USE OF CHRONOAMPEROMETRY FOR THE INHIBITION OF SCALING IN HARD WATERS

The formation of scale on the surface of the drinking-water pipes in industrial plants or leads to clogging of pipes and causes a decrease in heat transfer. Several methods of assessing hard water scaling power exist, but the most commonly used to slow the formation of deposit of calcium carbonate is to additions of chemical inhibit or sat low concentrations in water encrusting. In this work we used the electrochemical technique of chronoamperometry imposed potential that determines the evolution of the reduction current of oxygen through the electrode as a function of time in the absence and presence of inorganic phosphate (K2HPO4 and K3PO4) that an additional water Fourchi. According to the study chronoamperometric, Fourchi raw water is characterized by scaling time (t(E)) which is an index of 23.5min and scaling (le = 42.5). Thus, we can classify the water of Fourchi is very scale-forming. In the presence of inhibitors, the risk of scaling is reduced. The time scaling and the residual current increase with the addition of inhibitors and the effective concentration for the inhibition of calcification of the water Fourchi is 3.5mg/L for K2HPO4 and 2mg/L for K3PO4.