Department of Biological and Chemical Engineering, Aarhus University, 8000-DK Aarhus N, Denmark.
Environ Sci Technol. 2023 Mar 7;57(9):3990-4002. doi: 10.1021/acs.est.2c08891. Epub 2023 Feb 21.
Reducing methane from livestock slurry is one of the quickest ways to counteract global warming. A straightforward strategy is to reduce slurry retention time inside pig houses by frequent transfer to outside storages, where temperature and therefore microbial activity are lower. We demonstrate three frequent slurry removal strategies in pig houses in a year-round continuous measurement campaign. Slurry funnels, slurry trays, and weekly flushing reduced slurry methane emission by 89, 81, and 53%, respectively. Slurry funnels and slurry trays reduced ammonia emission by 25-30%. An extended version of the anaerobic biodegradation model (ABM) was fitted and validated using barn measurements. It was then applied for predicting storage emission and shows that there is a risk of negating barn methane reductions due to increased emission from outside storage. Therefore, we recommend combining the removal strategies with anaerobic digestion pre-storage or storage mitigation technologies such as slurry acidification. However, even without storage mitigation technologies, predicted net methane reduction from pig houses and following outside storage was at least 30% for all slurry removal strategies.
减少牲畜粪污中的甲烷是应对全球变暖的最快方法之一。一种简单直接的策略是通过频繁地将粪污从猪舍转移到外部储存设施，以减少粪污在猪舍中的停留时间，因为外部储存设施的温度较低，微生物活动也较弱。我们在一个全年连续测量的项目中，在猪舍中演示了三种频繁清除粪污的策略。粪污漏斗、粪污托盘和每周冲洗分别减少了 89%、81%和 53%的粪污甲烷排放。粪污漏斗和粪污托盘还减少了 25-30%的氨排放。使用谷仓测量值对扩展后的厌氧生物降解模型（ABM）进行了拟合和验证，并将其应用于预测储存排放。结果表明，由于外部储存的排放增加，有抵消谷仓甲烷减排的风险。因此，我们建议将这些清除策略与厌氧消化预处理或储存缓解技术（如粪污酸化）相结合。然而，即使没有储存缓解技术，对于所有粪污清除策略，猪舍和随后的外部储存的预测净甲烷减排量至少为 30%。
