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Featured researches published by Alessandro Brovelli.


Applied and Environmental Microbiology | 2014

Use of silicate minerals for pH control during reductive dechlorination of chloroethenes in batch cultures of different microbial consortia.

Elsa Lacroix; Alessandro Brovelli; David Andrew Barry; Christof Holliger

ABSTRACT In chloroethene-contaminated sites undergoing in situ bioremediation, groundwater acidification is a frequent problem in the source zone, and buffering strategies have to be implemented to maintain the pH in the neutral range. An alternative to conventional soluble buffers is silicate mineral particles as a long-term source of alkalinity. In previous studies, the buffering potentials of these minerals have been evaluated based on abiotic dissolution tests and geochemical modeling. In the present study, the buffering potentials of four silicate minerals (andradite, diopside, fayalite, and forsterite) were tested in batch cultures amended with tetrachloroethene (PCE) and inoculated with different organohalide-respiring consortia. Another objective of this study was to determine the influence of pH on the different steps of PCE dechlorination. The consortia showed significant differences in sensitivities toward acidic pH for the different dechlorination steps. Molecular analysis indicated that Dehalococcoides spp. that were present in all consortia were the most pH-sensitive organohalide-respiring guild members compared to Sulfurospirillum spp. and Dehalobacter spp. In batch cultures with silicate mineral particles as pH-buffering agents, all four minerals tested were able to maintain the pH in the appropriate range for reductive dechlorination of chloroethenes. However, complete dechlorination to ethene was observed only with forsterite, diopside, and fayalite. Dissolution of andradite increased the redox potential and did not allow dechlorination. With forsterite, diopside, and fayalite, dechlorination to ethene was observed but at much lower rates for the last two dechlorination steps than with the positive control. This indicated an inhibition effect of silicate minerals and/or their dissolution products on reductive dechlorination of cis-dichloroethene and vinyl chloride. Hence, despite the proven pH-buffering potential of silicate minerals, compatibility with the bacterial community involved in in situ bioremediation has to be carefully evaluated prior to their use for pH control at a specific site.


Archive | 2014

chloroethenes in batch cultures of different microbial consortia † 2

Elsa Lacroix; Alessandro Brovelli; David Andrew Barry; Christof Holliger


Hydrologic Discovery Through Physical Analysis - Honoring the Scientific Legacies of Wilfried H. Brutsaert and Jean-Yves Parlange | 2012

A3. Effect of Antecedent Conditions on Soil Erosion Dynamics in a Laboratory Flume

Seifeddine Jomaa; David Andrew Barry; Alessandro Brovelli; B. C. P. Heng; G. C. Sander; J.-Y. Parlange


SETAC Europe 21st Annual meeting | 2011

Elimination of Micropollutants using Engineered Constructed Wetlands – A Laboratory Scale Study

Luca Rossi; Alessandro Brovelli; Pierre Queloz; Dien Ho; David Andrew Barry


River corridor restoration conference 2011 | 2011

Modelling of biogeochemical transformations in riparian soils: lessons learned from the Thur river revitalization experiment and open questions

Alessandro Brovelli; Jordi Battle-Aguilar; David Andrew Barry


AGU Fall meeting 2011 | 2011

Soil erosion transport through multiple rainfall events in the presence of stone cover: Laboratory flume experiments and analysis with the Hairsine-Rose model

Seifeddine Jomaa; David Andrew Barry; Alessandro Brovelli; Peter Heng; G. C. Sander; Jean-Yves Parlange


AGU Fall Meeting | 2010

Analysis of carbon and nitrogen turnover in riparian soils undergoing restoration

Alessandro Brovelli; Jordi Batlle-Aguilar; David Andrew Barry; Joerg Luster; Juna Shrestha; Pascal A. Niklaus


eophysical Research Abstracts, European Geosciences Union | 2008

Three-dimensional reactive transport modelling in the vadose zone

Alessandro Brovelli; D. Andrew Barry


Geophysical Research Abstract, European Geoscience Union conference | 2008

Integrated simulation of horizontal flow constructed wetlands

Alessandro Brovelli; Serge Baechler; Luca Rossi; D. Andrew Barry


Geophysical Research Abstract, European Geoscience Union conference | 2008

Hydrodynamic changes of saturated porous media due to biomass growth

Alessandro Brovelli; Flavio Malaguerra; D. Andrew Barry

Collaboration


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D. Andrew Barry

École Polytechnique Fédérale de Lausanne

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David Andrew Barry

École Polytechnique Fédérale de Lausanne

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David Andrew Barry

École Polytechnique Fédérale de Lausanne

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Luca Rossi

École Polytechnique Fédérale de Lausanne

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Christof Holliger

École Polytechnique Fédérale de Lausanne

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Elsa Lacroix

École Polytechnique Fédérale de Lausanne

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G. C. Sander

Loughborough University

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Jordi Batlle-Aguilar

École Polytechnique Fédérale de Lausanne

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