Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan.
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan; Material Cycles Division, National Institute for Environmental Studies, Tsukuba 305-8506, Japan.
Sci Total Environ. 2022 Nov 10;846:157435. doi: 10.1016/j.scitotenv.2022.157435. Epub 2022 Jul 18.
High solid anaerobic membrane bioreactor (HSAnMBR) is widely applied in biomass treatment and energy regeneration, while membrane operation performance and membrane fouling control remain critical issues. In this study, a HSAnMBR was utilized for waste activated sludge (WAS) treatment at organic loading rates of 3.69-3.72 gCOD/L·d and biogas yield was ranged in 0.38-0.39 L/gVS with the COD conversion efficiency of 40 %. The membrane operated stably when the average flux was 9.6, 4.5 and 1.2 L/m/h at mixed liquor total solid of 25, 30 and 40 g/L with a filtration: relaxation of 4:1, 1:1 and 1:2, respectively. The distinctive characteristics of membrane fouling at high solid condition were that the polysaccharides and proteins had high fouling propensity and were the main composition of the foulant layer. Furthermore, phosphorus and magnesium were the predominant causes of inorganic fouling. The minerals precipitated on the membrane and were embedded into membrane pores, contributing to cake layer formation and pore blocking. This research provided a comprehensive analysis of the membrane operation characterization and fouling mechanisms of HSAnMBR, which was expected to push forward HSAnMBR applications to WAS treatment.
高固体厌氧膜生物反应器（HSAnMBR）广泛应用于生物质处理和能源再生，但其膜运行性能和膜污染控制仍然是关键问题。本研究采用 HSAnMBR 处理废水活性污泥（WAS），在有机负荷率为 3.69-3.72 gCOD/L·d 的条件下，沼气产率在 0.38-0.39 L/gVS 之间，COD 转化率为 40%。当混合液总固体（MLSS）分别为 25、30 和 40 g/L 时，平均通量为 9.6、4.5 和 1.2 L/m/h，过滤：松弛比分别为 4:1、1:1 和 1:2，膜运行稳定。在高固体条件下，膜污染的显著特点是多糖和蛋白质具有较高的污染倾向，是污染物层的主要组成部分。此外，磷和镁是无机污染的主要原因。矿物质在膜上沉淀并嵌入膜孔中，导致滤饼层形成和孔堵塞。本研究对 HSAnMBR 的膜运行特性和污染机制进行了全面分析，有望推动 HSAnMBR 在 WAS 处理中的应用。
