷率下，种植的VFCW-MFCs比未种植的系统表现出更好的脱氮性能（36.9%）和更高的电压输出（132%-143%）。植物不影响VFCW-MFCs的COD去除效率（>95%）。在种植的微观世界中，功率密度在1.26-1.59 mW/m范围内，最大CE为13.6%。阳极层在VFCW-MFCs的脱氮中占主要比例。这项研究表明，COD:N比相对较高的生活污水中的氮可以通过厌氧过程，包括厌氧氨氧化和异养反硝化过程，在上流CW-MFC中得到有效处理。质量负荷率可能是平衡不同微生物过程的关键参数，因此，同时决定了从废水中回收能量的潜力。
