DOI: 10.1016/j.watres.2018.08.046
Scopus记录号: 2-s2.0-85053768849
论文题名: Upgrading liquor-making wastewater into medium chain fatty acid: Insights into co-electron donors, key microflora, and energy harvest
作者: Wu Q. ; Guo W. ; Bao X. ; Meng X. ; Yin R. ; Du J. ; Zheng H. ; Feng X. ; Luo H. ; Ren N.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 650
结束页码: 659
语种: 英语
英文关键词: Chain elongation
; Chinese liquor-making wastewater
; Medium chain fatty acid
; Microbial community
; Ruminococcaceae
英文摘要: Ethanol and lactate are considered suitable electron donors (EDs) for chain elongation (CE); however, their respective shortcomings still limit the substrate conversion ratio and medium chain fatty acid (MCFA) production. To address this limitation, different EDs and electron acceptors (EAs) were combined to compare their CE performances, and to investigate whether the combination of ethanol and lactate could further enhance the MCFA production based on the complementary characteristics of ethanol and lactate. The results verified, for the first time, ethanol and lactate as the co-EDs formed a cooperative relationship to largely promote the conversion of substrates into MCFA. The co-EDs of ethanol and lactate stimulated the transformation of dispersive lactate-carbon flux from the competing acrylate pathway into n-heptylate. Additionally, the coexisting by-products (H2 and CO2) from ethanol and lactate also contributed to the supererogatory MCFA generation. The key microbial taxa that distinguished the co-EDs from their single action were the preponderant species from class Negativicutes and family Ruminococcaceae. In addition, the co-EAs of acetate, n-butyrate, and n-caproate also promoted MCFA generation. Low concentration of n-caproate could be directly elongated into n-caprylate, while n-caproate concentration exceeding the toxic limit was unsuitable as an EA. This research provided a guide for substrate selection and collocation for CE technology. Chinese liquor-making wastewater (CLMW) was subsequently used as a substrate for MCFA production since it contains abundant lactate, ethanol, and short-chain fatty acids. In this study, a MCFA selectivity of 80.34 ± 5.26%, a slightly higher selectivity which is in the range of previously reported ones, was obtained. This study paves a way for the sustainable development of Chinese liquor industry by recycling the high-output CLMW into MCFA. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112462
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China; College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, Heilongjiang 161006, China
Recommended Citation:
Wu Q.,Guo W.,Bao X.,et al. Upgrading liquor-making wastewater into medium chain fatty acid: Insights into co-electron donors, key microflora, and energy harvest[J]. Water Research,2018-01-01,145