Biohydrogen production, sludge granulation, and microbial community in an anaerobic inner cycle biohydrogen production (AICHP) reactor at different hydraulic retention times. (26th August 2021)

• Record Type: Journal Article
• Authors: Tang, Taotao; Chen, Ying; Liu, Min; Zhang, Yi; Yu, Zhilong
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 59(2021)
• Page Start: 30300
• Page End: 30309
• Publication Date: 2021-08-26
• Subjects: Biohydrogen production -- Hydraulic retention time -- Granule formation -- Microbial community; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.06.186
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This study investigated the continuous biohydrogen production in an anaerobic inner cycle biohydrogen production (AICHP) reactor fed with synthetic molasses wastewater as the model substrate under mesophilic conditions (37 ± 1 °C). The hydraulic retention times (HRTs) were set as 6.12, 4.90, 4.08, 3.50, and 3.06 h. Both maximum hydrogen production rate (HPR) (8.08 ± 0.48 L/L/d) and maximum granule formation were achieved at the HRT of 3.50 h. Acetic acid and butyric acid were the dominant metabolites in all tested HRTs throughout the experiment. Microbial community analysis showed that shortening the HRT promoted hydrogen production. This was mainly achieved by enhancing the growth of acetogenic bacteria in the AICHP reactor, rather than the growth of hydrogen-producing bacteria. Graphical abstract: Image 1 Highlights: High hydrogen yield and hydrogen production rate obtained at HRT of 3.50 h. Etnterobacteriaceae and Prevotellaceae could promote the formation of HPGS. Accumulation of acetogenic bacteria could promote hydrogen yield in AICHP reactor.