Medium-chain carboxylates production from co-fermentation of swine manure and corn stalk silage via lactic acid: Without external electron donors

文献类型： 外文期刊

第一作者： Zhang, Wanqin

作者： Zhang, Wanqin;Wang, Shunli;Yin, Fubin;Cao, Qitao;Lian, Tianjing;Zhang, Haiyan;Zhu, Zhiping;Dong, Hongmin;Zhang, Wanqin;Wang, Shunli;Yin, Fubin;Cao, Qitao;Lian, Tianjing;Zhang, Haiyan;Zhu, Zhiping;Dong, Hongmin

作者机构：

关键词： Swine manure; Corn stalk silage; Lactic acid; Medium chain carboxylic acids; Microbial community

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：16.744； 五年影响因子：14.61 ）

ISSN： 1385-8947

年卷期： 2022 年 439 卷

页码：

收录情况： SCI

摘要： Environmental issues caused by untreated animal manure and crop straws require the development of resource recovery from waste through a circular economy approach. Swine manure and corn stalks as the main agricultural biomass can be a renewable resource to produce biofuels and chemicals, and they have been successfully converted into methane via anaerobic digestion. However, the revenue from methane has been relatively low. This study aimed to convert swine manure and corn stalk silage into a high-value medium-chain carboxylic acid (MCCA) through a temperature-phased two-stage bioprocess. The carbohydrates in these streams, which were first converted to lactic acid (LA) rich solution at thermophilic condition, were then fermented to MCCA by mesophilic chain elongation without addition of external e-donors. In this study, thermophilic condition enhanced the LA fermentation and shifted the dominant product spectrum from volatile fatty acid (VFA) to LA. The average LA concentration was 8.4 gCOD/L at thermophilic, which was improved by 3.4 times compared with that achieved at mesophilic condition. For the chain-elongating bioreactor, the LA-rich broth was successfully converted into MCCA. Moreover, the maximum productivities of MCCA and n-caproate were 1890 and 1290 mg COD/L/d, respectively, at pH 6.0 with an LA loading rate of 2.1 g COD/L/d. Maintaining an appropriate LA/VFA ratio and mild pH was necessary to overcome the acrylate pathway and drive LA conversion toward n-caproate instead of propionate. In addition, Pseudoramibacter and Caproiciproducens became the dominant community, with a relative abundance of 45.6% and 9.7%, respectively.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序