Enhanced coagulation using Al/Fe(iii) coagulants: effect of coagulant chemistry on the removal of colour-causing NOM

J.-Q. Jiang*, N. J.D. Graham

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

The addition of excess coagulant and lowering the coagulation pH in order to improve the removal of NOM and DBP precursors have been defined as ‘enhanced coagulation’. However, as a consequence, sludge production and treatment costs are increased, and the chemical storage and feed facilities need to be changed. Through developments in coagulant chemistry, various types of pre-polymerised coagulants have been prepared in recent years and been applied widely. In comparison to conventional coagulants under such ‘enhanced coagulation’ conditions, pre-polymerised coagulants can improve NOM and THMFP removals at relatively lower dosages. In addition, this results in a reduction in the sludge production and treatment costs, and the existing facilities in a water treatment works need not be changed by the use of pre-polymerised coagulants.

Original languageEnglish
Pages (from-to)937-950
Number of pages14
JournalEnvironmental Technology (United Kingdom)
Volume17
Issue number9
DOIs
Publication statusPublished - Sep 1996
Externally publishedYes

Keywords

  • Enhanced coagulation
  • poly-aluminium coagulants
  • poly-ferric coagulants
  • natural organic matter (NOM)
  • trihalomethane formation potential (THMFP)
  • sludge production

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

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