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Université de Neuchâtel

Geogenic arsenic in groundwater of Burkina Faso

Bretzler, Anja Maria ; Schirmer, Mario (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

In the semi-arid West African Sahel belt, rural populations often rely on groundwater from fractured aquifer systems for their drinking water needs. Recent evidence has shown that some tube wells in northern Burkina Faso are affected by arsenic (As) concentrations above the World Health Organisation’s (WHO) 10 μg/L guideline value. Arsenic is hypothesised to stem from geogenic (naturally...

Université de Neuchâtel

Assessing chlorinated ethene degradation in a large scale contaminant plume by dual carbon–chlorine isotope analysis and quantitative PCR

Hunkeler, Daniel ; Abe, Y ; Broholm, M.M ; Jeannottat, S ; Westergaard, C ; Jacobsen, C.S ; Aravena, R ; Bjerg, P.L

In: Journal of Contaminant Hydrology, 2011, vol. 119, p. 69-79

The fate of chlorinated ethenes in a large contaminant plume originating from a tetrachloroethene (PCE) source in a sandy aquifer in Denmark was investigated using novel methods including compound-specific carbon and chlorine isotope analysis and quantitative real-time polymerase chain reaction (qPCR) methods targeting Dehaloccocides sp. and vcrA genes. Redox conditions were...

Université de Neuchâtel

Influence of conceptual model uncertainty on contaminant transport forecasting in braided river aquifers

Pirot, Guillaume ; Renard, Philippe ; Huber, E ; Straubhaar, J ; Huggenberger, P

In: Journal of Hydrology, 2015, vol. 531, p. 124-141

Hydrogeologist are commonly confronted to field data scarcity. An interesting way to compensate this data paucity, is to use analog data. Then the questions of prediction accuracy and uncertainty assessment when using analog data shall be raised. These questions are investigated in the current paper in the case of contaminant transport forecasting in braided river aquifers. In using analog data...

Université de Neuchâtel

Infiltration under snow cover : Modeling approaches and predictive uncertainty

Meeks, Jessica ; Moeck, Christian ; Brunner, Philip ; Hunkeler, Daniel

In: Journal of Hydrology, 2017, vol. 546, p. 16-27

Groundwater recharge from snowmelt represents a temporal redistribution of precipitation. This is extremely important because the rate and timing of snowpack drainage has substantial consequences to aquifer recharge patterns, which in turn affect groundwater availability throughout the rest of the year. The modeling methods developed to estimate drainage from a snowpack, which typically rely on...

Université de Neuchâtel

Engineered and subsequent intrinsic in situ bioremediation of a diesel fuel contaminated aquifer

Hunkeler, Daniel ; Höhener, P ; Zeyer, J

In: Journal of Contaminant Hydrology, 2002, vol. 59, p. 231-245

A diesel fuel contaminated aquifer in Menziken, Switzerland was treated for 4.5 years by injecting aerated groundwater, supplemented with KNO3 and NH4H2PO4 to stimulate indigenous populations of petroleum hydrocarbon (PHC) degrading microorganisms. After dissolved PHC concentrations had stabilized at a low level, engineered in situ bioremediation was...

Université de Neuchâtel

Engineered in situ bioremediation of a petroleum hydrocarbon-contaminated aquifer : assessment of mineralization based on alkalinity, inorganic carbon and stable carbon isotope balances

Hunkeler, Daniel ; Höhener, P ; Bernasconi, S ; Zeyer, J

In: Journal of Contaminant Hydrology, 1999, vol. 37, no. 3-4, p. 201-223

A concept is proposed to assess in situ petroleum hydrocarbon mineralization by combining data on oxidant consumption, production of reduced species, CH4, alkalinity and dissolved inorganic carbon (DIC) with measurements of stable isotope ratios. The concept was applied to a diesel fuel contaminated aquifer in Menziken, Switzerland, which was treated by engineered in situ...

Université de Neuchâtel

Petroleum hydrocarbon mineralization in anaerobic laboratory aquifer columns

Hunkeler, Daniel ; Jörger, D ; Häberli, K ; Höhener, P ; Zeyer, J

In: Journal of Contaminant Hydrology, 1998, vol. 32, no. 1-2, p. 41-61

The anaerobic biodegradation of hydrocarbons at mineral oil contaminated sites has gathered increasing interest as a naturally occurring remediation process. The aim of this study was to investigate biodegradation of hydrocarbons in laboratory aquifer columns in the absence of O2 and NOۙ, and to calculate a mass balance of the anaerobic biodegradation processes. The...

Université de Neuchâtel

Stable carbon isotope analysis to distinguish biotic and abiotic degradation of 1,1,1-trichloroethane in groundwater sediments

Broholm, M.M ; Hunkeler, Daniel ; Tuxen, N ; Jeannottat, S ; Scheutz, C

In: Chemosphere, 2014, vol. 108, p. 265-273

The fate and treatability of 1,1,1-TCA by natural and enhanced reductive dechlorination was studied in laboratory microcosms. The study shows that compound-specific isotope analysis (CSIA) identified an alternative 1,1,1-TCA degradation pathway that cannot be explained by assuming biotic reductive dechlorination. In all biotic microcosms 1,1,1-TCA was degraded with no apparent increase in the...