Aarhus University, Department of Engineering, Blichers Allé 20, DK 8830, Tjele, Denmark.
Bioresour Technol. 2012 Jun;114:195-200. doi: 10.1016/j.biortech.2012.03.041. Epub 2012 Mar 19.
This study examined the potential for partly substituting dairy cow manure (DCM) with solids from solid to liquid separation of acidified dairy cow manure (SFDCM) during thermophilic anaerobic digestion. Three different substituting levels with a maximum of 30% substitution were tested. All digesters substituting DCM with SFDCM showed a stable biogas production with low volatile fatty acid concentrations after a short transition period. An increased methane yield in terms of digester volume compared to DCM alone was obtained with increasing amount of SFDCM and about 50% more methane was achieved when 30% of DCM was substituted with SFDCM. The digestates were subsequently digested in a post digestion, during which the methane yield increased proportionally with increasing amounts of SFDCM. It can be concluded that SFDCM is a suitable biomass for co-digestion and can be used to increase methane yield in terms of digester volume at ratios up to at least 30%.
本研究考察了在高温厌氧消化过程中，用酸化奶牛粪便固液分离得到的固体（SFDCM）部分替代奶牛粪便（DCM）的可能性。测试了三个不同的替代水平，最大替代率为 30%。所有用 SFDCM 替代 DCM 的消化器在短的过渡阶段后都表现出稳定的沼气生产和低挥发性脂肪酸浓度。随着 SFDCM 用量的增加，与单独使用 DCM 相比，在消化器体积方面的甲烷产量有所增加，当用 30%的 DCM 替代 SFDCM 时，甲烷产量增加了约 50%。随后，在后续消化中对消化物进行了消化，在此过程中，随着 SFDCM 用量的增加，甲烷产量成比例增加。可以得出结论，SFDCM 是一种适合共消化的生物质，可以用于提高消化器体积的甲烷产量，最高可达至少 30%的替代率。
