Publications by David Hunkeler

Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate

Jutta Christine Wandrey, Hamideh Ahmadloo, Ineide Cruz Pinheiro, David Hunkeler

The study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systema ...

Inst Chemical Engineers2015

An experimental design methodology to evaluate the importance of different parameters on flocculation by polyelectrolytes

Jutta Christine Wandrey, Hamideh Ahmadloo, Ineide Cruz Pinheiro, David Hunkeler

Aggregation of particles is fundamental for improving the performance of many solid/liquid processes. Aggregation can be induced by different means, and one of the most common is based on the addition of polymeric additives, namely polyelectrolytes. In thi ...

Elsevier Science Sa2013

Solution viscosity and flocculation characteristics of linear polymeric flocculants in various media

Jutta Christine Wandrey, David Hunkeler

Rheological characteristics of linear copolymers of acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (Q9), differing in molar mass and chemical composition, have been studied in distilled water (DW) and industrial water (IW) obtained from a ...

2011

Flocculation by Cationic Polyelectrolytes: Relating Efficiency with Polyelectrolyte Characteristics

Jutta Christine Wandrey, David Hunkeler

A series of acrylamide/dimethylaminoethylacrylate methyl chloride copolymers (AM-co-DMAEA) was evaluated as flocculants for model Precipitated Calcium Carbonate (FCC) in distilled water. These cationic polyelectrolytes (PEL) differed by their AM/DMAEA rati ...

Wiley-Blackwell2010

Benzene dispersion and natural attenuation in an alluvial aquifer with strong interactions with surface water

Jordi Batlle-Aguilar, David Hunkeler

Field and laboratory investigations have been conducted at a former coke plant, discharging to an adjacent river, in order to assess pollutant attenuation in a contaminated alluvial aquifer. Various organic (BTEX, PAHs, mineral oils) and inorganic (As, Zn, ...

2009

Review: microbial biocenoses in pristine aquifers and an assessment of investigative methods

Pierre Rossi, David Hunkeler

The current knowledge on microbial biocenoses (communities) in pristine aquifers is presented in a review, which also discusses their relevance for questions of groundwater protection. Aquifers are heterogeneous on all scales and structured in a variety of ...

Springer Verlag2006

Effect of microcapsule composition and short-term immunosuppression on intraportal biocompatibility

Jutta Christine Wandrey, David Hunkeler, Dianelys Sainz Vidal

With higher nutrient and oxygen supply and close contact to blood, the portal vein is a possible alternative to the peritoneal cavity for transplantation of encapsulated cells. Data regarding intraportal biocompatibility of microcapsules are lacking. Micro ...

2005

Trajectory Following for the Optimization of a Batch Polymerization Reactor

Dominique Bonvin, Grégory François, Carsten Welz, David Hunkeler

This paper considers the minimization of batch time for an industrial inverse-emulsion polymerization reactor in the presence of uncertainty. A first optimization study resulted in the current industrial practice of a semi-adiabatic profile (isothermal ope ...

2004

Characterization of microcapsules

Jutta Christine Wandrey, David Hunkeler

A review on the methods of characterization of multicomponent microcapsules. Requirements to measure the ingress and egress of small and macromols. through the membrane are discussed, along with the relevant theory. The relevant factors to consider in micr ...

2004

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David Hunkeler

Modelling of C/Cl isotopic behaviour during chloroethene biotic reductive dechlorination: Capabilities and limitations of simplified and comprehensive models

Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate

An experimental design methodology to evaluate the importance of different parameters on flocculation by polyelectrolytes

Solution viscosity and flocculation characteristics of linear polymeric flocculants in various media

Flocculation by Cationic Polyelectrolytes: Relating Efficiency with Polyelectrolyte Characteristics

Benzene dispersion and natural attenuation in an alluvial aquifer with strong interactions with surface water

Review: microbial biocenoses in pristine aquifers and an assessment of investigative methods

Effect of microcapsule composition and short-term immunosuppression on intraportal biocompatibility

Trajectory Following for the Optimization of a Batch Polymerization Reactor

Characterization of microcapsules

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Modelling of C/Cl isotopic behaviour during chloroethene biotic reductive dechlorination: Capabilities and limitations of simplified and comprehensive models

Trajectory Following for the Optimization of a Batch Polymerization Reactor

Effect of microcapsule composition and short-term immunosuppression on intraportal biocompatibility

Review: microbial biocenoses in pristine aquifers and an assessment of investigative methods

Benzene dispersion and natural attenuation in an alluvial aquifer with strong interactions with surface water

Flocculation by Cationic Polyelectrolytes: Relating Efficiency with Polyelectrolyte Characteristics

Solution viscosity and flocculation characteristics of linear polymeric flocculants in various media

An experimental design methodology to evaluate the importance of different parameters on flocculation by polyelectrolytes

Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate

Characterization of microcapsules