VanderZaag Andrew C, Baldé Hambaliou, Crolla Anna, Gordon Robert J, Ngwabie N Martin, Wagner-Riddle Claudia, Desjardins Ray, MacDonald J Douglas
a Ottawa Research and Development Centre , Agriculture and Agri-Food Canada , Ottawa , Canada.
b Ontario Rural Wastewater Centre , University of Guelph , Alfred , Canada.
Environ Technol. 2018 Apr;39(7):851-858. doi: 10.1080/09593330.2017.1313317. Epub 2017 Apr 26.
The effect of two dairy manure treatments, solid-liquid separation (SLS) and anaerobic digestion (AD), on methane potential and the speed of production was evaluated. Assays were performed in the lab to measure methane (CH) production over 202 d from dairy manure samples taken before and after each treatment. Compared to raw manure, CH emissions on a per-L basis were reduced 81% by SLS and 59% by AD, on average. The mean (SD) ultimate CH emission potential (B) per kg of volatile solids (VS) was 247 (8) L CH kg VS for raw manure, 221 (9) L CH kg VS for separated liquid, and 160 (4) L CH kg VS for anaerobic digestate. Thus, SLS reduced the B of the liquid fraction by 11% and AD reduced B by up to 35% compared to raw manure. Manure treatment affected the speed of CH production: SLS increased the CH production rate and thus separated liquid manure was the fastest to produce 90% of the ultimate CH production. Therefore, both the speed of degradation and B should be considered when assessing these techniques for farm-scale manure storages, because actual emission reductions will depend on storage conditions.
评估了两种奶牛粪便处理方法，即固液分离（SLS）和厌氧消化（AD），对甲烷潜力和产生速度的影响。在实验室进行了试验，以测量在202天内，每次处理前后采集的奶牛粪便样本产生的甲烷（CH）量。与原粪便相比，SLS使每升CH排放量平均降低了81%，AD使其降低了59%。每千克挥发性固体（VS）的平均（标准差）最终CH排放潜力（B），原粪便为247（8）L CH/kg VS，分离出的液体为221（9）L CH/kg VS，厌氧消化产物为160（4）L CH/kg VS。因此，与原粪便相比，SLS使液体部分的B降低了11%，AD使B降低了高达35%。粪便处理影响了CH的产生速度：SLS提高了CH产生率，因此分离出的液体粪便产生最终CH产量的90%的速度最快。因此，在评估农场规模粪便储存的这些技术时，应同时考虑降解速度和B，因为实际减排量将取决于储存条件。
