Fermentative bioenergy production from distillers grains using mixed microflora |
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| Authors: | Yeong-Song Chuang Chih-Yu Huang Chyi-How Lay Chin-Chao Chen Biswarup Sen Chiu-Yue Lin |
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| Affiliation: | 1. Department of Environmental Engineering and Science, Feng Chia University, Taichung 40724, Taiwan;2. Green Energy Development Center, Feng Chia University, Taichung 40724, Taiwan;3. Master’s Program of Green Energy Science and Technology, Feng Chia University, Taichung 40724, Taiwan;4. Environmental Resources Laboratory, Department of Landscape Architecture, Chungchou University of Science and Technology, Changhwa 51022, Taiwan |
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| Abstract: | The feasibility of hydrogen production from distillers grains substrate, an industrial cellulosic waste, was investigated. A substrate concentration of 80 g/L gave the maximum production at 50 °C and pH of 6.0 using sewage sludge. Four controllable factors with three levels: seed sludge (two sewage sludges and cow dung), temperature (40, 50, and 60 °C), pH (6, 7 and 8) and seed pretreatment (none, heat, and acid) were selected in Taguchi experimental design to optimize fermentation conditions. The peak hydrogen and ethanol productions were found with heat-treated cow dung seed, substrate concentration 80 g/L, 50 °C and pH 6. The peak hydrogen production rate and hydrogen yield were 7.9 mmol H2/L/d and 0.40 mmol H2/g-COD respectively whereas the peak ethanol production was 3050 mg COD/L and rate 0.22 g EtOH/L/d. A total bioenergy yield of 41 J/g substrate was obtained which was 21% and 79% from hydrogen and ethanol respectively. |
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| Keywords: | Anaerobic fermentation Biohydrogen Cellulose Ethanol Taguchi experimental design Distillers grains |
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