PRODUCTION OF SHORT-CHAIN CARBOXYLIC ACIDS BY CO-DIGESTION OF SWINE MANURE AND CORN SILAGE: EFFECT OF CARBON-NITROGEN RATIO

文献类型： 外文期刊

第一作者： Cao, Q.

作者： Cao, Q.;Zhang, W.;Zheng, Y.;Lian, T.;Dong, H.

作者机构：

关键词： Anaerobic digestion; Corn silage; Lactic acid; Short-chain carboxylic acids; Swine manure

期刊名称：TRANSACTIONS OF THE ASABE （ 影响因子：1.188； 五年影响因子：1.695 ）

ISSN： 2151-0032

年卷期： 2020 年 63 卷 2 期

页码：

收录情况： SCI

摘要： Advancing technologies to produce short-chain carboxylic acids (SCCAs) from agricultural waste are expected to be more economical and efficient. This study presented a new attempt to enhance SCCA production from co-digestion of swine manure and corn silage with the carbon-nitrogen (C/N) ratio adjusted from 12.7 to 50.2. Results showed that the maximum SCCA concentration of 26,214 +/- 2948 mg COD L-1 was achieved at a C/N ratio of 25 with 18 days of digestion, and the concentrations of lactic acid (LA) and volatile fatty acids (VFAs) were 8700 +/- 1060 mg COD L-1 and 17,514.+/- 1888 mg COD L-1, respectively. The LA content first increased and then slightly decreased with increasing C/N ratio, and the maximum LA concentration was 468.5 +/- 44.3 mg COD g(-1) VSadded (VSadded means added fermentation material is calculated as volatile solids) at a C/N ratio of 35 at 12 days of digestion. VFAs showed an opposite trend, with a maximum VFA concentration of 601.1 +/- 42.4 mg COD g(-1) VSadded found at a C/N ratio of 12.7 after 12 days of digestion. Potential energy analysis of the highest SCCA production showed that the unit energy value of SCCAs for drop-in fuel production was 50.5% higher than that of methane. Analysis of the microbial community showed that the dominant bacterial groups changed gradually from butyric acid-producing bacteria (Clostridium) to lactic acid-producing bacteria (Lactobacillus) as the C/N ratio increased from 12.7 to 50.2.

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