Saha Swakshar, Hussain Abid, Lee Jangho, Lee Eunseok, Lee Hyung-Sool
Dept Civil & Environmental Engineering, University of Waterloo 200 University Ave W, Waterloo, Ontario, Canada, N2L 3G1.
Dept Civil & Environmental Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada, K1S 5B6.
Chemosphere. 2023 Jan;311(Pt 2):137054. doi: 10.1016/j.chemosphere.2022.137054. Epub 2022 Oct 29.
This study developed an integrated LBR - AnMBR system for efficient stabilization and biogas recovery from food waste (FW) at room temperatures (21-22 °C). First, the leachate recirculation rate (4.4-13.2 L/h) was optimized to maximize hydrolysis and acidification yields. The maximum hydrolysis yield of 551 gSCOD/kg VS was achieved at recirculation rate of 13.2 L/h. The VFA concentrations in the FW leachate was as high as 12.5-16.0 g/L, resulting in a high acidification of 468 g COD/kg VS. The solubilized FW was further stabilized by feeding the leachate to AnMBR. Different hydraulic (HRT) and solids retention times (SRT) were tested to achieve high COD removal and methane yields. High COD removal of 86 ± 3% was obtained in the AnMBR at HRT of 13 and SRT of 75 days. High biogas recovery of about 850 kWh per ton FW was achieved along with high quality of AnMBR permeates containing low COD concentration but advantageously high concentration of nutrients (NH-N 317-403 mg/L, total phosphate 23-213 mg/L) without any particulates, which can be reused for landscape or liquid fertilizer.
本研究开发了一种集成式渗滤液回流厌氧膜生物反应器（LBR - AnMBR）系统，用于在室温（21 - 22°C）下从食物垃圾（FW）中高效实现稳定化并回收沼气。首先，对渗滤液回流速率（4.4 - 13.2 L/h）进行了优化，以最大化水解和酸化产率。在回流速率为13.2 L/h时，实现了551 gSCOD/kg VS的最大水解产率。食物垃圾渗滤液中的挥发性脂肪酸（VFA）浓度高达12.5 - 16.0 g/L，导致468 g COD/kg VS的高酸化率。通过将渗滤液送入厌氧膜生物反应器，使溶解的食物垃圾进一步稳定化。测试了不同的水力停留时间（HRT）和固体停留时间（SRT）以实现高化学需氧量（COD）去除率和甲烷产量。在HRT为13天和SRT为75天的条件下，厌氧膜生物反应器实现了86±3%的高COD去除率。实现了每吨食物垃圾约850千瓦时的高沼气回收率，同时厌氧膜生物反应器渗透液质量高，COD浓度低，但有利的是营养物浓度高（NH-N 317 - 403 mg/L，总磷23 - 213 mg/L），且无任何颗粒物，可再用于景观或液体肥料。
