title: BTE-OX biodegradation kinetics with MTBE through bioaugmentation.
abstract: The biodegradation kinetics of BTE-oX and MTBE, mixed all together, in the presence of bioaugmented bacterial populations as high as 880 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 36 hours, every 6 hours. Benzene and o-xylene biodegradation followed a first-order one-phase kinetic model, whereas toluene and ethylbenzene biodegradation was well described by a first-order two-phase kinetic model in all samples. MTBE followed a zero-order removal kinetic model in all samples. The presence of soil in aqueous samples retarded BTE-oX removal rates, with the highest negative effect on o-xylene. The presence of soil enhanced MTBE removal rate. 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 from 95.4-99.7% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged from 55.9-90.1% and 15.6-30.1%, respectively.
authors.affiliation: Laboratorio de Biorremediacion Ambiental, Facultad de Medicina, UANL, Madero Pte y Dr Aguirre, 64460 Monterrey, NL, Mexico. kaskar@fm.uanl.mx
authors.forename: K
authors.initials: K
authors.lastname: Acuna-Askar
authors.forename: J F
authors.initials: JF
authors.lastname: Villarreal-Chiu
authors.forename: M V
authors.initials: MV
authors.lastname: Gracia-Lozano
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 / Q000378:metabolism*; D001555:Benzene Derivatives / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001681:Biological Assay; D018533:Biomass; D001711:Biotransformation; D007700:Kinetics; D008738:Methyl Ethers / Q000378:metabolism*; D008954:Models, Biological; D011060:Poloxalene / Q000494:pharmacology; D012988:Soil Microbiology; D013242:Sterilization; D014050:Toluene / Q000378:metabolism*; D014877:Water Pollution, Chemical; D014992:Xylenes / Q000378:metabolism*
chemical_list: D001555:Benzene Derivatives; D008738:Methyl Ethers; D014992:Xylenes; C043243:methyl tert-butyl ether; D014050:Toluene; D011060:Poloxalene; D001554:Benzene; C004912:ethylbenzene