Mitigation of methane emissions from slurry

In pig farming, methane (CH4) emissions from manure management account for up to 80% of total farmgate greenhouse gases. Methane, a potent greenhouse with 28 times higher global warming potential than carbon dioxide, is a key contributor to climate change. CH4 mitigation strategies include chemical additives to inhibit methanogenic microbial activity in manure which raise additional environmental concerns. Hence, a novel manure treatment driven by the biological conversion of glycerol by Limosilactobacillus reuteri was examined for CH4 mitigation in pig slurry storage. The in-situ production of reuterin, a broad-spectrum antimicrobial agent, was able to reduce CH4 emissions by up to 95% in pig slurries experiments. Ammonia emissions were also reduced. Hence, the microbial conversion of glycerol by L. reuteri holds promise as a biological slurry treatment in agriculture to mitigate climate change.在生猪养殖中，粪便处理环节产生的甲烷（CH4）排放量占猪场自产总温室气体排放量的比例最高可达80%。甲烷是一种强效温室气体，其全球增温潜势为二氧化碳的28倍，是气候变化的关键驱动因子之一。当前主流的甲烷减排策略多采用化学添加剂抑制粪便中产甲烷微生物的活性，但这类手段会带来额外的环境隐患。为此，本研究针对猪粪浆储存过程中的甲烷减排问题，评估了一种由罗伊氏乳杆菌（Limosilactobacillus reuteri）介导甘油生物转化的新型粪便处理方案。实验结果表明，该方案原位生成的罗伊氏菌素（reuterin）作为广谱抗菌剂，在猪粪浆实验中可将甲烷排放量降低最高达95%，同时氨排放量也得到了有效削减。综上，利用罗伊氏乳杆菌（L. reuteri）实现甘油的微生物转化，有望作为农业领域的粪浆生物处理手段，助力气候变化减缓工作。