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Behavior and fate of anthropogenic substances at a Swedish sewage treatment plant
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Arcum)
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2010 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 62, no 12, 2880-2888 p.Article in journal (Refereed) Published
Abstract [en]

The behavior and fate of anthropogenic substances during sewage treatment were investigated at a sewage treatment plant (STP) in Sweden which uses mechanical, chemical, and biological methods for sewage treatment and anaerobic digestion of sludge. Influent and effluent water, and sludge from two specific treatment sites were sampled. Mass balances were calculated from measured concentrations of various substances and estimates of the mass flows (water, solids) throughout the process. The results show that the metals (As, Cd, Cr, Hg, Pb) and the majority of PCBs, PCDD/Fs, and PBDEs enter and leave the STP bound to particles. Triclosan and di-(2-ethylhexyl)phthalate adsorb to sludge to a high degree, while the metals (Co, Cu, Ni, Zn) and organophosphate esters seem to pass through the STP unaffected by the process. Generally, the STP was better in removing lipophilic than water soluble compounds. Most of the substances end up in anaerobically digested sludge in almost the same concentrations as in primary sludge. A fugacity based STP model was evaluated for its ability to predict the behavior and fate of the substances and was found feasible for lipophilic compounds. It did however produce poor predictions for water soluble compounds such as organophosphate esters (overestimated) and antibacterial agents (underestimated).

Place, publisher, year, edition, pages
IWA Publishing, 2010. Vol. 62, no 12, 2880-2888 p.
Keyword [en]
cold climate STP, emerging pollutants, mass balances, POP, PPCP, sewage water and sludge
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-38683DOI: 10.2166/wst.2010.987ISI: 000285237600019PubMedID: 21123918OAI: diva2:380229
Available from: 2010-12-21 Created: 2010-12-21 Last updated: 2016-06-17Bibliographically approved
In thesis
1. Removal processes in sewage treatment plants: Sludge quality and treatment efficiency of structurally diverse organic compounds
Open this publication in new window or tab >>Removal processes in sewage treatment plants: Sludge quality and treatment efficiency of structurally diverse organic compounds
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Large and ever-increasing numbers of chemicals, including large quantities of a broad spectrum of organic compounds are used in modern society. More than 30 000 of the more than 100 000 chemical substances registered in the EU are estimated to be daily used, of which many will be discharged into the waste-streams handled by municipal sewage treatment plants (STPs). The main objective of the work underlying this thesis was to improve understanding of the relationships between the characteristics of sewage contaminants and their sewage treatment efficiency. Further objectives were to examine the relationships between socio-economic uses of chemicals and sludge quality, and the effects of regulatory actions on sludge quality.

The quality of the sewage sludge and the levels and distribution patterns of the sludge contaminants, both within and between the STPs, seem to remain quite constant over time. The overall findings indicate that the levels of contaminants in sewage sludge seem to be largely independent of the location, size and treatment techniques applied at the STPs, and generally, of the types of human activity connected to them. The total and relative concentrations of the sludge contaminants were found to be fairly constant on a dry weight basis, with some exceptions, indicating that the pollutants originate from broad usage and diffuse dispersion rather than (industrial) point sources. The proportion of cyclic methylsiloxanes recovered in sludge seems to strongly depend on their vapour pressure, which decreases with the number of siloxane units. The higher water solubility and biodegradability of organophosphorus flame retardants and plasticizers than polybrominated diphenyl ethers (PBDEs) were also reflected in lower percentages (relative to their national use) found in sludge.

Significant time-trends in levels of a-third of the sludge contaminants included in the annual national measurement program were detected over a period of seven years. The levels of compounds displaying significant time-trends generally decreased following declines in the quantities used nationally. However, a quarter of these compounds showed increasing trends, of which the linear methylsiloxanes followed the same trend as used quantities. The decaBDE was also found to be increasing in sludge, probably as a result of the phase-out of pentaBDE and octaBDE.

The results indicate that the STP removal efficiency of anthropogenic substances, in Sweden, is generally good and that STPs, at least those in cold climates, do not efficiently remove certain polar contaminants. A non-targeted screening (by use of environmetrics and GCxGC-TOFMS) was performed and found to fulfil the objective to assess the STP removal efficiency, with emphasis to systematically analyse which compound classes that are not efficiently removed using the current STP technology. Many polar aromatic compounds were identified to be poorly removed.

The acquired data on levels, profiles and variations in sludge contaminants (sludge quality) extend both the available information and understanding of the degree and nature of sludge contamination, which should help attempts to track changes in its contaminants and revisions, if necessary, of guideline values. This thesis also contributes to improve the knowledge base for the development of future STP technologies, and that archived sewage sludge can be used in retrospective analysis of new and emerging pollutants.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2012. 90 p.
Environmetrics, flame retardants, GCxGC, non-targeted screening, mass flow, metals, plasticizers, poorly removed contaminants, POP, PPCP, prediction, Principal Component Analysis, removal efficiency, sewage, sewage treatment plants, sludge, sludge adsorption, sources, time-trend analysis
National Category
Chemical Sciences
urn:nbn:se:umu:diva-51315 (URN)978-91-7459-356-3 (ISBN)
Public defence
2012-02-10, Naturvetarhuset, Hörsal N320, Umeå universitet, Umeå, 10:00 (English)
Available from: 2012-01-20 Created: 2012-01-17 Last updated: 2012-01-18Bibliographically approved

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