La mesure du pouvoir incrustant des eaux dures du Hamma et inhibition de l entartrage par Na2CO3 et KH2PO4

In calcareous soils, groundwater Hamma supplying the city of Constantine in drinking water are responsible inlarge concentrations of calcium bicarbonate. These waters have a total hardness of 57 ° F. During theirmovement, these waters give rise to the phenomenon of scaling in systems, which can lead to serious failures(clogging pipes, sticking stop devices, loss of efficiency of heat exchangers etc ...). Various methods ofdecarbonization as precipitation with lime or sodium carbonate or acid vaccination are commonly used. Somechemical inhibitors are sometimes added to block the germination of crystals of calcium carbonate. Our studyfocuses on the evaluation and inhibition of the scaling power of hard water of Hamma with chemical andelectrochemical methods in the presence of sodium carbonate and potassium dihydrogeno phosphate. Thestudy of the scaling curve gave an accelerated time scaling of 11.9min at 30°C and the increase in temperaturedecreases the value of time scaling. At an addition of 2 mg / L KH2PO4, 0.5g / L Na2CO3 the curve becomes astraight line, indicating the complete inhibition of scaling. For chemical tests the concentrations of 2.5mg/L ofKH2PO4 and 0.18g of Na2CO3 are sufficient to reduce the total hardness of water.