TY - JOUR
T1 - Enhanced selectivity to butyrate and caproate above acetate in continuous bioelectrochemical chain elongation from CO2: Steering with CO2 loading rate and hydraulic retention time
AU - Jourdin, Ludovic
AU - Winkelhorst, Marijn
AU - Rawls, Brian
AU - Buisman, Cees J.N.
AU - Strik, David P.B.T.B.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - The selective and high-rate microbial electrosynthesis of a valuable molecule is favoured from an economic perspective. We demonstrate here that increasing selectivity towards n-butyrate and n-caproate over acetate, while maintaining high production rate and electron recovery, is achievable by adjusting the CO2 feeding strategy and hydraulic retention time. We show that high CO2 loading rate (173 L d− 1) and long hydraulic retention time (14 days) triggers bioelectrochemical chain elongation to n-butyrate and n-caproate (53.6 ± 4.1%C), whereas lower CO2 loading rate (8.6 L d− 1) does not, even with increasing HRT (96.4 ± 2.4%C into acetate). Moreover, temporarily detaching and re-attaching the biofilm allowed to obtain high-rate n-caproate production of 2.0 ± 0.1 g L− 1 d− 1 (max 3.1 g L− 1), while producing 3.3 ± 0.2 g L− 1 d− 1 n-butyrate (max 9.3 g L− 1), at an increased 63.6 ± 5.0%C into both. This was achieved with 69.8 ± 2.8% total electron recovery at −100.8 A m− 2.
AB - The selective and high-rate microbial electrosynthesis of a valuable molecule is favoured from an economic perspective. We demonstrate here that increasing selectivity towards n-butyrate and n-caproate over acetate, while maintaining high production rate and electron recovery, is achievable by adjusting the CO2 feeding strategy and hydraulic retention time. We show that high CO2 loading rate (173 L d− 1) and long hydraulic retention time (14 days) triggers bioelectrochemical chain elongation to n-butyrate and n-caproate (53.6 ± 4.1%C), whereas lower CO2 loading rate (8.6 L d− 1) does not, even with increasing HRT (96.4 ± 2.4%C into acetate). Moreover, temporarily detaching and re-attaching the biofilm allowed to obtain high-rate n-caproate production of 2.0 ± 0.1 g L− 1 d− 1 (max 3.1 g L− 1), while producing 3.3 ± 0.2 g L− 1 d− 1 n-butyrate (max 9.3 g L− 1), at an increased 63.6 ± 5.0%C into both. This was achieved with 69.8 ± 2.8% total electron recovery at −100.8 A m− 2.
KW - Bioelectrochemical chain elongation
KW - Caproate
KW - Carbon dioxide utilization
KW - Microbial electrosynthesis
KW - Selectivity
U2 - 10.1016/j.biteb.2019.100284
DO - 10.1016/j.biteb.2019.100284
M3 - Article
AN - SCOPUS:85073007517
SN - 2589-014X
VL - 7
JO - Bioresource Technology Reports
JF - Bioresource Technology Reports
M1 - 100284
ER -