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Degradation of Free Estrogens and their Conjugates in Wastewater Treatment Process

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This paper describes degradation characteristics of free estrogens and their conjugates in simulated membrane bioreactor (MBR). Hydraulic retention time (HRT) of aerobic section was set at 8 hours and aerobic solids retention time (A-SRT) was set at 60 days. Target substances were 17β-estradiol (E2), estrone (E1), 17α-ethynylestradiol (EE2), estriol (E3), estrone-3-sulfate (E1-S), β-estradiol 3-sulfate (E2-S), estriol 3-sulfate (E3-S), estradiol-3, 17-disulfate (E2-diS). Concentrations of target substances in influent and effluent were determined by LC/MS/MS. Concentrations of free estrogens were completely declined in aerobic wastewater treatment process, while estrogen conjugates remained in the effluent. Moreover we found that E1-S, E2-S and E3-S were degraded to some extent, while E2-diS was rather stable in the aerobic wastewater treatment process.

Document Type: Research Article


Publication date: 2005-01-01

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