Impact of solid retention time and nitrification capacity on the ability of activated sludge to remove pharmaceuticals

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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@article{d6d18ae0b91f4529aea952086a94c2e6,
title = "Impact of solid retention time and nitrification capacity on the ability of activated sludge to remove pharmaceuticals",
keywords = "Activated sludge, Nitrification, Solid retention time, Pharmaceuticals",
publisher = "Taylor & Francis Ltd.",
author = "Per Falås and Andersen, {Henrik Rasmus} and Anna Ledin and {La Cour Jansen}, Jes",
year = "2012",
doi = "10.1080/09593330.2011.601764",
volume = "33",
number = "8",
pages = "865--872",
journal = "Environmental Technology",
issn = "0959-3330",

}

RIS

TY - JOUR

T1 - Impact of solid retention time and nitrification capacity on the ability of activated sludge to remove pharmaceuticals

A1 - Falås,Per

A1 - Andersen,Henrik Rasmus

A1 - Ledin,Anna

A1 - La Cour Jansen,Jes

AU - Falås,Per

AU - Andersen,Henrik Rasmus

AU - Ledin,Anna

AU - La Cour Jansen,Jes

PB - Taylor & Francis Ltd.

PY - 2012

Y1 - 2012

N2 - Removal of five acidic pharmaceuticals (ibuprofen, ketoprofen, naproxen, diclofenac and clofibric acid) by activated sludge from five municipal activated sludge treatment processes, with various sludge ages and nitrification capacities, was assessed through batch experiments. The increase in aerobic sludge age from 1-3 to 7 days seemed to be critical for the removal of naproxen and ketoprofen, with markedly higher rates of removal at sludge ages of 7 days or more. No removal was shown for diclofenac and clofibric acid, while high rates were observed for ibuprofen in all investigated sludges. Parallel examinations of activated sludge batches with and without allylthiourea (12 mg/L), an inhibitor of ammonia monooxygenase, showed minor to moderate influence on the removal rates of ketoprofen and naproxen. These results suggest that the removal rates of biodegradable pharmaceuticals in municipal activated sludge processes are strongly linked to the heterotrophic bacteria community.

AB - Removal of five acidic pharmaceuticals (ibuprofen, ketoprofen, naproxen, diclofenac and clofibric acid) by activated sludge from five municipal activated sludge treatment processes, with various sludge ages and nitrification capacities, was assessed through batch experiments. The increase in aerobic sludge age from 1-3 to 7 days seemed to be critical for the removal of naproxen and ketoprofen, with markedly higher rates of removal at sludge ages of 7 days or more. No removal was shown for diclofenac and clofibric acid, while high rates were observed for ibuprofen in all investigated sludges. Parallel examinations of activated sludge batches with and without allylthiourea (12 mg/L), an inhibitor of ammonia monooxygenase, showed minor to moderate influence on the removal rates of ketoprofen and naproxen. These results suggest that the removal rates of biodegradable pharmaceuticals in municipal activated sludge processes are strongly linked to the heterotrophic bacteria community.

KW - Activated sludge

KW - Nitrification

KW - Solid retention time

KW - Pharmaceuticals

U2 - 10.1080/09593330.2011.601764

DO - 10.1080/09593330.2011.601764

JO - Environmental Technology

JF - Environmental Technology

SN - 0959-3330

IS - 8

VL - 33

SP - 865

EP - 872

ER -