Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec J1M 0C8, Canada.
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec J1M 0C8, Canada.
Bioresour Technol. 2015 Jun;186:74-80. doi: 10.1016/j.biortech.2015.03.038. Epub 2015 Mar 13.
Zero liquid discharge is increasingly adopted as an objective for waste treatment process. The objective of this study was to increase the feed total solids (TS) and the organic loading rate (OLR) fed to a novel psychrophilic (20°C) dry anaerobic digestion (PDAD). Duplicate laboratory-scale bioreactors were fed cow feces and wheat straw (35% TS in feed) at OLR of 6.0 g TCOD kg(-1) inoculum d(-1) during long-term operation (147 days consisting of 7 successive cycles). An overall average specific methane yield (SMY) of 151.8±7.9 N L CH4 kg(-1) VS fed with an averaged volatile solids removal of 42.4±4.3% were obtained at a volatile solids-based inoculum-to-substrate ratio (ISR) of 2.13±0.2. The operation was stable as indicated by biogas and VFAs profiles and the results were reproducible in successive cycles; a maximum SMY of 163.3±5.7 N L CH4 kg(-1) VS fed was obtained. Hydrolysis was the reaction limiting step. High rate PDAD of 35% TS dairy manure is possible in sequential batch reactor within 21 days treatment cycle length.
零液体排放越来越多地被视为废物处理过程的目标。本研究的目的是提高新型嗜冷（20°C）干法厌氧消化（PDAD）的进料总固体（TS）和有机负荷率（OLR）。在长期运行（由 7 个连续周期组成的 147 天）中，使用实验室规模的重复生物反应器以 6.0 g TCOD kg（-1）接种物 d（-1）的 OLR 进料奶牛粪便和小麦秸秆（进料中 35% TS）。在挥发性固体基接种物-底物比（ISR）为 2.13±0.2 的情况下，获得了 151.8±7.9 N L CH4 kg（-1）VS 的平均特定甲烷产量（SMY）和 42.4±4.3%的挥发性固体去除率。沼气和 VFAs 曲线表明运行稳定，并且在连续循环中结果可重现；在进料的最大 SMY 为 163.3±5.7 N L CH4 kg（-1）VS 时达到。水解是反应限制步骤。在 21 天的处理周期内，在序批式反应器中可以实现 35% TS 牛奶粪肥的高率 PDAD。
