title: Removal of pyrene and benzo(a)pyrene from contaminated water by sequential and simultaneous ozonation and biotreatment.
abstract: The removal of pyrene and benzo(a)pyrene from contaminated water by sequential and simultaneous ozonation-bioremediation techniques was investigated. During the sequential treatment, ozonation using 0.5 or 2.5 mg/L ozone was used as a pretreatment process, whereas, during the simultaneous treatment process, ozonation of hydrocarbon-contaminated water at a predetermined duration using 0.5 mg/L ozone was made in the presence of microbial biomass. Ozonation was not beneficial for the removal of pyrene. However, despite a decreased specific biodegradation rate, ozonation improved the overall elimination of benzo(a)pyrene during both treatment processes. The overall removal of benzo(a)pyrene increased from 23 to 91% after exposure of the water to 0.5 mg/L ozone for 30 minutes during the simultaneous treatment process and further to 100% following exposure to 2.5 mg/L ozone for 60 minutes during the sequential treatment mode, demonstrating the benefits of combined ozonation-biological treatment for the removal of polycyclic aromatic hydrocarbons.
authors.affiliation: Biotechnology Research Institute, National Research Council Canada, Montreal.
authors.forename: Laleh
authors.initials: L
authors.lastname: Yerushalmi
authors.forename: Sabria
authors.initials: S
authors.lastname: Nefil
authors.forename: Robert
authors.initials: R
authors.lastname: Hausler
authors.forename: Serge R
authors.initials: SR
authors.lastname: Guiot
mesh_terms: D001564:Benzo(a)pyrene / Q000032:analysis / Q000302:isolation & purification*; D001673:Biodegradation, Environmental; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000302:isolation & purification; D011721:Pyrenes / Q000032:analysis / Q000302:isolation & purification*; D015203:Reproducibility of Results; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D014874:Water Pollutants, Chemical; D001564:Benzo(a)pyrene; C030984:pyrene