Effect of headspace carbon dioxide sequestration on microbial biohydrogen communities. (24th August 2015)

• Record Type: Journal Article
• Authors: Nasr, Noha; Velayutham, Preethi; Elbeshbishy, Elsayed; Nakhla, George; El Naggar, M. Hesham; Khafipour, Ehsan; Derakhshani, Hooman; Levin, David B.; Hafez, Hisham
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 32(2015)
• Page Start: 9966
• Page End: 9976
• Publication Date: 2015-08-24
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.06.077
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">This study investigated the impact of CO₂ removal from the headspace of a continuous flow biohydrogen production system on the H₂ yield and microbial community structure. A comparative study was conducted in the Integrated Biohydrogen Reactor Clarifier System (IBRCS) with and without potassium hydroxide in the reactor headspace to sequester CO₂ using glucose. Headspace CO₂ sequestration increased the H₂ yield by 22% to 2.96 ± 0.14 mol/mol_hexose. The impact of headspace CO₂ sequestration was not limited to the improvement in H₂ yield and gas quality, as it also influenced the metabolic pathway increasing acetate concentration, and decreasing butyrate and propionate concentrations. Detailed analyses of the microbial community structure in the IBRCS before and after CO₂ sequestration revealed that removal of CO₂ from the headspace of the bioreactor had a significant impact on the microbial diversity and species distribution which rationalize the observed changes in the metabolic pathways.</p> </sec> </abstract>