Revealing mechanism of micro-aeration for enhancing volatile fatty acids production from swine manure

文献类型： 外文期刊

第一作者： Cao, Qitao

作者： Cao, Qitao;Zhang, Wanqin;Lian, Tianjing;Wang, Shunli;Yin, Fubin;Zhou, Tanlong;Wei, Xiaoman;Dong, Hongmin;Lian, Tianjing

作者机构：

关键词： Bio-fermentation; Micro -oxygen environment; Agricultural waste; Acid production; Carbon mass balance; Microbial communities

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.889； 五年影响因子：11.139 ）

ISSN： 0960-8524

年卷期： 2022 年 365 卷

页码：

收录情况： SCI

摘要： Micro-aeration is considered a new strategy for improving volatile fatty acids (VFAs) production of agricultural waste. This study investigated the effect and mechanism of micro-aeration of air and oxygen (O2) on VFAs production from swine manure. The results showed that Air-micro-aeration had the most significant improve-ment effect, with the highest VFAs of 8.21 g/L, which was increased by 22.4%. Moreover, the mixing effects of different micro-aeration were limited, and the microbial communities significantly varied. Firmicutes and Bac-teroidota were the dominant hydrolytic and acidogenic bacteria, and Air-micro-aeration preferentially promoted electron transfer activity and energy generation. Methanosarcina, Methanocorpusculum, and Methanobrevibacter can adapt to environmental changes according to their different oxygen tolerance, and the consumption and conversion of VFAs by methanogens were slow under Air-micro-aeration condition. This study revealed mech-anism of micro-aeration for improving VFAs production from swine manure, providing a theoretical basis for micro-aeration regulation optimization.

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