Natural versus wastewater derived dissolved organic carbon: Implications for the environmental fate of organic micropollutants

Neale, Peta A., Antony, Alice, Gernjak, Wolfgang, Leslie, Greg and Escher, Beate I. (2011) Natural versus wastewater derived dissolved organic carbon: Implications for the environmental fate of organic micropollutants. Water Research, 45 14: 4227-4237. doi:10.1016/j.watres.2011.05.038


Author Neale, Peta A.
Antony, Alice
Gernjak, Wolfgang
Leslie, Greg
Escher, Beate I.
Title Natural versus wastewater derived dissolved organic carbon: Implications for the environmental fate of organic micropollutants
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1016/j.watres.2011.05.038
Volume 45
Issue 14
Start page 4227
End page 4237
Total pages 11
Place of publication Lisle, IL, United States
Publisher IWA Publishing
Collection year 2012
Language eng
Formatted abstract
The interaction of organic micropollutants with dissolved organic carbon (DOC) can influence their transport, degradation and bioavailability. While this has been well established for natural organic carbon, very little is known regarding the influence of DOC on the fate of micropollutants during wastewater treatment and water recycling. Dissolved organic carbon-water partition coefficients (KDOC) for wastewater derived and reference DOC were measured for a range of micropollutants using a depletion method with polydimethylsiloxane disks. For micropollutants with an octanol-water partition coefficient (log KOW) greater than 4 there was a significant difference in KDOC between reference and wastewater derived DOC, with partitioning to wastewater derived DOC over 1000 times lower for the most hydrophobic micropollutants. The interaction of nonylphenol with wastewater derived DOC from different stages of a wastewater and advanced water treatment train was studied, but little difference in KDOC was observed. Organic carbon characterisation revealed that reference and wastewater derived DOC had very different properties due to their different origins. Consequently, the reduced sorption capacity of wastewater derived DOC may be related to their microbial origin which led to reduced aromaticity and lower molecular weight. This study suggests that for hydrophobic micropollutants (log KOW > 4) a higher concentration of freely dissolved and thus bioavailable micropollutants is expected in the presence of wastewater derived DOC than predicted using KDOC values quantified using reference DOC. The implication is that naturally derived DOC may not be an appropriate surrogate for wastewater derived DOC as a matrix for assessing the fate of micropollutants in engineered systems.
Keyword Dissolved organic carbon
Micropollutants
Water recycling
Partition coefficient
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 26 Jul 2011, 10:14:07 EST by Hong Lee on behalf of Advanced Water Management Centre