Centre for Technology in Water and Wastewater, University of Technology Sydney, NSW 2007, Australia.
Centre for Technology in Water and Wastewater, University of Technology Sydney, NSW 2007, Australia; Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China.
Sci Total Environ. 2020 Sep 10;734:139220. doi: 10.1016/j.scitotenv.2020.139220. Epub 2020 May 6.
Nutrients recovery has become a meaningful solution to address shortage in the fertilizer production which is the key issue of nations' food security. The concept of municipal wastewater is based on its ability to be a major potential source for recovered nutrients because of its vast quantity and nutrient-rich base. Microbial fuel cell (MFC) has emerged as a sustainable technology, which is able to recover nutrients and simultaneously generate electricity. In this study a two-chambered MFC was constructed, and operated in a continuous flow mode employing artificial municipal wastewater as a substrate. The effects of hydraulic retention time (HRT) on the recovery of nutrients by MFC were studied. The COD removal rates were insignificantly influenced by varying HRT from 0.35 to 0.69 d, that were over 92%. Furthermore, the recovery rate of nutrients was insignificantly affected while increasing the HRT, which fluctuates from 80% to 90%. In contrast, the maximum power generation declined when HRT increased and the lowest one was 510.3 mV at the HRT of 0.35 d. These results demonstrate that the lab-scale double chamber MFC using municipal wastewater as the substrate can provide a highly effective removal strategy for organic matter, nutrients recovery and electricity output when operating at a specific HRT.
营养物质回收已成为解决化肥生产短缺这一关乎国家粮食安全关键问题的有效手段。城市污水之所以被视为回收营养物质的主要潜在来源，是因为其数量巨大且富含营养物质。微生物燃料电池（MFC）作为一种可持续技术，能够回收营养物质并同时发电。本研究构建了一个双室 MFC，并以人工城市污水为基质连续流模式运行。考察了水力停留时间（HRT）对 MFC 回收营养物质的影响。HRT 从 0.35 到 0.69 d 变化时，COD 去除率无显著影响，均超过 92%。此外，随着 HRT 的增加，营养物质的回收率变化不大，波动在 80%至 90%之间。相比之下，当 HRT 增加时，最大功率输出会下降，在 HRT 为 0.35 d 时，最低值为 510.3 mV。这些结果表明，以城市污水为基质的实验室规模双室 MFC 在特定 HRT 下运行时，可为有机物的高效去除、营养物质的回收和电能输出提供一种策略。
