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The objective of this study was to investigate the kinetics of ethyl benzene degradation in the biofilter packed with the isolated bacteria from a petrochemical wastewater treatment plant. The inlet synthetic contaminated air containing 50 ppm ethyl benzene gas was introduced up flow in a 21.2 lite reactor with the flow rate of 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0 L/min. The bacterias were fixed on plastic medias (polyethylene) 40 mm × 40 mm and packed in the reactor with about 30 cm height Both inlet and outlet ethyl benzene concentrations were measured using gas chromatography. The results were fit with the order of reaction equations. The relation between the concentrations and empty bed resident times (EBRT) show that the biofilter kinetics was Zero-Order Reaction Limited Model and The Kinetic constant (k0) was 0.0157 g.m-3min-1. The kinetic of the biodegradation of the biofilter system may be described by an equation: C-C0 = (0.0157×t).
 V. Saravanan, M. Rajasimman, N. Rajamohan, 2010. Biofiltration Kinetics of Ethyl Acetate and Xylene Using Sugarcane Bagasse bases Biofilter. Chemical Engineering Research Bulletin, 14 (2010): 51-57.
 Zarook S., Wasim A., Ahmed A. 2011. Kinetics and Modeling of H2S Removal in a Novel Biofilter. Advances in Chemical Engineering and Science, 1: 72-76.
 Thirawatthana P., Kajana M., Sorn S., Gamgarn T., Paritta R. and Warawut S. Biodegradation of Benzene, Toluene, Ethylbenzene and Xylene (BTEX) by Bacteria Isolate from Petrochemical Waste. At 26th Environmental Technology Conference, Environmental Engineering Association of Thailand, Bangkok, Thailand on 11-12 December 2014.
 Patinya S. A Study of the Bacteria Immobilization on Synthetic Media for using in Biofilter. At 26th Environmental Technology Conference, Environmental Engineering Association of Thailand, Bangkok, Thailand on 11-12 December 2014.