Removal of steroid hormones and personal care products in wastewater by chemical precipitation
DOI:
https://doi.org/10.15626/Eco-Tech.2007.085Nyckelord:
Coagulation; Estrogens; Flocculation ; Oestrogens; Parabens; Powdered activated carbon; Sorption, Xenobiotic organic compounds; YES assay.Abstract
The presence of steroid hormones and endocrine disrupting compounds (EDC) in the
environment has been connected with the drop in semen quality in men and the number of
hem1aphrodite fish observed downstream wastewater treatment plants. EDC originating from
down-the-drain chemicals can be reduced by mitigation options but the naturally occurring
hormones must be removed though end-of-pipe treatment. In this study, coagulation and
flocculation as well as these two techniques combined with sorption were applied to remove
estrone, I 7P-estradiol and the synthetic hormone I7a-ethynylestradiol as well as the
preservatives methyl paraben, ethyl paraben, propyl paraben, butyl paraben and isobutyl
paraben from primary and secondary treated municipal wastewater. It was found that
coagulation with both iron and aluminium together with an anionic flocculant successfully
removed organic matter and dissolved phosphorous but not the hormones and only up to 30%
of the parabens. This was seen both in the chemical analyses of the individual substances and
well as in an assay of the oestrogenic effects. Applications of powdered activated carbon preand post the chemical coagulation-flocculation significantly increased the oestrogen removal,
which is consistent with existing literature. The treatment processes in the studied wastewater
treatment plant removed both the oestrogens and the parabens to below the limit of detection ,
though a detectable but small oestrogenicity in the effluent cannot be disregarded.
Statistik
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Copyright (c) 2007 Eva Eriksson , Heidi Birch, Henrik R. Andersen , Mogens Henze
Det här verket är licensierat under en Creative Commons Erkännande 4.0 Internationell-licens.
