College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China.
Key Laboratory of Bioelectrochemical Water Pollution Control Technology in Tangshan City, North China University of Science and Technology, Tangshan 063210, China.
Molecules. 2023 Feb 24;28(5):2124. doi: 10.3390/molecules28052124.
A constructed wetland (CW)-coupled microbial fuel cell (MFC) system was constructed to treat wastewater and generate electricity. The total phosphorus in the simulated domestic sewage was used as the treatment target, and the optimal phosphorus removal effect and electricity generation were determined by comparing the changes in substrates, hydraulic retention times, and microorganisms. The mechanism underlying phosphorus removal was also analyzed. By using magnesia and garnet as substrates, the best removal efficiencies of two CW-MFC systems reached 80.3% and 92.4%. Phosphorus removal by the garnet matrix mainly depends on a complex adsorption process, whereas the magnesia system relies on ion exchange reactions. The maximum output voltage and stabilization voltage of the garnet system were higher than those of the magnesia system. Microorganisms in the wetland sediments and electrode also changed considerably. It indicates that the mechanism of phosphorus removal by the substrate in the CW-MFC system is adsorption and chemical reaction between ions to generate precipitation. The population structure of proteobacteria and other microorganisms has an impact on both power generation and phosphorus removal. Combining the advantages of constructed wetlands and microbial fuel cells also improved phosphorus removal in coupled system. Therefore, when studying a CW-MFC system, the selection of electrode materials, matrix, and system structure should be taken into account to find a method that will improve the power generation capacity of the system and remove phosphorus.
构建了湿地（CW）-耦合微生物燃料电池（MFC）系统，以处理废水并发电。以模拟生活污水中的总磷为处理目标，通过比较基质、水力停留时间和微生物的变化，确定最佳的除磷效果和发电效果。还分析了除磷的机理。使用菱镁矿和石榴石作为基质，两个 CW-MFC 系统的最佳去除效率分别达到 80.3%和 92.4%。石榴石基质的除磷主要依赖于复杂的吸附过程，而菱镁矿系统则依赖于离子交换反应。石榴石系统的最大输出电压和稳定电压均高于菱镁矿系统。湿地沉积物和电极中的微生物也发生了很大变化。这表明 CW-MFC 系统中基质的除磷机制是吸附和离子之间的化学反应生成沉淀。变形菌等微生物的种群结构对发电和除磷都有影响。结合湿地和微生物燃料电池的优点也提高了耦合系统的除磷效果。因此，在研究 CW-MFC 系统时，应考虑电极材料、基质和系统结构的选择，以找到一种既能提高系统发电能力又能去除磷的方法。
