Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of Agriculture and Rural Affairs, Beijing 100081, China.
Bioresour Technol. 2022 Sep;359:127449. doi: 10.1016/j.biortech.2022.127449. Epub 2022 Jun 10.
Anaerobic co-fermentation (AcoF) of dairy cattle manure (DCM) and corn straw silage (CSS) for producing lactic acid (LA) and volatile fatty acids (VFAs) was investigated. Batch experiments were conducted at seven different DCM/CSS ratios and at mesophilic and thermophilic temperatures. Results indicated that the highest concentration of LA was 17.50 ± 0.70 g/L at DCM:CSS ratio of 1:3 and thermophilic temperature, while VFAs was 18.23 ± 2.45 g/L at mono-CSS fermentation and mesophilic temperature. High solubilization of thermophilic conditions contributed to LA accumulation in AcoF process. Presence of the CSS increased the relative abundance of Lactobacillus for LA production at thermophilic. Meanwhile, the abundance of Bifidobacterium was increased when CSS was added at mesophilic, which could conduce to VFAs production. This study provides a new route for enhancing the biotransformation of DCM and CSS into short-chain fatty acids, potentially bringing economic benefits to agricultural waste treatment.
本研究考察了奶牛粪便（DCM）和玉米秸秆青贮（CSS）的厌氧共发酵（AcoF）生产乳酸（LA）和挥发性脂肪酸（VFAs）的情况。在七种不同的 DCM/CSS 比例和中温和高温条件下进行了分批实验。结果表明，在 DCM:CSS 比例为 1:3 和高温条件下，LA 的最高浓度为 17.50±0.70g/L，而在单 CSS 发酵和中温条件下，VFAs 的浓度为 18.23±2.45g/L。高温条件下的高溶解性能有助于 AcoF 过程中 LA 的积累。CSS 的存在增加了高温条件下 LA 生产的乳杆菌相对丰度。同时，在中温条件下添加 CSS 时，双歧杆菌的丰度增加，这有助于 VFAs 的生产。本研究为提高 DCM 和 CSS 向短链脂肪酸的生物转化提供了新途径，可能为农业废物处理带来经济效益。
