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.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Wyrwas B,Dymaczewski Z,Zgoła-Grześkowiak A,Szymański A,Frańska M,Kruszelnicka I,Ginter-Kramarczyk D,Cyplik P,Ławniczak Ł,Chrzanowski Łdoi
10.1016/j.jenvman.2013.05.028subject
Has Abstractpub_date
2013-10-15 00:00:00pages
292-9eissn
0301-4797issn
1095-8630pii
S0301-4797(13)00356-3journal_volume
128pub_type
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