Bioconversion of swine manure into high-value products of medium chain fatty acids

文献类型： 外文期刊

第一作者： Zhang, Wanqin

作者： Zhang, Wanqin;Yin, Fubin;Dong, Hongmin;Cao, Qitao;Wang, Shunli;Zhu, Zhiping;Zhang, Wanqin;Yin, Fubin;Dong, Hongmin;Cao, Qitao;Wang, Shunli;Zhu, Zhiping;Xu, Jiajie

作者机构：

关键词： Swine manure; Short chain fatty acids; Medium chain fatty acids; Microbial community; Anaerobic digestion

期刊名称：WASTE MANAGEMENT （ 影响因子：7.145； 五年影响因子：7.907 ）

ISSN： 0956-053X

年卷期： 2020 年 113 卷

页码：

收录情况： SCI

摘要： This research proposes and demonstrates, for the first time, the utilization of swine manure as a complex feedstock to produce high-value medium chain fatty acids (MCFA). The two-stage anaerobic digestion (AD) carboxylates platform was adopted for the conversion of swine manure to short chain fatty acids (SCFAs) and then SCFAs to MCFA (n-caproate, n-heptanoate, and n-caprylate) with ethanol supplementation. We defined the appropriate initial pH of 10.0 for SCFAs production with a carbon conversion rate of 71.2%, and acetate, propionate were the main products, which accounted for around 72.9% of the total SCFAs in the primary stage (I). Through the addition of ethanol, 61.3% of the converted carbon in the complex SCFAs solution was converted into MCFA (C6-C8) in the chain elongation stage (II), while only 6.7% was attributed to methane formation. The concentrations of n-caproate, n-heptanoate, and n-caprylate reached 8.6 g COD/L (3.9 g/L), 6.4 g COD/L (2.7 g/L), and 2.6 g COD/L (1.07 g/L), respectively. This study achieved a relatively higher concentration of n-heptanoate compared with past studies of MCFA from other feedstock. These findings demonstrated a new route for resource recovery and the operating parameters for producing MCFA from swine manure. (C) 2020 Elsevier Ltd. All rights reserved.

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