Interdisciplinary Program of Environmental Science, Graduate School, Chulalongkorn University, Thailand.
Department of Environmental Engineering, Chulalongkorn University, Thailand; Research Unit on Innovative Waste Treatment and Water Reuse, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
J Environ Manage. 2021 Feb 1;279:111624. doi: 10.1016/j.jenvman.2020.111624. Epub 2020 Nov 13.
This study is to develop a novel integrated single-stage anaerobic co-digestion and oxidation ditch membrane bioreactor (SAC/OD-MBR) for food waste and building wastewater recycling. The co-digestion of food waste (FW) from a canteen with waste sludge (WS) from OD-MBR was performed with the proportion of FW:WS at 10:1 by weight. The liquid digestate from the co-digestion process was further co-treated with building wastewater in the OD-MBR system for water reuse purpose. Maximum methane content of 65.2% in biogas as well as average specific methane yield of 0.24 gCH/gVS could be obtained with anaerobic co-digestion of food waste and waste sludge from OD-MBR with HRT of 24 h and horizontal flow velocity of 0.3 m/s. The observed main methanogen species in this co-digestion process were Methanoculleus bourgensis and Methanoculleus palmolei. For co-treatment of liquid digestate and building wastewater with the OD-MBR, it was found that HRT of 24 h and horizontal flow velocity of 0.3 m/s could achieve highest COD and nitrogen removal efficiencies. HRT can be considered as a main key parameter to promote nitrification activity inside the OD-MBR system. Moreover, treated effluent from the SAC/OD-MBR could comply with the water reuse standard for garden and landscape application in the university campus. Furthermore, the techno-economic analysis indicates that this proposed system has a high potential of total cost savings and other indirect benefits. Therefore, the prototype SAC/OD-MBR can be an alternative system for food waste management and wastewater recycling for building application.
本研究旨在开发一种新型一体化单级厌氧共消化和氧化沟膜生物反应器（SAC/OD-MBR），用于处理食物垃圾和建筑废水并实现再利用。以 10:1 的质量比将食堂食物垃圾（FW）与 OD-MBR 的剩余污泥（WS）进行共消化。共消化过程中的液体消化液将进一步与建筑废水在 OD-MBR 系统中共同处理，以实现水的再利用目的。在 24 小时的水力停留时间（HRT）和 0.3 米/秒的水平流速下，对来自 OD-MBR 的食物垃圾和剩余污泥进行厌氧共消化，可获得最大 65.2%的沼气中甲烷含量和 0.24gCH/gVS 的平均特定甲烷产率。在共消化过程中观察到的主要产甲烷菌是 Methanoculleus bourgensis 和 Methanoculleus palmolei。对于 OD-MBR 中液体消化液和建筑废水的共同处理，发现 24 小时的 HRT 和 0.3 米/秒的水平流速可以实现最高的 COD 和氮去除效率。HRT 可以被视为促进 OD-MBR 系统内部硝化活性的主要关键参数。此外，SAC/OD-MBR 的处理出水可以符合大学校园园林和景观应用的再生水标准。此外，技术经济分析表明，该系统具有节省总成本和其他间接效益的巨大潜力。因此，原型 SAC/OD-MBR 可以作为一种替代系统，用于处理食物垃圾和建筑废水的再利用。
