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Journal Article

Chloride Removal from Recycled Cooling Water Using Ultra-High Lime with Aluminum Process

Ahmed Abdel-Wahab and Bill Batchelor
Water Environment Research
Vol. 74, No. 3 (May - Jun., 2002), pp. 256-263
Stable URL: http:/stable/25045603
Page Count: 8
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Chloride Removal from Recycled Cooling Water Using Ultra-High Lime with Aluminum Process
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Abstract

Chloride is a deleterious ionic species in cooling water systems because it promotes corrosion, and most of the scale and corrosion inhibitors are sensitive to chloride concentration in the water. Chloride can be removed from cooling water by precipitation as calcium chloroaluminate [${\rm Ca}_{4}{\rm Al}_{2}{\rm Cl}_{2}({\rm OH})_{12}$]. A set of equilibrium experiments and one kinetic experiment were conducted to evaluate chloride removal using the ultra-high lime with aluminum (UHLA) process and to characterize the equilibrium conditions of calcium chloroaluminate precipitation. A total of 48 batch-equilibrium experiments were conducted on a 30 mM NaCl solution over a range of values for lime dose (0 to 200 mM) and sodium aluminate dose (0 to 100 mM). Experimental results showed that the UHLA process can remove chloride and that the formation of a calcium chloroaluminate solid phase is a reasonable mechanism that is able to adequately describe experimental results. An average value of the ion activity product of $10^{-94.75}$ was obtained and can be used as an estimate of the solubility product for ${\rm Ca}_{4}{\rm Al}_{2}{\rm Cl}_{2}({\rm OH})_{12}$.

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