University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, FI-40014 University of Jyväskylä, Finland.
Bioresour Technol. 2012 Jan;104:28-36. doi: 10.1016/j.biortech.2011.09.104. Epub 2011 Oct 7.
Co-digestion of rendering and slaughterhouse wastes was studied in laboratory scale semi-continuously fed continuously stirred tank reactors (CSTRs) at 35 and 55 °C. All in all, 10 different rendering plant and slaughterhouse waste fractions were characterised showing high contents of lipids and proteins, and methane potentials of 262-572 dm(3)CH(4)/kg volatile solids(VS)(added). In mesophilic CSTR methane yields of ca 720 dm(3) CH(4)/kg VS(fed) were obtained with organic loading rates (OLR) of 1.0 and 1.5 kg VS/m(3) d, and hydraulic retention time (HRT) of 50 d. For thermophilic process, the lowest studied OLR of 1.5 kg VS/m(3) d, turned to be unstable after operation of 1.5 HRT, due to accumulating ammonia, volatile fatty acids (VFAs) and probably also long chain fatty acids (LCFAs). In conclusion, mesophilic process was found to be more feasible for co-digestion than thermophilic process, methane yields being higher and process more stable in mesophilic conditions.
在 35 和 55°C 的实验室规模半连续进料连续搅拌罐式反应器（CSTR）中研究了油脂和屠宰场废物的共消化。总共对 10 种不同的油脂厂和屠宰场废物进行了特性分析，这些废物的脂质和蛋白质含量较高，甲烷潜能为 262-572 dm(3)CH(4)/kg 挥发性固体（VS）（添加）。在中温 CSTR 中，有机负荷率（OLR）为 1.0 和 1.5 kg VS/m(3)d，水力停留时间（HRT）为 50 d 时，甲烷产率约为 720 dm(3) CH(4)/kg VS(fed)。对于高温过程，研究的最低 OLR 为 1.5 kg VS/m(3)d，在 1.5 HRT 操作后变得不稳定，原因是氨、挥发性脂肪酸（VFAs）和可能还有长链脂肪酸（LCFAs）的积累。总之，与高温过程相比，中温过程更适合共消化，中温条件下甲烷产率更高，过程更稳定。
