Institute for Environment and Resources, 142 To Hien Thanh Street, District 10, Ho Chi Minh City, 700000, Viet Nam; Vietnam National University Ho Chi Minh (VNU-HCM), Linh Trung Ward, Ho Chi Minh City, 700000, Viet Nam.
Vietnam National University Ho Chi Minh (VNU-HCM), Linh Trung Ward, Ho Chi Minh City, 700000, Viet Nam; Centre Asiatique de Recherche sur L'Eau (CARE) & Faculty of Civil Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam.
Chemosphere. 2022 Dec;309(Pt 1):136537. doi: 10.1016/j.chemosphere.2022.136537. Epub 2022 Sep 20.
Co-digestion of organic waste and wastewater is receiving increased attention as a plausible waste management approach toward energy recovery. However, traditional anaerobic processes for co-digestion are particularly susceptible to severe organic loading rates (OLRs) under long-term treatment. To enhance technological feasibility, this work presented a two-stage Anaerobic Membrane Bioreactor (2 S-AnMBR) composed of a hydrolysis reactor (HR) followed by an anaerobic membrane bioreactor (AnMBR) for long-term co-digestion of food waste and kitchen wastewater. The OLRs were expanded from 4.5, 5.6, and 6.9 kg COD m d to optimize biogas yield, nitrogen recovery, and membrane fouling at ambient temperatures of 25-32 °C. Results showed that specific methane production of UASB was 249 ± 7 L CH kg COD at the OLR of 6.9 kg TCOD m d. Total Chemical Oxygen Demand (TCOD) loss by hydrolysis was 21.6% of the input TCOD load at the hydraulic retention time (HRT) of 2 days. However, low total volatile fatty acid concentrations were found in the AnMBR, indicating that a sufficiently high hydrolysis efficiency could be accomplished with a short HRT. Furthermore, using AnMBR structure consisting of an Upflow Anaerobic Sludge Blanket Reactor (UASB) followed by a side-stream ultrafiltration membrane alleviated cake membrane fouling. The wasted digestate from the AnMBR comprised 42-47% Total Kjeldahl Nitrogen (TKN) and 57-68% total phosphorous loading, making it suitable for use in soil amendments or fertilizers. Finally, the predominance of fine particles (D10 = 0.8 μm) in the ultrafiltration membrane housing (UFMH) could lead to a faster increase in trans-membrane pressure during the filtration process.
有机废物与废水的共消化作为一种可行的能源回收废物管理方法，受到了越来越多的关注。然而，传统的厌氧共消化工艺在长期处理过程中对高有机负荷率（OLR）特别敏感。为了提高技术可行性，本研究提出了一种由水解反应器（HR）和厌氧膜生物反应器（AnMBR）组成的两段式厌氧膜生物反应器（2S-AnMBR），用于长期共消化食物垃圾和厨房废水。OLR 从 4.5、5.6 和 6.9 kg COD m d 扩展到优化沼气产量、氮回收和环境温度为 25-32°C 时的膜污染。结果表明，在 OLR 为 6.9 kg TCOD m d 时，UASB 的比甲烷产率为 249±7 L CH kg COD。在水力停留时间（HRT）为 2 天的情况下，水解对 TCOD 的去除率为输入 TCOD 负荷的 21.6%。然而，在 AnMBR 中发现总挥发性脂肪酸（VFA）浓度较低，表明可以通过较短的 HRT 实现足够高的水解效率。此外，使用由上流式厌氧污泥床（UASB）和侧流超滤膜组成的 AnMBR 结构可以缓解膜滤饼污染。AnMBR 产生的废弃消化物含有 42-47%的总凯氏氮（TKN）和 57-68%的总磷负荷，适合用作土壤改良剂或肥料。最后，超滤膜组件（UFMH）中细颗粒（D10=0.8 μm）的优势可能导致在过滤过程中跨膜压力更快增加。
