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De-conjugation Fate of the Conjugated Estrogens in the Raw Wastewater

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This paper describes the behavior, occurrence and de-conjugation rate of the conjugated estrogens in raw wastewater. De-conjugation of sulphate and glucuronide conjugates in raw wastewater was investigated in batch experiments (flasks shake). The experiments were carried out at 2.5 μg/L initial concentration. Both conjugates were transformed into their free estrogen forms with different rate constants. The first order rate constants for estrone-3-sulphate (E1-3S), estradiol-3-sulphate (E2-3S), estrone-3-glucuronide (E1-3G), estradiol-3-glucuronide (E2-3G), estrone (E1) and 17β-estradiol (E2) at 22±2°C were found to be 0.06, 0.05, 1.94, 1.92, 0.10 and 0.34/h respectively, indicating that the sulphate conjugates were more stable to de-conjugation rather than the glucuronide conjugates. Further, the occurrence of studied conjugated estrogens was evaluated in influent and effluent wastewater of four wastewater treatment plants (WWTPs) located in Shiga prefecture, Japan. E2-3S was detected at the highest concentrations in influent sample ranging from 61.5 to 97.4 ng/L, and up to 1.3 ng/L in effluent samples. Glucuronide conjugates were below than detection limit in influent and effluent samples, however.
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Keywords: Conjugated estrogens; activated sludge process; batch experiment; de-conjugation

Document Type: Research Article

Publication date: 2009-01-01

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