Du Runda, Hu Yisong, Nitta Shiori, Ji Jiayuan, Li Yu-You
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
Sci Total Environ. 2022 Dec 15;852:158586. doi: 10.1016/j.scitotenv.2022.158586. Epub 2022 Sep 6.
The anaerobic membrane bioreactor (AnMBR) has gained huge attention as a municipal wastewater (MWW) treatment process that combined high organics removal, a low sludge yield and bioenergy recovery. In this study, a 20 L AnMBR was set up and operated steadily for 70 days in temperate conditions with an HRT of 6 h and a flux of 12 LMH for the treatment of real MWW, focusing on the behavior of the major elements (C, N, P and S) from an elemental balance perspective. The results showed that the AnMBR achieved more than 85 % COD removal, a low sludge yield (0.081 gVSS/gCOD) and high methane production (0.31 L-CH/gCOD) close to the theoretical value. The elemental flow analysis revealed that the AnMBR converted 77 % of the influent COD to methane (57 % gaseous and 20 % dissolved) and 6 % of the COD for sludge production. In addition, the AnMBR converted 34 % of the total carbon to energy-generated carbon, and only 3 % was in the form of CO in the biogas for further upgradation, which was in line with the concept of carbon neutrality. Since little nitrogen or phosphorus were removed, the permeate was nutrient-rich and further treatment to recover the nutrients would be required. This study illustrates the superior performance of the AnMBR for MWW treatment with a microscopic view of elemental behavior and provides a reference for implementing the mainstream AnMBR process in carbon-neutral wastewater treatment plants.
厌氧膜生物反应器（AnMBR）作为一种城市污水处理工艺，因其具有高有机物去除率、低污泥产量和生物能源回收等优点而备受关注。本研究搭建了一个20 L的AnMBR，在温带条件下稳定运行70天，水力停留时间（HRT）为6小时，通量为12 LMH，用于处理实际城市污水，重点从元素平衡的角度研究主要元素（碳、氮、磷和硫）的行为。结果表明，AnMBR的化学需氧量（COD）去除率超过85%，污泥产量低（0.081 gVSS/gCOD），甲烷产量高（0.31 L-CH/gCOD），接近理论值。元素流分析表明，AnMBR将77%的进水COD转化为甲烷（57%为气态，20%为溶解态），6%的COD用于污泥生产。此外，AnMBR将34%的总碳转化为能源生成碳，沼气中仅3%以CO的形式存在，便于进一步升级，这符合碳中和的概念。由于氮和磷去除较少，渗透液富含营养物质，需要进一步处理以回收营养物质。本研究从元素行为的微观角度阐述了AnMBR处理城市污水的卓越性能，为在碳中和污水处理厂实施主流AnMBR工艺提供了参考。
