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Patrick Levallois

Bio: Patrick Levallois is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

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TL;DR: In this paper, the authors present six defis pour la sante publique dans le dossier de l'eau potable pour les annees futures, and conclude that le probleme de la qualite de l’eau de boisson doit etre apprehende dans une perspective mondiale.
Abstract: L’eau que nous consommons chaque jour est essentielle a la vie. Sa qualite a toujours ete un element indispensable a un environnement favorable a la sante. Actuellement, loin d’avoir ete resolu, le probleme de la qualite de l’eau de boisson est toujours une priorite de sante publique, autant dans les pays en voie de developpement que dans les pays industrialises. Ce texte presente six defis pour la sante publique dans le dossier de l’eau potable pour les annees futures : Finalement, le probleme de la qualite de l’eau potable doit etre apprehende dans une perspective mondiale.

3 citations


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TL;DR: In this article, the authors focused on the removal of methylene blue (MB) from aqueous solution by adsorption (bach method) on polyacrylonitrile-co-sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) synthetic membranes which were prepared specifically for this purpose.
Abstract: The scope of this work is focused on the removal of methylene blue (MB) from aqueous solution by adsorption (bach method) on polyacrylonitrile-co-sodium methallyl sulfonate copolymer (AN69) and polyacrylic acid (PAA) synthetic membranes which were prepared specifically for this purpose. Investigations have covered membrane properties and the determination of adsorption parameters. The immobilization of PAA chains into AN69 matrix was revealed by FTIR analysis, whereas the presence of small superficial microcavities was demonstrated by AFM scanning. Otherwise, the increase in PAA fraction (0 to 10%), in membrane composition, induces an increase in swelling ratio (12–22%) and ionic exchange capacity (0.8–1.2 meq/g). Moreover, the equilibrium adsorption capacity improves with the increase in alkalinity of initial adsorbate solution (pH = 2–11) and with the concentration (C = 20–80 mg/L). The results of kinetic adsorption show that the mechanism of adsorption is perfectly fitted by pseudo-second order (R2 = 0.999) and the isotherm adsorption follows the Freundlich isotherm (R2 = 0.98). From the different applied adsorption models, it was found that the maximum Langmuir adsorption capacity Qm was 116 mg/g and the Freundlich index of adsorption n was 2.2.

2 citations

Journal ArticleDOI
15 Sep 2012
TL;DR: In this article, the authors propose an adaptation of l'approche contextualiste de Pettigrew (1990, 1992) to the context of coalitions, un concept propre a l’approche des reseaux de politiques publiques.
Abstract: Cet article vise la comprehension du contexte et du jeu des acteurs ayant mene a l’adoption du Reglement sur la qualite de l’eau potable. Cette initiative a permis au Quebec de se positionner parmi les Etats ayant des normes de qualite et des controles de production parmi les plus rigoureux sur le continent nord-americain. Une adaptation de l’approche contextualiste de Pettigrew (1990 ; 1992) est retenue comme cadre d’analyse. Cette approche insiste sur l’importance, au moment d’un changement, de l’interaction entre trois dimensions : le contexte, le contenu et le processus. De maniere a preciser cette derniere dimension, il est propose de recourir a l’idee de coalitions, un concept propre a l’approche des reseaux de politiques publiques. Cet apport permet de mieux cerner l’influence des organisations externes a l’appareil gouvernemental et de fournir une explication des relations entre les differentes dimensions du contextualiste.

2 citations

Journal ArticleDOI
TL;DR: In this paper , a prospective and analytical study on three sites where hospital effluents from the intensive care unit (station A), the upstream of the wastewater treatment plant (station B), and the gynaecology, surgery and hospitalisation departments (station C) were sampled.
Abstract: The untreated effluents generated by hospital activities contribute to the dissemination of pathogenic germs and multi-resistant bacteria, thus presenting a great potential danger for health and the environment. The objective of this study was to evaluate the microbiological and physico-chemical quality of the effluents of the Yaoundé University Hospital Centre and their impact on the environment. It was a prospective and analytical study on three sites where hospital effluents from the intensive care unit (Station A), the upstream of the wastewater treatment plant (Station B), and the gynaecology, surgery and hospitalisation departments (Station C) were sampled. Samples were collected in sterile glass bottles for bacteriological analyses and polyethylene bottles for physico-chemical analyses. The bacteriological parameters measured showed that the density of the bacterial species sought was very high at Station B with a predominance of the species Escherichia coli (57.36%). At Station A, total coliforms were very abundant (50.12%) and at Station C, the genus Pseudomonas was predominant (14.69%). Bacteria of the genus Streptococcus were represented by three species, namely: Streptococcus agalactiae, Streptococcus faecalis, and Streptococcus pneumoniae. The Pseudomonas genus was also represented by 3 species, namely Pseudomonas aeruginosa, Pseudomonas maltophilia and Pseudomonas putida. The physico-chemical parameters showed that apart from temperature and conductivity, which were in compliance with the standards, the other had values higher than these standards. This study shows that untreated hospital effluent contains most of the bacteria involved in community, nosocomial infections and would be a potential source of risk to the surrounding population.