Université de Neuchâtel

Application of carbon-chlorine isotopic analysis to determine the origin and fate of chlorinated ethenes in groundwater

Badin, Alice ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Chlorinated ethenes are ubiquitous groundwater contaminants posing a threat to one of our main drinking water sources. Despite their spill history dating back to more than 40 years ago, these contaminants are still found in groundwater in numerous industrially developed countries due to their persistence, difficult characterisation in the subsurface and resulting challenging remediation. When...

Université de Neuchâtel

Identification of abiotic and biotic reductive dechlorination in a chlorinated ethene plume after thermal source remediation by means of isotopic and molecular biology tools

Badin, Alice ; Broholm, Mette M ; Jacobsen, Carsten S ; Palau, Jordi ; Dennis, Philip ; Hunkeler, Daniel

In: Journal of Contaminant Hydrology, 2016, vol. 192, p. 1-19

Thermal tetrachloroethene (PCE) remediation by steam injection in a sandy aquifer led to the release of dissolved organic carbon (DOC) from aquifer sediments resulting in more reduced redox conditions, accelerated PCE biodegradation, and changes in microbial populations. These changes were documented by comparing data collected prior to the remediation event and eight years later. Based on the...

Université de Neuchâtel

Multiple Dual C−Cl Isotope Patterns Associated with Reductive Dechlorination of Tetrachloroethene

Badin, Alice ; Buttet, Géraldine ; Maillard, Julien ; Holliger, Christof ; Hunkeler, Daniel

In: Environmental science & technology, 2014, vol. 48, p. 9179-9186

Dual isotope slopes are increasingly used to identify transformation pathways of contaminants. We investigated if reductive dechlorination of tetrachloroethene (PCE) by consortia containing bacteria with different reductive dehalogenases (rdhA) genes can lead to variable dual C−Cl isotope slopes and if different slopes also occur in the field. Two bacterial enrichments harboring...