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Feasibility of hydrogen production from ripened fruits by a combined two-stage (dark/dark) fermentation system |
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| Authors: | Jae-Hoon HwangJeong-A Choi Reda AI Abou-Shanab Booki MinHocheol Song Yongje Kim Eung Seok LeeByong-Hun Jeon |
| Institution: | a Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-Do 220-710, South Korea b Department of Environmental Biotechnology, Mubarak City for Scientific Research, Alexandria, Egypt c Department of Environmental Science and Engineering, Kyung Hee University, Yongin-Si, Gyeonggi-Do 446-701, South Korea d Geologic Environment Division, KIGAM, Daejeon 305-350, South Korea e Geological Sciences, College of Arts and Sciences, Ohio University, Athens, OH 45701-2979, USA |
| Abstract: | Anaerobic fermentation for hydrogen (H2) production was studied in a two-stage fermentation system fed with different ripened fruit feedstocks (apple, pear, and grape). Among the feedstocks, ripened apple was the most efficient substrate for cumulative H2 production (4463.7 mL-H2 L−1-culture) with a maximum H2 yield (2.2 mol H2 mol−1 glucose) in the first stage at a hydraulic retention time (HRT) of 18 h. The additional cumulative biohydrogen (3337.4 mL-H2 L−1-culture) was produced in the second stage with the reused residual substrate from the first stage. The major byproducts in this study were butyrate, acetate, and ethanol, and butyrate was dominant among them in all test runs. During the two-stage system, the energy efficiency (H2 conversion) obtained from mixed ripened fruits (RF) increased from 4.6% (in the first stage) to 15.5% (in the second stage), which indicated the energy efficiency can be improved by combined hydrogen production process. The RF could be used as substrates for biohydrogen fermentation in a two-stage (dark/dark) fermentation system. |
| Keywords: | Biohydrogen Two-stage fermentation Energy efficiency Ripened fruits Hydraulic retention time |
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