Energy yields from anaerobic digestion of palm oil mill effluent |
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| Institution: | 1. Department of Civil Engineering, National University of Singapore, Singapore 0511;2. Department of Environmental Science, Universiti Pertanian Malaysia, Serdang, Malaysia;1. Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran;2. Department of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran;1. Standards Development Branch, Ontario Ministry of the Environment and Climate Change,40 St. Clair Ave. West, Toronto, ON, M4 V 1T2, Canada;2. Civil and Environmental Engineering, University of Waterloo, 250 University Ave., Waterloo, ON, N2L 3G1, Canada;1. RL-Microbial Ecology and Technology, INSAT, University of Carthage, Earth street, PB-676, 1080 Tunis, Tunisia;2. Département de Génie Biologique et Chimique, Institut National des Sciences Appliquées et de Technologie, Université de Carthage, Boulevard de la terre, BP-676, 1080 Tunis, Tunisia |
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| Abstract: | Three different suspended-growth anaerobic digestion configurations—the mesophilic one-stage, the mesophilic two-phase and the thermophilic one-stage, were used to treat palm oil mill effluent (POME) and their performances compared. The mesophilic two-phase process showed the highest energy yields which reached 20 542 J g?1 COD utilized at a hydraulic retention time of 31 days. However, high energy yields did not coincide with high TCOD removals. The latter was a characteristic of the thermophilic process. The relatively poor TCOD removal in the two-phase system was due to its lower efficiency in VSS removal. At hydraulic retention times of 25 days and more the mesophilic one-stage process had higher energy yields than the thermophilic process. Anaerobic digestion was found to be an effective means for POME treatment. |
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