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Micropollutant degradation in a mid-sized lake: Coupling degradation and dilution processes with the lake dynamics

English title Micropollutant degradation in a mid-sized lake: Coupling degradation and dilution processes with the lake dynamics
Applicant Vennemann Torsten
Number 123028
Funding scheme ProDoc
Research institution Institut de Minéralogie et Géochimie Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Hydrology, Limnology, Glaciology
Start/End 01.11.2008 - 31.08.2012
Approved amount 736'055.00
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Keywords (6)

organic micropollutants; water; isotopes; geochemistry; computational chemistry; hydrology

Lay Summary (English)

Lead
Lay summary
As the largest freshwater reservoir within Europe, Lake Geneva exemplifies several key challenges for sustainable freshwater management during the next century. The increasing population within the catchment of the lake will heighten both drinking water demands and exert increasing pressure on adapting the waste water treatment plants, both in terms of avoiding introduction of new organic micropollutants and with respect to the capacities of water treatment. While it is now known that dozens of anthropogenic micropollutants (e.g., ibuprofen, carbamazepine, diclofenac, naproxen, ketoprofen) enter the shallow coastal lake from municipal waste water treatment plants and tributaries, little is known about the transport and fate of these micropollutants.In the framework of a larger ProDoc teaching and research program, this project aims to explain the observed water column distributions of micropollutants in the greater Bay of Vidy region, in terms of underlying physical, chemical, and biological processes. In complementary and parallel activities, we will diagnose: water residence times within the Bay, water export from the Bay and mixing into the deeper lake, extent of atmospheric contact by deep lake water, micropollutant mass transfers to the atmosphere, micropollutant sorption to particles and sediments, and micropollutant removal rates by biotic and abiotic transformations. The work will be divided into three sub-projects that will share a common sampling strategy, but where each will focus on specific points:Sub-Project A. Identifying and measuring the concentrations of a large number of micropollutants entering the lake via three point sources in the Bay of Vidy, as well as determining their removal rates via biotic and abiotic processes on the basis of laboratory experiments.Sub-Project B. Characterizing the chemical processes and parameters that control the transport, partitioning, and persistence of the micropollutants in the lake on the basis of existing empirical and newly developed quantum chemistry-based computational approaches.Sub-Project C. Evaluating the hydrologic dynamics, hence the effects of mixing of variable water sources and evaporation, as well as the global bio-productivity within the water column of the Bay of Vidy using time-series measurements of the stable H- and O-isotope composition of water and the C-isotope composition of the dissolved inorganic carbon.The three sub-projects will cover the work to be done by three doctoral students.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Spatial and temporal presence of a wastewater-derived micropollutant plume in Lake Geneva
Bonvin F., Rutler R., Chèvre N., Halder J., Kohn T. (2011), Spatial and temporal presence of a wastewater-derived micropollutant plume in Lake Geneva, in Environmental Science and Technology, 45(11), 4702-4709.
Occurrence and fate of micropollutants in the Vidy Bay of Lake Geneva, Switzerland. Part II: Micropollutant removal between wastewater and raw drinking water
Morasch B., Bonvin F., Reiser H., Grandjean D., De Alencastro L.F., Perazzolo C., Chèvre N., Kohn T. (2010), Occurrence and fate of micropollutants in the Vidy Bay of Lake Geneva, Switzerland. Part II: Micropollutant removal between wastewater and raw drinking water, in Environmental Toxicology and Chemistry, 29(8), 1658-1668.

Associated projects

Number Title Start Funding scheme
128753 Comprehensive Two-Dimensional Gas Chromatography - Time-of-flight Mass Spectrometry (GCxGC-TOF-MS): A tool to elucide environmental processes affecting complex mixtures 01.02.2011 R'EQUIP
126893 Using quantum chemistry to assess reactivity of contaminants in surface waters 01.01.2010 Project funding (Div. I-III)

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