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- W2058084070 abstract "The influence of ammonia oxidising bacteria and bulk organic competition was assessed during laboratory scale activated sludge treatment. Under short and long hydraulic retention time (HRT) and solid retention time (SRT) conditions, bioreactors were supplied with synthetic sewage spiked with 0.04-2.1 mg m(3) d(-1) of steroid estrogens with and without ammonia as a nitrogen source. Non acclimated biomass that had previously not been exposed to estrogens was capable of biodegrading estrogens (89% and 78%) within 24 h in the short HRT/SRT and long HRT/SRT conditions respectively. Changing the nitrogen source from ammonia to nitrate caused reductions in ammonia oxidising bacteria (AOB) numbers from 2.47×10(8) to 1.17×10(7)AOB mL(-1) and 5.15×10(9) to 4.27×10(7)AOB mL(-1) for the short and long HRT/SRT conditions respectively. Despite these reductions, biodegradation of estrogens was unaffected, which demonstrated that heterotrophic bacteria were able to biodegrade estrogens. Estrogen biodegradation was unrestricted and estrogen could be removed at higher than environmental concentrations following a pseudo-first order relationship. During this study, bulk organic loading appeared not to have any appreciable influence upon estrogen biodegradation. These results suggest heterotrophic bacteria, capable of scavenging a broad spectrum of organic material, carry out estrogen biodegradation." @default.
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- W2058084070 date "2012-11-01" @default.
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- W2058084070 title "Resource dependent biodegradation of estrogens and the role of ammonia oxidising and heterotrophic bacteria" @default.
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- W2058084070 doi "https://doi.org/10.1016/j.jhazmat.2012.06.012" @default.
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