Division of Environment and Natural Resources, Norwegian Institute of Bioeconomy Research (NIBIO), 1431 Ås, Norway; Department of Biological and Chemical Engineering, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark.
Department of Biological and Chemical Engineering, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark.
Waste Manag. 2022 Jul 15;149:199-206. doi: 10.1016/j.wasman.2022.06.024. Epub 2022 Jun 22.
Anaerobic digestion of animal slurry to produce biogas is the dominated treatment approach and a storage period is normally applied prior to digestion. Pre-storage, however, contributes to CH emissions and results in loss of biogas potential. Manure management was found to be an efficient approach to reduce not only the on-site CH emission but may also have extended influence on CH emission/losses for storage and subsequent biogas process, while the connection remains unclear. The objective of this study was therefore to evaluate the impact of slurry management (e.g. removal frequency) on CH emission (both on-site and storage process prior to biogas) and biogas yield. An experimental pig house for growing-finishing pigs (30-110 kg) and the relevant CH emission was monitored for one year. In addition, the specific CH activity (SMA) test was conducted and used as an alternative indicator to reflect the impact. Results showed that the manure management affected both on-site and subsequent methane emission; with increased manure removal frequencies, the methane emission became less dependent on variation of temperatures and the specific methanogenesis activity was significantly lower. The highest SMA (100 mL CH gVS), for instance, was observed from the slurries with limited emptied times, which was 10 times of that from the slurries being emptied three times a week. These findings could enlighten the development of environmentally friendly strategies for animal slurry management and biogas production.
动物粪便的厌氧消化生产沼气是主要的处理方法，通常在消化前进行储存。然而，预储存会导致 CH 排放，并导致沼气潜力损失。粪肥管理被发现是一种有效的方法，不仅可以减少现场 CH 排放，而且可能对储存和随后的沼气过程中的 CH 排放/损失产生扩展影响，而这种联系尚不清楚。因此，本研究的目的是评估粪便管理（例如清除频率）对 CH 排放（包括沼气前的现场和储存过程）和沼气产量的影响。一个用于生长育肥猪（30-110 公斤）的实验猪舍及其相关的 CH 排放被监测了一年。此外，还进行了特定 CH 活性（SMA）测试，并用作反映影响的替代指标。结果表明，粪便管理会影响现场和随后的甲烷排放；随着清除粪便的频率增加，甲烷排放对温度变化的依赖性降低，特定甲烷生成活性显著降低。例如，从排空时间有限的粪便中观察到最高的 SMA（100 mL CH gVS），是每周排空三次的粪便的 10 倍。这些发现可以为动物粪便管理和沼气生产的环保策略的制定提供启示。
