Acuna-Askar K, Englande A J, Ramirez-Medrano A, Coronado-Guardiola J E, Chavez-Gomez B
Laboratorio de Biorremediacion Ambiental, Facultad de Medicina, Universidad Autonoma de Nuevo Leon, Apdo. Postal 1563, Monterrey, Nuevo Leon, Mexico.
Water Sci Technol. 2003;48(8):127-33.
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.
评估了由无铅汽油驯化生物量和BTEX驯化生物量在有氧条件下去除BTEX的情况，以及表面活性剂对BTEX生物降解的影响。还评估了BTEX浓度作为生物量驯化唯一碳源的影响以及酵母提取物对无铅汽油进料反应器中细胞生长的影响。对于无铅汽油驯化生物量，苯在所有BTEX中最难降解，其次是邻二甲苯和甲苯，其生物降解率分别为16 - 23%、35 - 41%和57 - 69%。在所测试的四个生物反应器驯化生物量中，乙苯始终是去除最快的BTEX化学品，生物降解率为99%。对于1200 ppm BTEX驯化生物量，在测试的四种生物量环境条件中，苯的去除效率最高（99%），甲苯和乙苯的生物降解率也为99%。邻二甲苯的去除率为92 - 94%。在所有测试的生物测定中，壬基酚聚氧乙烯醚（Tergitol NP - 10）被完全去除，并且在10天评估结束时对BTEX生物降解没有实质性影响。
