Surface-retained organic matter of Microcystis aeruginosa inhibiting coagulation with polyaluminum chloride in drinking water treatment

Tomoko Takaara, Daisuke Sano, Yoshifumi Masago, Tatsuo Omura

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Algogenic organic matter produced by the excess growth of cyanobacteria in semi-closed water areas causes coagulation inhibition in drinking water production. In this study, hydrophilic substances of Microcystis aeruginosa, which were mainly composed of lipopolysaccharide (LPS) and RNA, were prepared, and the involvement of these cyanobacterial hydrophilic substances in coagulation inhibition was investigated. As a result, it was found that the negatively charged hydrophilic substances with a molecular weight higher than 10 kDa have a significant role in coagulation inhibition. Further fractionation of cyanobacterial hydrophilic substances revealed that surface-retained organic matter (SOM), including LPS, could exhibit a potent inhibitory effect on the coagulation using polyaluminum chloride (PACl), presumably because of the direct interaction of hydrophilic SOM with cations originated from PACl, which could impede the hydrolysis of the coagulant.

Original languageEnglish
Pages (from-to)3781-3786
Number of pages6
JournalWater Research
Volume44
Issue number13
DOIs
Publication statusPublished - 2010 Jul

Keywords

  • Coagulation inhibition
  • Lipopolysaccharide (LPS)
  • Microcystis aeruginosa
  • Polyaluminum chloride (PACl)
  • Surface-retained organic matter (SOM)

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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