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Behaviour of mono- and diesters of o-phthalic acid in leachates released during digestion of municipal solid waste under landfill conditions
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
2003 (English)In: Advances in Environmental Research, ISSN 1093-0191, E-ISSN 1093-7927, Vol. 7, no 2, 429-440 p.Article in journal (Refereed) Published
Abstract [en]

In order to investigate phthalates in landfill leachates, four landfill simulation reactors, filled with municipal solid waste from a housing area, were studied. Plasticised polyvinyl chloride (PVC) was added to two of the reactors. Two reactors, one with and one without the additional PVC, were aerated for 3 months to achieve methanogenic conditions. The other two became acidogenic a few days after filling and closing. After approximately 3 years, the acidogenic waste became methanogenic. The leachates were analysed for phthalic acid diesters and their degradation products, phthalic acid monoesters and o-phthalic acid. The occurrence of monobenzyl phthalate (MbenzP) and mono(2-ethylhexyl) phthalate (MEHP) showed that the diesters, butylbenzyl phthalate (BBP) and di(2-ethylhexyl) phthalate (DEHP), released from the PVC products had been transformed, and that they were not completely sorbed to particles or to the waste material. Monoesters were observed once methanogenic conditions were established. The monoesters and phthalic acid were present in concentrations several orders of magnitude higher than the diesters themselves. Our results show that it is important to include monoesters in studies of the fate of diesters. To date, monoesters have been neglected in investigations of organic pollutants in landfill leachates.

Place, publisher, year, edition, pages
2003. Vol. 7, no 2, 429-440 p.
Keyword [en]
acidogenic, anaerobic, analysis, degradation, leachate, methanogenic, phthalic acid diester, phthalic acid monoester
National Category
Social Sciences Interdisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-29647DOI: 10.1016/S1093-0191(02)00015-1Local ID: 15027OAI: oai:DiVA.org:liu-29647DiVA: diva2:250464
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2012-08-22Bibliographically approved
In thesis
1. Phthalates in landfill leachates: a signature of their degradation: Analytical aspects & toxicological considerations
Open this publication in new window or tab >>Phthalates in landfill leachates: a signature of their degradation: Analytical aspects & toxicological considerations
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phthalic acid diesters comprise a large group of organic compounds that are used to manufacture a variety of products all over the world, and this has raised concerns about the fate of these compounds in the environment. The diester-containing products often end up in landfills, where they are degraded by various micro-organisms, which gives rise to transient intermediates such as phthalic acid monoesters and ortho-phthalic acid. These degradation products escape detection when applying the analytical protocols used to investigate the well-elucidated diesters, hence other methods are needed.

In the present work, the temporal pattern of degradation was scrutinised by studying leachates from both laboratory-scale Iandfill simulation reactors and newly established fullscale landfill cells. Leachate samples from a transect downstream of a landfill were also examined to highlight possible groundwater contamination from unlined landfills. In addition, extraction techniques were developed for simultaneous detection of diesters, monoesters of o-phthalic acid, and o-phthalic acid itself.

The degradation products of phthalate diesters (i.e. the monoesters and phthalic acid) were found in the landfill leachates, which demonstrates proves that phthalic acid diesters are degraded/transformed in situ in landfills. The monoesters and phthalic acid may accumulate in leachates during certain parts of landfill degradation development, for example, during establishment of the methanogenic micro-flora. The phthalates leached from landfills are potential groundwater contaminants, whereas breakdown of the diesters and monoesters was observed in the studied Iandfill plume. The monoesters and phthalic acid could be detected by proper acidification of the samples and derivatization of the extracts, followed by gas chromatography and mass spectrometry. Acute toxicity tests showed that the monoesters were generally less toxic than the corresponding diesters, and that phthalic acid was the least toxic. These results suggest that degradation of the diesters to monoesters and phthalic acidwill reduce the risk for acute toxic effects on the environment.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2003. 66 p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 268
National Category
Social Sciences Interdisciplinary
Identifiers
urn:nbn:se:liu:diva-29573 (URN)14948 (Local ID)91-7373-588-4 (ISBN)14948 (Archive number)14948 (OAI)
Public defence
2003-01-31, Sal Elysion, Hus-T, Universitetssjukhuset, Linköping, 10:00 (Swedish)
Supervisors
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2014-09-01Bibliographically approved

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