Fellie E.A.Sannasi P.Wong K.K.Salmijah S.Kader J.2024-05-292024-05-29201297362632-s2.0-84865232220https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865232220&partnerID=40&md5=5254d479b3622b3cb618406544f695abhttps://oarep.usim.edu.my/handle/123456789/10011This investigation reports the tolerance and biodegradation of benzene, toluene, ethylbenzene and xylene isomers (BTEX) by a heavy metal-adapted environmental bacterial consortium, known as consortium culture (CC). Higher tolerance was observed with benzene (IC50 value up to 191.25 mg/L), followed by toluene (IC50 = 139.67 mg/L), xylene (IC50 = 97.04 mg/L) and ethylbenzene (IC50 =96.99 mg/L). Significant decrease (p < 0.05) in the specific growth rate (?), however was observed as the concentrations of each individual BTEX were increased from 10 mg/L to 500 mg/L. Growth of CC was completely inhibited at 250 mg/L ethylbenzene and 500 mg/L xylene. Toxicity followed the trend: B<T<X<E. Biodegradation of individual BTEX compound was monitored by gas chromatography. The GC-FID chromatographic profiles showed the capability of CC to significantly biodegrade (p < 0.05) benzene (61.66%), toluene (55.91%), ethylbenzene (37.15%), p-xylene (43.66%), m-xylene (47.86%) and o-xylene (41.03%) at an initial concentration of 50 mg/L after 48 hours. These findings confirm the ability of CC to withstand biodegrade and utilize BTEX as the sole source of carbon and energy in the following order: B>T>X>E.en-USBacteriaBiodegradationBioreme-diationBTEXBTEX toleranceArticle525873