TY - JOUR
T1 - Resistance assessment of microbial electrosynthesis for biochemical production to changes in delivery methods and CO2 flow rates
AU - Bian, Bin
AU - Xu, Jiajie
AU - Katuri, Krishna
AU - Saikaly, Pascal
N1 - KAUST Repository Item: Exported on 2020-10-12
Acknowledged KAUST grant number(s): URF/1/2985-01-01
Acknowledgements: This work was supported by Competitive Research Grant (URF/1/2985-01-01) from King Abdullah University of Science and Technology (KAUST).
PY - 2020/9/28
Y1 - 2020/9/28
N2 - Microbial electrosynthesis (MES) for CO2 valorization could be influenced by fluctuations in CO2 mass transfer and flow rates. In this study, we developed an efficient method for CO2 delivery to cathodic biofilm by directly sparging CO2 through the pores of ceramic hollow fiber wrapped with Ni-foam/carbon nanotube electrode, and obtained 45% and 77% higher acetate and methane production, respectively. This was followed by the MES stability test in response to fluctuations in CO2 flow rates varying from 0.3 ml/min to 10 ml/min. The biochemical production exhibited an increasing trend with CO2 flow rates, achieving higher acetate (47.0 ± 18.4 mmol/m2/day) and methane (240.0 ± 32.2 mmol/m2/day) generation at 10 ml/min with over 90% coulombic efficiency. The biofilm and suspended biomass, however, showed high resistance to CO2 flow fluctuations with Methanobacterium and Acetobacterium accounting for 80% of the total microbial community, which suggests the robustness of MES for onsite carbon conversion.
AB - Microbial electrosynthesis (MES) for CO2 valorization could be influenced by fluctuations in CO2 mass transfer and flow rates. In this study, we developed an efficient method for CO2 delivery to cathodic biofilm by directly sparging CO2 through the pores of ceramic hollow fiber wrapped with Ni-foam/carbon nanotube electrode, and obtained 45% and 77% higher acetate and methane production, respectively. This was followed by the MES stability test in response to fluctuations in CO2 flow rates varying from 0.3 ml/min to 10 ml/min. The biochemical production exhibited an increasing trend with CO2 flow rates, achieving higher acetate (47.0 ± 18.4 mmol/m2/day) and methane (240.0 ± 32.2 mmol/m2/day) generation at 10 ml/min with over 90% coulombic efficiency. The biofilm and suspended biomass, however, showed high resistance to CO2 flow fluctuations with Methanobacterium and Acetobacterium accounting for 80% of the total microbial community, which suggests the robustness of MES for onsite carbon conversion.
UR - http://hdl.handle.net/10754/665516
UR - https://linkinghub.elsevier.com/retrieve/pii/S0960852420314516
UR - http://www.scopus.com/inward/record.url?scp=85091952718&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2020.124177
DO - 10.1016/j.biortech.2020.124177
M3 - Article
C2 - 33035863
SN - 1873-2976
VL - 319
SP - 124177
JO - Bioresource Technology
JF - Bioresource Technology
ER -