title: Evaluation of biomass production in unleaded gasoline and BTEX-fed batch reactors.
abstract: BTEX removal under aerobic conditions by unleaded gasoline acclimated biomass and BTEX acclimated biomass, and the effect of surfactant on BTEX biodegradation were evaluated. The effect of BTEX concentration as the sole source of carbon for biomass acclimation and the effect of yeast extract on cell growth in unleaded gasoline-fed reactors were also evaluated. For the unleaded gasoline acclimated biomass, benzene was shown the most recalcitrant among all BTEX, followed by o-xylene and toluene with 16-23%, 35-41% and 57-69% biodegradation, respectively. Ethylbenzene was consistently the fastest BTEX chemical removed with 99% biodegradation for the four bioreactor acclimated biomasses tested. For the 1,200 ppm BTEX acclimated biomass, benzene showed the highest removal efficiency (99%) among the four biomass environmental conditions tested, along with 99% toluene and 99% ethylbenzene biodegradation. O-xylene showed 92-94% removal. In all bioassays tested Tergitol NP-10 was fully removed, and did not have a substantial effect on BTEX biodegradation at the end of a 10-day evaluation.
authors.affiliation: Laboratorio de Biorremediacion Ambiental, Facultad de Medicina, Universidad Autonoma de Nuevo Leon, Apdo. Postal 1563, Monterrey, Nuevo Leon, Mexico.
authors.forename: K
authors.initials: K
authors.lastname: Acuna-Askar
authors.forename: A J
authors.initials: AJ
authors.lastname: Englande
authors.forename: A
authors.initials: A
authors.lastname: Ramirez-Medrano
authors.forename: J E
authors.initials: JE
authors.lastname: Coronado-Guardiola
authors.forename: B
authors.initials: B
authors.lastname: Chavez-Gomez
mesh_terms: D001420:Bacteria, Aerobic; D001554:Benzene / Q000302:isolation & purification / Q000378:metabolism; D001555:Benzene Derivatives / Q000302:isolation & purification / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D002273:Carcinogens; D004785:Environmental Pollutants / Q000302:isolation & purification / Q000378:metabolism*; D005742:Gasoline; D014050:Toluene / Q000302:isolation & purification / Q000378:metabolism; D014992:Xylenes / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D001555:Benzene Derivatives; D002273:Carcinogens; D004785:Environmental Pollutants; D005742:Gasoline; D014992:Xylenes; D014050:Toluene; D001554:Benzene; C004912:ethylbenzene