DOI: 10.1016/j.jcou.2017.04.014
Scopus记录号: 2-s2.0-85019716495
论文题名: Continuous long-term electricity-driven bioproduction of carboxylates and isopropanol from CO2 with a mixed microbial community
作者: Arends J.B.A. ; Patil S.A. ; Roume H. ; Rabaey K.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 20 起始页码: 141
结束页码: 149
语种: 英语
英文关键词: Acetate
; Biocathode
; CCU
; CO2 utilization
; Isopropanol
; Microbial electrosynthesis
Scopus关键词: Batch data processing
; Batch reactors
; Carboxylation
; Cathodes
; Cyclic voltammetry
; Electrodes
; Microorganisms
; Organic chemicals
; Volatile fatty acids
; Acetate
; Bio-electrochemical reactors
; Biocathodes
; Continuous reactor operation
; Hydraulic residence time
; Iso-propanols
; Microbial community analysis
; Microbial electrosynthesis
; Carbon dioxide
英文摘要: Electricity-driven bioproduction processes such as microbial electrosynthesis enable converting CO2 and organic feedstocks into target chemicals with minimal addition of external chemicals. Bioelectrochemical CO2 conversion to (mainly) acetate has mostly been demonstrated in batch processes. Continuous reactor operation and the operational parameters associated with it have received limited attention. Here, we demonstrate that improving bioelectrochemical reactor design to a higher cathode surface to volume ratio results in an enhanced acetate titer; 5.7 ± 0.74 g L-1 (11.5 ± 6.6 g m-2 d-1) in galvanostastically controlled (-5 A m-2cathode) batch reactors with a mixed microbial community. A long-term and stable bioproduction process could be established in which hydraulic residence time (HRT) affected the product patterns as well as the acetate production rate, up to 21 g m-2 d-1 for an HRT of 3.3d (63% coulombic efficiency) was achieved; the highest reported thus far in a continuous process. The specific energy input per kilogram of acetic acid produced during batch and continuous processes (HRT: 3.3d) was 29 ± 0.7 and 16 ± 1.3 kWhel kg-1, respectively. Butyrate and isopropanol were the other major biochemicals produced at maximum rates of 3.7 and 3.3 g m-2 d-1 (18.6% and 21.8% of the electrons, respectively) leading to titers of 0.67 and 0.82 g L-1 during the continuous process. This is the first report on the production of a secondary alcohol (isopropanol), using a mixed culture, in CO2 fed systems. The product ratios between these organics could be steered based on operational pH and HRTs. Operating reactors at an HRT of 5 d at pH 5 led to stable production of butyrate (1.9 ± 0.6 g m-2 d-1) and isopropanol (1.17 ± 0.34 g m-2 d-1). Cyclic voltammetry suggested an "ennoblement" of the cathode over time, shifting the onset for reductive current by more than 150 mV. Microbial community analysis revealed Acetobacterium as the main bacterial group involved in CO2 reduction to acetate, and the presence of diverse bacterial groups in response to different operational conditions. © 2017 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52708
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Arends J.B.A.,Patil S.A.,Roume H.,et al. Continuous long-term electricity-driven bioproduction of carboxylates and isopropanol from CO2 with a mixed microbial community[J]. Journal of CO2 Utilization,2017-01-01,20