Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA.
Bioresour Technol. 2022 Mar;347:126656. doi: 10.1016/j.biortech.2021.126656. Epub 2021 Dec 30.
Micro-aeration was proven to be an environmentally friendly strategy for efficiently enhancing volatile fatty acids (VFAs) and lactic acid (LA) production. The roles of micro-aeration on mono-digestion of swine manure (SM) for VFAs production and co-digestion of SM with corn silage (CS) for LA production were investigated, respectively. In this study, micro-aeration increased the maximum VFAs concentration by 20.3% to 35.71 g COD/L, and shortened the time to reach the maximum from 18 days to 10 days. Micro-aeration limited the conversion of LA into VFAs, leading to LA accumulation effectively to be 26.08 g COD/L. Microbial community analysis suggested that Clostridium and Terrisporobacter were always the dominant bacteria with or without micro-aeration for VFAs production, but the relative abundance increased notably during the same period. However, Bifidobacterium, which could use the higher productivity metabolism pathway, i.e., Bifidum pathway to produce LA, increased from lower than 1% to 22.9% by micro-aeration.
微曝气被证明是一种环保的策略，可以有效地提高挥发性脂肪酸（VFAs）和乳酸（LA）的产量。分别研究了微曝气对猪粪（SM）单消化生产 VFAs 和 SM 与玉米青贮（CS）共消化生产 LA 的作用。在这项研究中，微曝气将最大 VFAs 浓度提高了 20.3%至 35.71g COD/L，并将达到最大浓度的时间从 18 天缩短到 10 天。微曝气限制了 LA 转化为 VFAs，从而有效地将 LA 积累到 26.08g COD/L。微生物群落分析表明，无论是否进行微曝气，产 VFAs 时 Clostridium 和 Terrisporobacter 始终是优势细菌，但在同一时期其相对丰度显著增加。然而，微曝气使能够利用更高生产力代谢途径（即双歧杆菌途径）生产 LA 的双歧杆菌从低于 1%增加到 22.9%。
