Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Clean Tech One 06-08, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; ETH Zürich, Institute of Environmental Engineering, 8093 Zürich, Switzerland.
Sci Total Environ. 2021 Mar 25;762:144104. doi: 10.1016/j.scitotenv.2020.144104. Epub 2020 Dec 15.
This study aims to investigate the effect of internal recirculation and membrane packing density on the performance (water quality, membrane performance, and microbial community) of a biocarriers facilitated gravity-driven membrane (GDM) reactor under intermittent aeration condition. The results revealed that the presence of internal recirculation in the GDM reactors could effectively improve water quality (especially increasing nitrogen removal) and membrane performance (especially reducing cake layer resistance) compared to those without internal recirculation. In addition, compared to a high packing density membrane module (1150 m/m), a lower packing density membrane module (290 m/m) benefited to improve 15% of nitrogen removal and 44% of permeate flux due to the effective aeration scouring effect and less-limited eukaryotic activity, as well as reduce 20% of total treatment cost. In addition, the presence and absence of internal recirculation could lead to dissimilar microbial community compositions of the biofilms in the GAC layers and on the membrane surfaces. However, the membrane packing density could play an insignificant effect on the microbial community compositions of the biofilms in the GDM reactors with internal recirculation.
本研究旨在探讨内循环和膜填充密度对间歇曝气条件下生物载体重力驱动膜（GDM）反应器性能（水质、膜性能和微生物群落）的影响。结果表明，与无内循环的 GDM 反应器相比，GDM 反应器中的内循环可有效改善水质（特别是提高氮去除率）和膜性能（特别是降低滤饼层阻力）。此外，与高填充密度膜组件（1150 m/m）相比，低填充密度膜组件（290 m/m）由于有效曝气冲刷作用和较少限制真核生物活性，可提高 15%的氮去除率和 44%的渗透通量，并降低 20%的总处理成本。此外，内循环的存在与否会导致 GAC 层和膜表面生物膜的微生物群落组成不同。然而，膜填充密度对内循环 GDM 反应器中生物膜的微生物群落组成影响不大。
