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Title: Required ozone doses for removing pharmaceuticals from wastewater effluents
Authors: Antoniou, Maria G. 
Hey, Gerly 
Rodríguez Vega, Sergio 
Spiliotopoulou, Aikaterini 
Fick, Jerker 
Tysklind, Mats 
La Cour Jansen, Jes 
Andersen, Henrik Rasmus 
Keywords: Matrix effect;Ozonation;Ozone dose;Pharmaceuticals;Wastewater
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: 1-Jul-2013
Publisher: Elsevier
Source: Science of the Total Environment, 2013, Volume 456-457, Pages 42-49
Abstract: The aim of the this study was to investigate the ozone dosage required to remove active pharmaceutical ingredients (APIs) from biologically treated wastewater of varying quality, originated from different raw wastewater and wastewater treatment processes.Secondary effluents from six Swedish wastewater treatment plants (WWTP) were spiked with 42 APIs (nominal concentration 1μg/L) and treated with different O3 doses (0.5-12.0mg/L ozone) in bench-scale experiments.In order to compare the sensitivity of APIs in each matrix, the specific dose of ozone required to achieve reduction by one decade of each investigated API (DDO3) was determined for each effluent by fitting a first order equation to the remaining concentration of API at each applied ozone dose. Ozone dose requirements were found to vary significantly between effluents depending on their matrix characteristics.The specific ozone dose was then normalized to the dissolved organic carbon (DOC) of each effluent. The DDO3/DOC ratios were comparable for each API between the effluents.15 of the 42 investigated APIs could be classified as easily degradable (DDO3/DOC≤0.7), while 19 were moderately degradable (0.7<DDO3/DOC≤1.4), and 8 were recalcitrant towards O3-treatment (DDO3/DOC >1.4). Furthermore, we predict that a reasonable estimate of the ozone dose required to remove any of the investigated APIs may be attained by multiplying the experimental average DDO3/DOC obtained with the actual DOC of any effluent.
ISSN: 00489697
DOI: 10.1016/j.scitotenv.2013.03.072
Rights: © 2013 Elsevier B.V..
Type: Article
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