title: Biodegradation kinetics of BTE-OX and MTBE by a diesel-grown biomass.
abstract: The biodegradation kinetics of BTE-oX and MTBE, mixed all together in the presence of diesel-grown bioaugmented bacterial populations as high as 885 mg/L VSS, was evaluated. The effect of soil in aqueous samples and the effect of Tergitol NP-10 on substrate biodegradation rates were also evaluated. Biodegradation kinetics was evaluated for 54 h, every 6 h. All BTE-oX chemicals followed a first-order two-phase biodegradation kinetic model, whereas MTBE followed a zero-order removal kinetic model in all samples. BTE-oX removal rates were much higher than those of MTBE in all samples. The presence of soil in aqueous samples retarded BTE-oX and MTBE removal rates. The addition of Tergitol NP-10 to aqueous samples containing soil had a positive effect on substrate removal rate in all samples. Substrate percent removals ranged between 64.8-98.9% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged between 18.7-40.8% and 7.2-10.3%, respectively.
authors.affiliation: Laboratorio de Biorremediacion Ambiental, Depto de Microbiologia, Facultad de Medicina, UANL, Madero Pte y Dr Aguirre-Pequeno, Monterrey, NL, Mexico. kaskar@fm.uanl.mx
authors.forename: K
authors.initials: K
authors.lastname: Acuna-Askar
authors.forename: M A
authors.initials: MA
authors.lastname: de la Torre-Torres
authors.forename: M J
authors.initials: MJ
authors.lastname: Guerrero-Munoz
authors.forename: M T
authors.initials: MT
authors.lastname: Garza-Gonzalez
authors.forename: B
authors.initials: B
authors.lastname: Chavez-Gomez
authors.forename: I P
authors.initials: IP
authors.lastname: Rodriguez-Sanchez
authors.forename: H A
authors.initials: HA
authors.lastname: Barrera-Saldana
mesh_terms: D001554:Benzene / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D001711:Biotransformation; D005742:Gasoline; D007700:Kinetics; D008738:Methyl Ethers / Q000032:analysis*; D012989:Soil Pollutants; D013997:Time Factors; D014050:Toluene / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014992:Xylenes / Q000032:analysis*
chemical_list: D001555:Benzene Derivatives; D005742:Gasoline; D008738:Methyl Ethers; D012989:Soil Pollutants; D014992:Xylenes; C043243:methyl tert-butyl ether; D014050:Toluene; D001554:Benzene; C004912:ethylbenzene; C026114:2-xylene