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Improving production of lactic acid and volatile fatty acids from dairy cattle manure and corn straw silage: Effects of mixing ratios and temperature
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-10 , DOI: 10.1016/j.biortech.2022.127449
Tianjing Lian 1 , Wanqin Zhang 2 , Qitao Cao 3 , Shunli Wang 2 , Hongmin Dong 2 , Fubin Yin 2
Affiliation  

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 for LA production at thermophilic. Meanwhile, the abundance of 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.

中文翻译:


提高奶牛粪便和玉米秸秆青贮饲料中乳酸和挥发性脂肪酸的产量:混合比例和温度的影响



研究了奶牛粪便(DCM)和玉米秸秆青贮饲料(CSS)的厌氧共发酵(AcoF)生产乳酸(LA)和挥发性脂肪酸(VFA)。在七种不同的 DCM/CSS 比例以及嗜温和嗜热温度下进行批量实验。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±0.70 g/L,而在单CSS发酵和中温温度下,VFA的最高浓度为18.23±2.45 g/L。高温条件的高溶解度有助于 AcoF 过程中 LA 的积累。 CSS 的存在增加了嗜热条件下 LA 生产的相对丰度。同时,在中温添加CSS时,丰度增加,有利于VFA的产生。这项研究为增强DCM和CSS生物转化为短链脂肪酸提供了一条新途径,可能为农业废物处理带来经济效益。
更新日期:2022-06-10
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