title: Biodegradation of Triton X-100 and its primary metabolites by a bacterial community isolated from activated sludge.
abstract: A set of studies was carried using a continuous flow biodegradation unit in order to isolate a microbial community capable of efficient and complete utilization of octylphenol ethoxylates from activated sludge. Increasing concentrations of Triton X-100 (in the range of 1-1000 mg/l) were applied over a time period of 35 days in order to select microorganisms, which exhibit high tolerance towards this surfactant. The fate of the surfactant and its primary degradation products was assessed by HPLC/MS. It was observed that even small doses of the surfactant contributed to the disruption of the activated sludge, due to adsorption of primary Triton X-100 metabolites (octylphenol and short-chained ethoxylates) on the cells, although the long-chain octylphenol ethoxylates were efficiently degraded during the isolation process. The toxicity assessment of octylphenol as well as octylphenol di- and monoethoxylates towards activated sludge allowed for determination of EC50 values (8 and 55 mg/l, respectively). The identification of the residual microorganisms revealed the presence of Acinetobacter junii, Acinetobacter calcoaceticus, Aeromonas hydrophilia, Alcaligenes spp., Pseudomonas fluorescens and Sphingomonas capsulata. The isolated community exhibited a high resistance towards Triton X-100 and was capable of growth even at 10,000 mg/l, with the highest specific growth rate (0.47 h(-1)) observed at 4000 mg/l. Under aerobic conditions both octylphenol and the short-chained ethoxylates were completely degraded while no toxic effect towards the isolated bacterial community was observed.
authors.affiliation: Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Wyrwas
authors.forename: Zbysław
authors.initials: Z
authors.lastname: Dymaczewski
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Zgoła-Grześkowiak
authors.forename: Andrzej
authors.initials: A
authors.lastname: Szymański
authors.forename: Magdalena
authors.initials: M
authors.lastname: Frańska
authors.forename: Izabela
authors.initials: I
authors.lastname: Kruszelnicka
authors.forename: Dobrochna
authors.initials: D
authors.lastname: Ginter-Kramarczyk
authors.forename: Paweł
authors.initials: P
authors.lastname: Cyplik
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Ławniczak
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Chrzanowski
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D018533:Biomass; D002851:Chromatography, High Pressure Liquid; D059013:Microbial Consortia; D017830:Octoxynol / Q000378:metabolism* / Q000633:toxicity; D010636:Phenols / Q000378:metabolism; D012336:RNA, Ribosomal, 16S; D012722:Sewage / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000378:metabolism
chemical_list: D010636:Phenols; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D014874:Water Pollutants, Chemical; C474055:octylphenol; D017830:Octoxynol
keywords: Activated sludge; Bacterial community; Biodegradation; Octylphenol; Triton X-100