Bioenergy and Biofuels Research Group, Environmental Research Institute, University College Cork, Cork, Ireland; School of Engineering, University College Cork, Cork, Ireland; Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co. Meath, Ireland.
Bioenergy and Biofuels Research Group, Environmental Research Institute, University College Cork, Cork, Ireland; School of Engineering, University College Cork, Cork, Ireland.
Bioresour Technol. 2014 Dec;173:422-428. doi: 10.1016/j.biortech.2014.09.126. Epub 2014 Oct 2.
This study investigated the feasibility of mono-digesting grass silage, dairy slurry and the co-digestion of the two substrates at a range of concentrations with a specific focus on digester performance while increasing organic loading rate (OLR). The results show that the higher the proportion of grass silage in the substrate mix the higher the specific methane yield (SMY) achieved. Optimum conditions were assessed for 100% grass silage at an OLR of 3.5 kg VS m(-3) d(-1) generating a SMY of 398 L CH4 kg(-1) VS equating to a biomethane efficiency of 1.0. For co-digestion of grass silage with 20% dairy slurry the optimum condition was noted at an OLR of 4.0 kg VS m(-3) d(-1) generating a SMY of 349L CH4 kg(-1) VS and a biomethane efficiency of 1.01. Hydraulic retention times of less than 20 days proved to be a limiting factor in the operation of farm digesters.
本研究旨在探讨在不同浓度下，单独消化草青贮、乳清以及两者共消化的可行性，重点关注提高有机负荷率（OLR）时消化器的性能。结果表明，底物混合物中草青贮的比例越高，获得的特定甲烷产量（SMY）越高。在 3.5kgVS/m3/d 的 OLR 下，100%草青贮的最佳条件下产生了 398L CH4/kg VS，相当于 1.0 的生物甲烷效率。对于草青贮与 20%乳清的共消化，在 4.0kgVS/m3/d 的 OLR 下观察到最佳条件，产生了 349L CH4/kg VS 和 1.01 的生物甲烷效率。水力停留时间小于 20 天被证明是农场消化器运行的一个限制因素。
