Optimization of batch dilute-acid hydrolysis for biohydrogen production from red algal biomass |
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Authors: | Jeong-Hoon Park Hyo-Chang Cheon Jeong-Jun Yoon Hee-Deung Park Sang-Hyoun Kim |
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Affiliation: | 1. Department of Civil, Environmental and Architectural Engineering, Korea University, Anam-Dong, Seongbuk-gu, Seoul 136-714, Republic of Korea;2. Green Materials Technology Center, Korea Institute of Industrial Technology (KITECH), 35-3 Hongcheon-ri, Ipjang-myeon, Cheonan, Chungnam 330-825, Republic of Korea;3. Department of Environmental Engineering, Daegu University, Jillyang, Gyeongsan, Gyeongbuk 712-714, Republic of Korea |
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Abstract: | Marine algae are promising alternative sources for bioenergy including hydrogen. Their polymeric structure, however, requires a pretreatment such as dilute-acid hydrolysis prior to fermentation. This study aimed to optimize the control variables of batch dilute-acid hydrolysis for dark hydrogen fermentation of algal biomass. The powder of Gelidium amansii was hydrolyzed at temperatures of 120–180 °C, solid/liquid (S/L) ratios of 5–15% (w/v), and H2SO4 concentrations of 0.5–1.5% (w/w), and then fed to batch hydrogen fermentation. Among the three control variables, hydrolysis temperature was the most significant for hydrogen production as well as for hydrolysis efficiency. The maximum hydrogen production performance of 0.51 L H2/L/hr and 37.0 mL H2/g dry biomass was found at 161–164 °C hydrolysis temperature, 12.7–14.1% S/L ratio, and 0.50% H2SO4. The optimized dilute-acid hydrolysis would enhance the feasibility of the red algal biomass as a suitable substrate for hydrogen fermentation. |
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Keywords: | Marine algal biomass Dilute-acid hydrolysis Dark hydrogen fermentation Hydrolysis temperature Sulfuric acid concentration Solid/liquid ratio (S/L ratio) |
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