Cell Immobilized FOG-Trap System for Fat, Oil, and Grease Removal from Restaurant Wastewater
Publication: Journal of Environmental Engineering
Volume 135, Issue 9
Abstract
Cell immobilized lipase-producing bacteria on three different matrices were incorporated in a fat-, oil-, and grease (FOG) trap system for restaurant wastewater treatment. During a 16-day laboratory-scale experiment for the treatment of synthetic FOG wastewater containing soybean oil, no significant difference (two-tailed test at 95% confidence interval) in the FOG removal between two systems was observed at FOG influent . However, the typical trap showed lower FOG removal efficiency than the matrix-based system when the influent FOG concentration was increased to . In addition, the matrix-based trap system was able to sustain a stable high FOG removal, with effluent, even at 10,000 mg/L influent FOG. Based on FOG heights measured and mass balance calculations, 97.4 and 99.5% of the total FOG load for 16 days were removed in a typical trap and matrix-based system, respectively. About 93.6% of the removal in the matrix-based was accounted to biodegradation. The 30-day full-scale operations demonstrated a distinguishably better performance in the matrix-based system ( of FOG/L) than in the typical trap system ( of FOG/L) for the treatment of barbeque restaurant wastewater. Similarly, matrix-based system revealed higher chemical oxygen demand removal than the typical trap system . Characterizations of the influent, emulsified, adsorbed and effluent FOG indicated that straight saturated fatty acids constituted the cause of clogging problems in the FOG-trap and piping system.
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Acknowledgments
This research was funded by Biogreen 21, Rural Development Administration, Republic of Korea (2002), Project No. 20050401-034-750-142-01-00. Grace Nisola and Eulsaeng Cho contributed equally to this paper.
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© 2009 ASCE.
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Received: Jan 29, 2007
Accepted: Mar 26, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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