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The aerobic degradation of the natural hormone 17-β-estradiol (E2) and the synthetic hormone 17-α-ethinyl estradiol (EE2) was investigated in batch experiments with activated sludge from a conventional and a membrane sewage treatment plant. E2 was converted to estrone (E1), the well known metabolite, and further completely transformed within 3 days. The turnover rates of E2 did not differ greatly...
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