Evaluating alternative aluminium 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 aluminium 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 scaleforming compounds. The purpose of this paper is to evaluate alternative aluminium sources for chloride removal from recycled cooling water using UHLA process. Three aluminium sources (freshly precipitated aluminium hydroxide (Al(OH)3), waste alum sludge, and sodium aluminate (NaAlO2)) were used. Results of lab experiments indicated that at low aluminium doses, chloride removal is similar for all three aluminium sources. However, at high aluminium doses, chloride removal efficiency was higher with Al(OH)3 than with NaAlO 2 or alum sludge at the same lime dose. Much of the differences among them could be attributed to differences in pH. Copyright 2013 Inderscience Enterprises Ltd.
International Journal of Environmental Technology and Management
author list (cited authors)
Wahab, A. A., & Batchelor, B.
complete list of authors
Wahab, Ahmed Abdel||Batchelor, Bill