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Biodegradation of Chemicals in Unspiked Surface Waters Downstream of Wastewater Treatment Plants
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.ORCID iD: 0000-0002-2379-0768
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.ORCID iD: 0000-0001-9159-6652
Number of Authors: 22019 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 53, no 4, p. 1884-1892Article in journal (Refereed) Published
Abstract [en]

The OECD 309 guideline uses spiked incubation tests to provide data on biodegradation kinetics in surface waters. However, potential limitations of spiking test chemicals into the studied water have not been investigated. We conducted the OECD 309 test with unspiked surface water relying on chemical residues present in the water. Parallel experiments were conducted with the same water spiked with 13 chemicals at higher concentrations (50 mu g L-1). Six chemicals detected in both the spiked and the unspiked systems were biodegraded. For each chemical the concentration change over time differed between the systems. Tramadol and venlafaxine showed constant concentrations in the spiked systems but increasing concentrations in the unspiked systems. Atenolol and metoprolol showed first-order elimination with no lag in the unspiked systems, compared to a lag of 15-28 d followed by zero-order elimination kinetics in the spiked systems. Acesulfame was only slightly degraded (<50%) in the unspiked system, while removal was complete (>99%) in the spiked systems. Gabapentin displayed a complex behavior where the features differed markedly between the spiked and the unspiked systems. We conclude that spiking can strongly influence biodegradation, reducing the environmental relevance of test results. Under some conditions biodegradation can be measured in unspiked natural waters instead.

Place, publisher, year, edition, pages
2019. Vol. 53, no 4, p. 1884-1892
National Category
Environmental Engineering Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-167522DOI: 10.1021/acs.est.8b05191ISI: 000459642500017PubMedID: 30674186OAI: oai:DiVA.org:su-167522DiVA, id: diva2:1305973
Available from: 2019-04-21 Created: 2019-04-21 Last updated: 2019-04-21Bibliographically approved

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