H2 production with anaerobic sludge using activated-carbon supported packed-bed bioreactors |
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Authors: | Lee Kuo-Shing Lo Yung-Sheng Lo Yung-Chung Lin Ping-Jei Chang Jo-Shu |
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Institution: | (1) Department of Chemical Engineering, Feng Chia University, Taichung, Taiwan;(2) Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan |
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Abstract: | Packed-bed bioreactors containing activated carbon as support carrier were used to produce H2 anaerobically from a sucrose-limiting medium while acclimated sewage sludge was used as the H2 producer. The effects of bed porosity ( b) and substrate loading rate on H2 fermentation were examined using packed beds with b of 70–90% being operated at hydraulic retention times (HRT) of 0.5–4 h. Higher b and lower HRT favored H2 production. With 20 g COD l–1 of sucrose in the feed, the optimal H2 production rate (7.4 l h–1 l–1) was obtained when the bed with b=90% was operated at HRT = 0.5 h. Flocculation of cells enhanced the retention of sludge for stable operations of the bioreactor at low HRTs. The gas products resulting from fermentative H2 production consisted of 30–40% H2 and 60–70% CO2. Butyric acid was the primary soluble product, followed by propionic acid and valeric acid. |
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Keywords: | activated carbon flocculated cells H2 production packed-bed bioreactor sewage sludge |
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