Evaluating alternative aluminium sources for chloride removal from recycled cooling water

Ahmed Abdel-Wahab, Bill Batchelor

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)234-243
Number of pages10
JournalInternational Journal of Environmental Technology and Management
Volume16
Issue number3
DOIs
Publication statusPublished - 1 Jan 2013
Externally publishedYes

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Keywords

  • Aluminium
  • Calcium chloroaluminate
  • Chloride
  • Cooling water
  • Lime softening
  • pH
  • Solid solution
  • Water recycle

ASJC Scopus subject areas

  • Environmental Engineering
  • Management, Monitoring, Policy and Law

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