Université de Neuchâtel

Riverbank filtration within the context of river restoration and climate change

Diem, Samuel ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

Drinking water derived by riverbank filtration is generally of high quality and is an important source of drinking water in several European countries. In the future however, riverbank-filtration systems will face two major challenges – river restoration and climate change. The goal of this Ph.D. Thesis was to deepen the understanding of physical and biogeochemical processes that occur during...

Université de Neuchâtel

Development of a system for "in situ" determination of chlorinated hydrocarbons in groundwater

Boutsiadou, Xanthippe ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Volatile organic compounds (VOCs), and especially chlorinated hydrocarbons, are common groundwater contaminants. Efficient monitoring that can be conducted directly in the field is needed to detect a possible pollution by organic contaminants such as chlorinated hydrocarbons. The general aim of this project is to develop a portable instrument for the in situ measurement of chlorinated...

Université de Neuchâtel

Prediction of groundwater quality using transfer functions - an approach to link historical data to future concentrations

Baillieux, Antoine ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Groundwater quality has been degraded by anthropogenic activities at many locations. In order to reverse upward concentration trends, environmental programs such as land use changes are frequently implemented. To evaluate the efficiency of such measures, methods linking the evolution of the groundwater quality at public-supply wells to the history of pollutant inputs in their capture zones are...

Université de Neuchâtel

Groundwater contamination from urban line sources : monitoring and evaluation approach with integral pumping tests

Leschik, Sebastian ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.) ; Liedl, Rudolf (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

Urban areas can affect groundwater quality by releasing wastewater-borne contaminants including inorganic compounds and micropollutants. Sewer networks and urban streams that receive effluent from wastewater treatment plants, for example, act as wastewater transport pathways, while potentially losing treated or untreated wastewater to groundwater. Collectively, these pathways are known as urban...

Université de Neuchâtel

Micropollutants in urban receiving waters

Musolff, Andreas ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2139.

Currently half of the world’s population resides in cities. The ongoing urban land consumption has a tremendous impact on the entire water balance of urban areas. Apart from water quantity, the water quality has also strongly deteriorated. In particular, micropollutants from domestic and industrial wastewater are of growing concern. Despite their low concentrations, micropollutants can act as...

Université de Neuchâtel

Assessment of in situ biodegradation of chlorinated solvents in aquifers and constructed wetlands using an integrative approach

Imfeld, Gwenaël ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.2069.

Knowledge about biogeochemical processes associated with natural attenuation of chlorinated solvents in the environment is currently limited. Though processes such as sorption, volatilization or dilution may contribute to contaminant natural attenuation, in situ biodegradation is the only process leading to destructive removal of contaminants. However, the distribution of hydrological and...

Université de Neuchâtel

Use of natural and artificial reactive tracers to investigate the transfer of solutes in karst systems

Savoy, Ludovic ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1985.

Numerous studies in unconsolidated aquifers have shown that natural attenuation, mainly due to biodegradation, can substantially reduce the contaminant mass in an aquifer. Much less is known about the relevance of natural attenuation in karst aquifers. This project investigated the potential for attenuation of dissolved compounds by biodegradation in the karst unsaturated zone. To what extent...

Université de Neuchâtel

Use of stable isotopoe analyses to assess natural attenuation of chlorinated ethenes in groundwater

Abe, Yumiko ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1970.

Chlorinated ethenes are among the most frequently detected groundwater contaminants in industrially developed countries. Although their degradation pathways have been understood, assessing the progress of natural attenuation of chlorinated ethenes still remains a challenge. This thesis explored the possibilities and limits of the use of compound-specific stable isotope analysis as a field...

Université de Neuchâtel

Use of stable isotope analysis to assess biodegradation of volatile organic compounds in the unsaturated subsurface

Bouchard, Daniel ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; 1914.

The general aim of the project is to evaluate the feasibility of using compound-specific isotope analysis (CSIA) to assess biodegradation of petroleum hydrocarbons in the unsaturated zone. The first objective was to quantify the isotope enrichment factors during biodegradation of several volatile organic compounds (VOCs) commonly found on petroleum hydrocarbon contaminated sites. These microcosm...