Occurrence and removal of selected micropollutants in a water treatment plant.

Abstract:

:The levels of 14 micropollutants including nine pharmaceuticals, two pesticides, and three endocrine disruptors were measured in a water treatment plant (WTP) in Seoul, Korea. Among the measured micropollutants, 12 (excluding atrazine and triclocarban) were found in the influent and effluent from the WTP, at levels ranging from 2 to 482 ng L(-1). The removal efficiencies of the detected micropollutants in the WTP ranged from 6% to 100%. Among them diclofenac, acetaminophen, caffeine, carbamazepine, and 2,4-D were effectively removed (>80%). Metoprolol was unlikely to be removed (6%) in the WTP process. Concentrations of acetaminophen, metoprolol, ibuprofen, and naproxen were higher in winter, while levels of herbicides of 2,4-dichloro-phenoxyacetic acid (2,4-D) were higher in summer. Metoprolol was hardly removed in the water treatment process. Laboratory experiments showed that compounds with logKow>2.5 (especially bisphenol-A, 2,4-D, carbamazepine, triclocarban and 4-nonylphenol) were effectively removed by coagulation process, and adsorption effect increased in proportion with hydrophobicity of micropollutants and the turbidity of water. Sunlight photodegradation also effectively removed sulfamethoxazole, sulfamethazine, caffeine, diclofenac, ibuprofen, and acetaminophen, which are photosensitizes. Chlorination was relatively not effective for the removal of micropollutants due to the lower chlorine dosage (2 mg L(-1)), lower contact time (1h), and already lower levels of micropollutants at the chlorination stage at WTP. Our results imply that micropollutants during coagulation stage at WTP can be removed not only by coagulation itself, but also by adsorption to clay particle especially for high turbidity water, and by sunlight photodegradation in the areas open to the atmosphere.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Nam SW,Jo BI,Yoon Y,Zoh KD

doi

10.1016/j.chemosphere.2013.08.055

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

156-65

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(13)01171-5

journal_volume

95

pub_type

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