HAMK University of Applied Sciences, P.O. Box 230, 13101 Hämeenlinna, Finland.
J Environ Manage. 2012 Mar;95 Suppl:S122-7. doi: 10.1016/j.jenvman.2011.01.003. Epub 2011 Feb 5.
Biogas quality, the presence of some trace components (siloxanes, sulfur compounds, volatile organic compounds, VOCs) in biogas, is in a decisive role when determining the biogas utilization and the purification requirements and equipments. In the present work, the effects of process changes related to reactor loading variations on the concentrations of selected trace compounds in biogas were studied. Source separated biowaste and sewage sludge were co-digested in a mesophilic pilot reactor (200 L) for four months during which the organic load was stepwise increased. The results showed that the process worked steadily up to the load of 8 kgVS m(-3)d(-1). Also the community composition of methanogenic archae stayed largely unaffected by the load increase, and was at all stages typical for a mesophilic biogasification process. Gaseous concentrations of siloxanes, hydrogen sulfide and most VOCs remained at a constant low level, showing no sensitivity to variations in the load and related process changes. However, the total siloxane concentration in the biogas was dependent on feed quality, and the detected concentrations require removal prior to use in turbines or fuel cells. Otherwise, after the removal of siloxanes, the biogas studied in this work is well applicable in various electricity production options, like in gas engines, turbines, microturbines and fuel cells.
沼气质量，即沼气中存在一些痕量成分（硅氧烷、硫化合物、挥发性有机化合物，VOCs），在决定沼气利用和净化要求及设备方面起着决定性作用。在本工作中，研究了与反应器负荷变化相关的工艺变化对沼气中选定痕量化合物浓度的影响。在四个月的时间里，将分离的生物废物和污水污泥在中温试验性反应堆（200L）中进行共消化，在此期间逐步增加有机负荷。结果表明，该工艺在 8kgVS m(-3)d(-1)的负荷下稳定运行。甲烷菌的群落组成也基本不受负荷增加的影响，在所有阶段都典型地代表了中温沼气化过程。硅氧烷、硫化氢和大多数 VOC 的气态浓度保持在恒定的低水平，对负荷变化及相关工艺变化不敏感。然而，沼气中的总硅氧烷浓度取决于进料质量，并且检测到的浓度在用于涡轮机或燃料电池之前需要去除。否则，在去除硅氧烷后，本工作中研究的沼气可很好地应用于各种发电选择，如在燃气发动机、涡轮机、微型涡轮机和燃料电池中。
