TY - JOUR
T1 - Increased biohydrogen yields, volatile fatty acid production and substrate utilisation rates via the electrodialysis of a continually fed sucrose fermenter
AU - Jones, Rhys Jon
AU - Massanet-Nicolau, Jaime
AU - Mulder, Martijn J J
AU - Premier, Giuliano
AU - Dinsdale, Richard
AU - Guwy, Alan
PY - 2017/4/30
Y1 - 2017/4/30
N2 - Electrodialysis (ED) removed volatile fatty acids (VFAs) from a continually-fed, hydrogen-producing fermenter. Simultaneously, electrochemical removal and adsorption removed gaseous H2 and CO2, respectively. Removing VFAs via ED in this novel process increased H2 yields by a factor of 3.75 from 0.24 mol H2 mol−1 hexose to 0.90 mol H2 mol−1 hexose. VFA production and substrate utilisation rates were consistent with the hypothesis that end product inhibition arrests H2 production. The methodology facilitated the recovery of 37 g of VFAs, and 30 L H2 that was more than 99% pure, both of which are valuable, energy dense chemicals. Typically, short hydraulic and solid retention times, and depressed pH levels are used to suppress methanogenesis, but this limits H2 production. To produce H2 from real world, low grade biomass containing complex carbohydrates, longer hydraulic retention times (HRTs) are required. The proposed system increased H2 yields via increased substrate utilisation over longer HRTs.
AB - Electrodialysis (ED) removed volatile fatty acids (VFAs) from a continually-fed, hydrogen-producing fermenter. Simultaneously, electrochemical removal and adsorption removed gaseous H2 and CO2, respectively. Removing VFAs via ED in this novel process increased H2 yields by a factor of 3.75 from 0.24 mol H2 mol−1 hexose to 0.90 mol H2 mol−1 hexose. VFA production and substrate utilisation rates were consistent with the hypothesis that end product inhibition arrests H2 production. The methodology facilitated the recovery of 37 g of VFAs, and 30 L H2 that was more than 99% pure, both of which are valuable, energy dense chemicals. Typically, short hydraulic and solid retention times, and depressed pH levels are used to suppress methanogenesis, but this limits H2 production. To produce H2 from real world, low grade biomass containing complex carbohydrates, longer hydraulic retention times (HRTs) are required. The proposed system increased H2 yields via increased substrate utilisation over longer HRTs.
KW - Biohydrogen
KW - Electrodialysis
KW - End product inhibition
KW - Homoacetogenesis
KW - Hydraulic retention time
KW - Increased hydrolysis
U2 - 10.1016/j.biortech.2017.01.015
DO - 10.1016/j.biortech.2017.01.015
M3 - Article
C2 - 28107721
AN - SCOPUS:85009821276
VL - 229
SP - 46
EP - 52
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -