Abstract
Theresearch focus on using the aeration process as means for water recarbonationafter lime-soda softening. The results indicated that aeration efficientfor recarbonation of three water sampleswith different characteristics. The lime-soda softening increased the (pH)values of the three samples to reach(10.08,10.39,10.54) respectively. The aeration decreased these (pH) values to(8.26,8.36,8.23) respectively within (60)minutes. The depression was related tothe convert of the hydroxide and carbonate of the sample to the bicarbonateform by CO2 gas absorbed from the air bubbles. The absorptionefficiencies were (30.9,31.0,24.7)% for the three samples respectively. Theresearch also determined the value of (pH) at which the softened sample issaturated with calcium carbonate . These values for the three samples were (8.30,8.39,8.44) respectively. Accordingly the Langer saturationindex for each sample have a positive value. The samples is at supersaturation condition with calciumcarbonate for all samples. Therefore the aeration period needed to obtain thesaturation state at which the sample is stable was determined to be(58.8,59.1,55.2)minutes for the three samples respectively.
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