Ambient operation and large-scale demonstration have limited the implementation and evaluation of anaerobic membrane bioreactors (AnMBRs) for low-strength wastewater treatment. Here, we studied these issues at an AnMBR demo plant that treats domestic wastewater and food waste together at ambient temperatures (7–28 °C). At varied hydraulic retention times (HRTs, 8–42 h), the AnMBR achieved a COD removal efficiency and biogas production of 80.4% ± 3.9% and 66.5 ± 9.4 NL/m3-Influent, respectively. Moreover, a stable high membrane flux of 14.4 L/m2/h was reached. The electric energy consumption for the AnMBR operation was 0.269–0.433 kW·h/m3, and 49.4%–91.3% could be compensated by the electric energy produced from methane production. At an HRT of 10 h, the AnMBR system demonstrated an impressively low net electric energy consumption of merely 0.05 kW·h/m3, resulting in a net greenhouse gas emission of 0.015 CO2-eq/m3, cutting 85% compared to the conventional activated sludge process. Achievements in this study provide key parameters for the ambient operation of AnMBR and demonstrate that AnMBR is an energy-saving and low-carbon solution for low-strength wastewater treatment.

中文翻译：

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厌氧膜生物反应器示范工厂中生活废水和食物垃圾的协同处理：工艺性能、能耗和温室气体排放


常温操作和大规模示范限制了用于低强度废水处理的厌氧膜生物反应器 （AnMBR） 的实施和评估。在这里，我们在 AnMBR 示范工厂研究了这些问题，该工厂在环境温度 （7-28 °C） 下同时处理生活废水和食物垃圾。在不同的水力停留时间 （HRT， 8-42 h） 下，AnMBR 实现了 80.4% ± 3.9% 和 66.5 ± 9.4 NL/m3 进水的 COD 去除效率和沼气产量。此外，达到了 14.4 L/m2/h 的稳定高膜通量。AnMBR 运行的电能消耗为 0.269–0.433 kW·h/m3,49.4%–91.3% 可以通过甲烷生产产生的电能进行补偿。在 10 h 的 HRT 下，AnMBR 系统的净电耗非常低，仅为 0.05 kW·h/m3，导致温室气体净排放量为 0.015 CO2-eq/m3，与传统的活性污泥工艺相比减少了 85%。本研究的成果为 AnMBR 的环境运行提供了关键参数，并证明 AnMBR 是一种节能低碳的低强度废水处理解决方案。