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.
Bioresour Technol. 2022 Feb;346:126583. doi: 10.1016/j.biortech.2021.126583. Epub 2021 Dec 17.
An integrated system combining in pipe thermal pretreatment with a high-solid anaerobic membrane bioreactor (AnMBR) was developed to promote the anaerobic digestion of waste activated sludge (WAS). Two different pretreatment methods investigated were the venturi nozzle treatment (VNT) and steam injector treatment (SIT), both at a low temperature of 70 °C. The biogas production after pretreatment was 23.5-30.5% higher than that of untreated WAS, and the VS based biogas yield was 0.46-0.47 L/g-VS when HRT was 15 days. The membrane operated smoothly when the average flux was 9.6 and 4.5 L/m/h under an MLTS of 25 and 30 g/L, respectively. The calculations of the mass balance indicated that 44-45% COD was converted to methane with pretreatment and only 1% remained in the permeate. That is, high energy recovery and organic matter removal efficiency were achieved for the treatment of WAS using the high-solid AnMBR with in pipe thermal pretreatment.
开发了一种将管内热预处理与高固体厌氧膜生物反应器（AnMBR）相结合的集成系统，以促进废活性污泥（WAS）的厌氧消化。研究了两种不同的预处理方法，即文丘里喷嘴处理（VNT）和蒸汽喷射器处理（SIT），均在 70°C 的低温下进行。预处理后的沼气产量比未经处理的 WAS 高出 23.5-30.5%，当 HRT 为 15 天时，基于 VS 的沼气产率为 0.46-0.47 L/g-VS。当 MLTS 分别为 25 和 30 g/L 时，平均通量分别为 9.6 和 4.5 L/m/h 时，膜运行平稳。质量平衡的计算表明，预处理后有 44-45%的 COD 转化为甲烷，而只有 1%残留在渗滤液中。也就是说，使用带管内热预处理的高固体 AnMBR 处理 WAS 可实现高能量回收和有机物去除效率。
