Contribution to the study of the phenomenon of scaling of pipes by groundwater in the region of Tahoua: Study of the variation of the concentration of pure calco-carbonic solutions

Groundwater of some localities in Thaoua region are charged in hydrogen carbonate ions and calcium. During their exploitation these waters essentially form adhesive CaCO3 deposits on the partitions of facilities transporting theme: This phenomenon corresponds to what is called scaling. To understand this phenomenon kinetics of precipitation of the CaCO3 while using of the controlled degassing method were studied. This method consists striping the CO2 of the solution while stealing air and the CaCO3 hurls down. So a set of tests has been done from the pure calco-carbonic solutions to varied concentrations. The kinetics has been followed while measuring it [Ca2+] and the pH of the solution according to the time. The time of germination has been marked with the simultaneous fall of the pH and it [Ca2+]. The leading principle of precipitation CaCO3 and the elimination CO2 of the solution. In short the more water contains calcium the more it is scaling and the time of germination decreases with the concentration in calcium, we continued this survey while varying the temperature, flow of air etc