Department of Urban Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, Aoba 6-6-06, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
J Water Health. 2024 Jun;22(6):967-977. doi: 10.2166/wh.2024.251. Epub 2024 May 25.
The anaerobic membrane bioreactor (AnMBR) is a promising technology for not only water reclamation but also virus removal; however, the virus removal efficiency of AnMBR has not been fully investigated. Additionally, the removal efficiency estimation requires datasets of virus concentration in influent and effluent, but its monitoring is not easy to perform for practical operation because the virus quantification process is generally time-consuming and requires specialized equipment and trained personnel. Therefore, in this study, we aimed to identify the key, monitorable variables in AnMBR and establish the data-driven models using the selected variables to predict virus removal efficiency. We monitored operational and environmental conditions of AnMBR in Sendai, Japan and measured virus concentration once a week for six months. Spearman's rank correlation analysis revealed that the pH values of influent and mixed liquor suspended solids (MLSS) were strongly correlated with the log reduction value of pepper mild mottle virus, indicating that electrostatic interactions played a dominant role in AnMBR virus removal. Among the candidate models, the random forest model using selected variables including influent and MLSS pH outperformed the others. This study has demonstrated the potential of AnMBR as a viable option for municipal wastewater reclamation with high microbial safety.
厌氧膜生物反应器（AnMBR）不仅在水回收方面具有广阔的应用前景，而且在病毒去除方面也具有很大的潜力。然而，AnMBR 的病毒去除效率尚未得到充分研究。此外，去除效率的估计需要进水和出水的病毒浓度数据集，但由于病毒定量过程通常耗时且需要专门的设备和训练有素的人员，因此在实际操作中并不容易进行监测。因此，在本研究中，我们旨在确定 AnMBR 中的关键、可监测变量，并使用选定的变量建立数据驱动模型，以预测病毒去除效率。我们监测了日本仙台的 AnMBR 的运行和环境条件，并在六个月内每周测量一次病毒浓度。Spearman 秩相关分析表明，进水和混合液悬浮固体（MLSS）的 pH 值与辣椒轻斑驳病毒的对数减少值强烈相关，这表明静电相互作用在 AnMBR 病毒去除中起主导作用。在候选模型中，使用包括进水和 MLSS pH 在内的选定变量的随机森林模型表现优于其他模型。本研究表明，AnMBR 作为一种具有高微生物安全性的城市废水回收的可行选择具有潜力。
