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1.
Water Sci Technol ; 52(8): 107-15, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-16312957

RESUMO

The biodegradation kinetics of BTE-oX and MTBE, mixed all together, in the presence of 905 mg/L VSS of BTEX-acclimated biomass was evaluated. Effects of soil and Tergitol NP-10 in aqueous samples on substrate biodegradation rates were also evaluated. Biodegradation kinetics was evaluated for 36 hours, every 6 hours. MTBE biodegradation followed a first-order one-phase kinetic model in all samples, whereas benzene, toluene and ethylbenzene biodegradation followed a first-order two-phase kinetic model in all samples. O-xylene biodegradation followed a first-order two-phase kinetic model in the presence of biomass only. Interestingly, o-xylene biodegradation was able to switch to a first-order one-phase kinetic model when either soil or soil and Tergitol NP-10 were added. The presence of soil in aqueous samples retarded benzene, toluene and ethylbenzene removal rates. O-xylene and MTBE removal rates were enhanced by soil. 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 77-99.8% for benzene, toluene and ethylbenzene. O-xylene and MTBE percent removals ranged 50.1-65.3% and 9.9-43.0%, respectively.


Assuntos
Derivados de Benzeno/metabolismo , Éteres Metílicos/metabolismo , Poloxaleno/metabolismo , Microbiologia do Solo , Poluentes do Solo/metabolismo , Solo/análise , Tensoativos/metabolismo , Biodegradação Ambiental , Cinética , Modelos Teóricos
2.
Water Sci Technol ; 50(5): 85-92, 2004.
Artigo em Inglês | MEDLINE | ID: mdl-15497834

RESUMO

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.


Assuntos
Derivados de Benzeno/metabolismo , Benzeno/metabolismo , Éteres Metílicos/metabolismo , Tolueno/metabolismo , Xilenos/metabolismo , Biodegradação Ambiental , Bioensaio , Biomassa , Biotransformação , Cinética , Modelos Biológicos , Poloxaleno/farmacologia , Microbiologia do Solo , Esterilização , Poluição Química da Água
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