Sanitary mapping of well waters in the commune of Bimbo in the Central African Republic (CAR)

This study concerns the strategies for controlling and monitoring the quality of well waters consumed by the population of Bimbo, in the Central African Republic. The majority of the population has no access to clean, safe drinking water, and the distribution network of drinking water only reaches around 20 % of the urban population in the town centre. A population explosion in the Central African Republic has led to a very strong rural exodus, which has resulted in increasing consumption of poor quality drinking water. Futhermore, the virtual absence of a system for collecting wastewater only serves to increase the vulnerability of these shallow reservoirs. Such constraints are common in large African cities, where around 80 % of the population live in areas that have become urbanised in an ad hoc fashion. In such contexts, it is extremely difficult to reconcile groundwater extraction with public health

Elimination of turbidity and bacterial contamination in natural water sources (Ubangi river, Central Africa)

Having access to a natural source of water of sufficiently high quality for human consumption has become a strategic concern for the entire world. In fact, drinking water resources in developing countries are almost non-existent, as they are overused or polluted by intense human activity. Our study aims to develop a natural filter that reduces turbidity and eliminates human pathogens. The process developed should be inexpensive and minimize the use of chemical reagents, and should not be labor intensive. In this context, horizontal sand filtration that uses the natural process of water purification occurring in an aquifer can be regarded as the most suitable water treatment process for developing countries.Disposer d’une source d’eau naturelle de bonne qualité, pour la consommation humaine, est devenu maintenant une préoccupation stratégique pour le monde entier. En effet, les ressources en eaux potables dans les pays en voie de développement sont quasi-inexistantes, car surexploitées ou souillées par une activité humaine intense. L’étude que nous proposons a pour objectif : de mettre au point un filtre naturel qui diminue la turbidité et élimine les agents pathogènes pour l’homme. Le procédé développé peu onéreux devra réduire au maximum l’utilisation de réactifs chimiques, et minimiser toutes interventions humaines. La filtration horizontale sur sable qui utilise le processus naturel de purification de l’eau se produisant dans une nappe aquifère, peut être considéré comme le procédé de traitement de l’eau le plus approprié aux pays en voie de développement et répond aux objectifs fixés.Disponer de una fuente de agua natural de buena calidad, apta para el consumo humano, se ha convertido actualmente en una preocupación estratégica en todo el mundo. En efecto, los recursos de agua potable en los países en vías de desarrollo son prácticamente inexistentes, por exceso de explotación o por contaminación a causa de una actividad humana intensa.El estudio que proponemos tiene por objetivo: desarrollar un filtro natural que reduzca la turbidez y elimine los agentes patógenos perjudiciales para el hombre. El procedimiento desarrollado, de bajo coste, debería reducir al máximo el uso de sustancias químicas reactivas y minimizar cualquier intervención humana. Como la filtración horizontal sobre arena que utiliza el proceso natural de purificación del agua tiene lugar en una capa acuífera, se puede considerar como el procedimiento de tratamiento del agua más adecuado a los países en vías de desarrollo y responde a los objetivos fijados

Sanitary mapping of well waters in the commune of Bimbo in the Central African Republic (CAR)

This study concerns the strategies for controlling and monitoring the quality of well waters consumed by the population of Bimbo, in the Central African Republic. The majority of the population has no access to clean, safe drinking water, and the distribution network of drinking water only reaches around 20 % of the urban population in the town centre. A population explosion in the Central African Republic has led to a very strong rural exodus, which has resulted in increasing consumption of poor quality drinking water. Futhermore, the virtual absence of a system for collecting wastewater only serves to increase the vulnerability of these shallow reservoirs. Such constraints are common in large African cities, where around 80 % of the population live in areas that have become urbanised in an ad hoc fashion. In such contexts, it is extremely difficult to reconcile groundwater extraction with public health

Sanitary mapping of well waters in the commune of Bimbo in the Central African Republic (CAR)

This study concerns the strategies for controlling and monitoring the quality of well waters consumed by the population of Bimbo, in the Central African Republic. The majority of the population has no access to clean, safe drinking water, and the distribution network of drinking water only reaches around 20 % of the urban population in the town centre. A population explosion in the Central African Republic has led to a very strong rural exodus, which has resulted in increasing consumption of poor quality drinking water. Futhermore, the virtual absence of a system for collecting wastewater only serves to increase the vulnerability of these shallow reservoirs. Such constraints are common in large African cities, where around 80 % of the population live in areas that have become urbanised in an ad hoc fashion. In such contexts, it is extremely difficult to reconcile groundwater extraction with public health

MAS NMR investigations on a metakaolinite-rich brick after zeolitization by alkaline treatments

International audienc

Comparative study between M. oleifera and aluminum sulfate for water treatment: case study Colombia

The world has a water deficit, mostly located in developing countries. For example, in Colombia, water deficit is a major concern and it increases in rural areas, where the rate of accessibility to drinking water is of 33.26 % in 2005. Since the 1970s, the most used technology for water purification is the conventional physicochemical process. The most common coagulant used in this process is aluminum sulfate (alum). This study focuses on a comparison between Moringa oleifera seeds and alum for water treatment in different natural waters. Results showed that M. oleifera removed 90 % turbidity and alum 96 % from water samples from the tested natural brook. However, color removal for M. oleifera was 95 and 80.3 % for alum. For water-polluted samples, both coagulants have shown high efficiency (100 %) in color and turbidity removal. Usage of natural coagulants (i.e., M. oleifera) instead of chemical ones (i.e., alum) are more convenient in rural areas where the economic situation and accessibility of those products are key elements to maintain fresh water treatment standards. Additionally, results demonstrated that high dosages M. oleifera did not affect the optimal value in terms of color and turbidity removal. In rural and developing countries, this is important because it does not require a sophisticated dosing equipment