New model for performance prediction in fixed-bed reactors based on the approach of the unused bed zone.

In the present study a practical model useful for designers dealing with pilot scale reactors for pollutant control has been developed. Investigations were undertaken for a single-component lead study on New Zealand clinoptilolite at the temperature of 25+/-1 degrees C. Fifteen runs under different operating conditions such as particle characteristics (expressed as d*(p)/D), column geometry (as l*/D) and flow speed (as R*e) have been performed.

[Determining the optimal fluorine dose in the drinking water of the South Center hydrological region of Haiti].

This study aims at determining the optimal dose of fluorine in the drinking water in the South Center region of Haiti. This region has an average daily temperature ranging from 17 to 33 C. Water samples were collected from November 15th to December 20th 2000 on the water resource of some of the counties of the hydrological South Center region of Haiti.