Ozonation in advanced treatment of secondary municipal wastewater effluents for the removal of micropollutants

Serdar Dogruel*, Zuhal Cetinkaya Atesci, Egemen Aydin, Elif Pehlivanoglu-Mantas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The objective of this study was the experimental evaluation of ozonation as an additional treatment step for the removal emerging contaminants from secondary effluents of two wastewater treatment plants (WWTPs), one receiving a primarily domestic wastewater (WWTP-A), and the other one domestic sewage together with pretreated tannery wastewater streams (WWTP-B). The experimental runs were conducted at two different pH values (i.e., original pH and adjusted pH of 10) and at six different ozone doses ranging between 0.2 and 1.5 mg O3/mg DOC. A total of 20 compounds, including 12 micropollutants (MPs) and 8 metabolites, were selected as the target analytes for the evaluation of ozonation performance. When the tested MPs and metabolites were considered individually, the maximum elimination level for each compound was reached at different doses; therefore, optimum ozone doses were determined based on the reduction of the total MP content. Ozonation at the original pH with an ozone dose in the range of 0.4–0.6 and 0.8–1.0 mg O3/mg DOC was selected as the optimum operating condition for WWTP-A and WWTP-B, respectively, both resulting in an average overall removal efficiency of 55%. Ozone treatment yielded only poor elimination for o-desmethyl naproxen (15%), which was found to be by far the main contributor accounting alone for approximately 30% of the total MP concentration in the secondary effluents. The systematic approach used in this study could well be adopted as a guide to other domestic and municipal WWTPs, which are thought to have a highly variable composition in terms of the MPs and metabolites.

Original languageEnglish
Pages (from-to)45460-45475
Number of pages16
JournalEnvironmental Science and Pollution Research
Volume27
Issue number36
DOIs
Publication statusPublished - Dec 2020

Bibliographical note

Publisher Copyright:
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

Funding

This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project #114Y487) and Istanbul Technical University Research Fund (ITU-BAP, Project #39421). Acknowledgments The authors would like to thank the technical staff of Istanbul Water and Sewerage Administration (ISKI) for their assistance during the collection of samples.

FundersFunder number
ISKI
ITU-BAP39421
Istanbul Water and Sewerage Administration
TUBITAK114Y487
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi

    Keywords

    • Advanced treatment
    • Emerging contaminants
    • Metabolites
    • Micropollutants
    • Municipal wastewater
    • Ozonation
    • Removal efficiency
    • Secondary effluent

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