Monitoring the biological activity of micropollutants during advanced wastewater treatment with ozonation and activated carbon filtration

Macova, M., Escher, B. I., Reungoat, J., Carswell, S., Lee Chue, K., Keller, J. and Mueller, J. F. (2010) Monitoring the biological activity of micropollutants during advanced wastewater treatment with ozonation and activated carbon filtration. Water Research, 44 2: 477-492. doi:10.1016/j.watres.2009.09.025


Author Macova, M.
Escher, B. I.
Reungoat, J.
Carswell, S.
Lee Chue, K.
Keller, J.
Mueller, J. F.
Title Monitoring the biological activity of micropollutants during advanced wastewater treatment with ozonation and activated carbon filtration
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2010-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.watres.2009.09.025
Volume 44
Issue 2
Start page 477
End page 492
Total pages 16
Editor Thomas Ternes
Urs von Gunten
Place of publication Oxford, U.K.
Publisher Pergamon Press
Collection year 2010
Language eng
Subject 050206 Environmental Monitoring
960611 Urban Water Evaluation (incl. Water Quality)
C1
Abstract A bioanalytical test battery was used to monitor the removal efficiency of organic micropollutants during advanced wastewater treatment in the South Caboolture Water Reclamation Plant, Queensland, Australia. This plant treats effluent from a conventional sewage treatment plant for industrial water reuse. The aqueous samples were enriched using solid-phase extraction to separate some organic micropollutants of interest from metals, nutrients and matrix components. The bioassays were chosen to provide information on groups of chemicals with a common mode of toxic action. Therefore they can be considered as sum indicators to detect certain relevant groups of chemicals, not as the most ecologically or human health relevant endpoints. The baseline toxicity was quantified with the bioluminescence inhibition test using the marine bacterium Vibrio fischeri. The specific modes of toxic action that were targeted with five additional bioassays included aspects of estrogenicity, dioxin-like activity, genotoxicity, neurotoxicity, and phytotoxicity. While the accompanying publication discusses the treatment steps in more detail by drawing from the results of chemical analysis as well as the bioanalytical results, here we focus on the applicability and limitations of using bioassays for the purpose of determining the treatment efficacy of advanced water treatment and for water quality assessment in general. Results are reported in toxic equivalent concentrations (TEQ), that is, the concentration of a reference compound required to elicit the same response as the unknown and unidentified mixture of micropollutants actually present. TEQ proved to be useful and easily communicable despite some limitations and uncertainties in their derivation based on the mixture toxicity theory. The results obtained were reproducible, robust and sensitive. The TEQ in the influent ranged in the same order of magnitude as typically seen in effluents of conventional sewage treatment plants. In the initial steps of the treatment chain, no significant degradation of micropollutants was observed, and the high levels of dissolved organic carbon probably affected the outcome of the bioassays. The steps of coagulation/flocculation/dissolved air flotation/sand filtration and ozonation decreased the effect-based micropollutant burden significantly. Copyright © 2009 Elsevier Ltd All rights reserved.
Keyword Bioassays
Baseline toxicity
Phytoxicity
Estrogencity
Genotoxicity
Toxic equivalency concept
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Available online 16 September 2009. Special Issue title: Emerging Contaminants in water: Occurrence, fate, removal and assessment in the water cycle (from wastewater to drinking water)

 
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Created: Sun, 07 Mar 2010, 02:49:31 EST by Professor Beate Escher on behalf of National Res Centre For Environmental Toxicology