School of Water Conservancy Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, China; Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian, 116024, China.
School of Water Conservancy Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, China.
Chemosphere. 2020 May;246:125649. doi: 10.1016/j.chemosphere.2019.125649. Epub 2019 Dec 14.
A coupled system consisting of sequencing batch reactor and microbial fuel cell (SBR-MFC) was designed to buffer pH drift and purify wastewater. The addition of nitrifying sludge and the adjustment of hydraulic retention time (HRT) were performed to achieve better removal of total nitrogen (TN). When anaerobic/aerobic/anoxic phases in one cycle were 6/4/2 h, the removal efficiency of ammonium was 99.0 ± 1.3%, whereas denitrification was insufficient and the overall removal efficiency of TN was only 29.1 ± 5.8%. When the phases were adjusted to 6/2/4 h, the removal efficiencies of ammonium were 100.0 ± 0.0% in both closed and open circuits, and the overall removal efficiencies of TN were 91.4 ± 0.2% and 71.7 ± 4.2%, respectively, improved by 20% in MFC mode; the maximum voltage (200 Ω) maintained at 0.1 V. Ammonium-oxidizing bacteria (AOB) and Nitrite-oxidizing bacteria (NOB) in the sludge carried out nitrification. The main denitrification pathways in anoxic phase involved polyhydroxyalkanoate (PHA) denitrification by denitrifying glycogen accumulating organisms (GAOs) and electrochemical denitrification by electrochemical active bacteria (EAB). Few polyphosphate accumulating organisms (PAOs) were present, which accounted for poor P removal.
采用序批式反应器与微生物燃料电池（SBR-MFC）耦合系统，缓冲 pH 值漂移并净化废水。通过添加硝化污泥和调整水力停留时间（HRT），实现总氮（TN）更好的去除。当一个周期中的厌氧/好氧/缺氧阶段分别为 6/4/2 h 时，氨的去除效率为 99.0±1.3%，但反硝化不足，TN 的总去除效率仅为 29.1±5.8%。当阶段调整为 6/2/4 h 时，闭路和开路中氨的去除效率均为 100.0±0.0%，TN 的总去除效率分别为 91.4±0.2%和 71.7±4.2%，在 MFC 模式下提高了 20%；在 0.1 V 下保持最大电压（200 Ω）。污泥中的氨氧化菌（AOB）和亚硝酸盐氧化菌（NOB）进行硝化作用。缺氧阶段的主要反硝化途径包括通过反硝化聚糖积累菌（GAOs）进行聚羟基烷酸酯（PHA）反硝化和通过电化学活性菌（EAB）进行电化学反硝化。存在少量的聚磷酸盐积累菌（PAOs），导致磷的去除效果不佳。
Appl Microbiol Biotechnol. 2017-7-17
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