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EVALUATING ALTERNATIVE ALUMINUM SOURCES FOR CHLORIDE REMOVAL FROM RECYCLED COOLING WATER

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Chloride is important in promoting corrosion in cooling water systems, which leads to reducing the efficiency of heat transfer surfaces and shortening equipment life. Ultra-high lime with aluminum process (UHLA) is a potential new technology that has the ability to remove chloride and sulfate from recycled cooling water in addition to removing the majority of scale-forming compounds. The purpose of this paper is to evaluate alternative aluminum sources for chloride removal from recycled cooling water using UHLA treatment process. Three aluminum sources (freshly precipitated aluminum hydroxide (Al(OH)3(s)), waste alum sludge, and sodium aluminate (NaAlO2)) were used. Results of lab experiments indicated that at low aluminum doses, chloride removal is similar for all three aluminum sources. However, at high aluminum doses, chloride removal efficiency was higher with Al(OH)3 than with NaAlO2 or alum sludge at the same lime dose. Much of the differences among them could be attributed to differences in pH.
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Document Type: Research Article

Publication date: 01 January 2005

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