Cellular proteins of Microcystis aeruginosa inhibiting coagulation with polyaluminum chloride

Tomoko Takaara, Daisuke Sano, Hiroshi Konno, Tatsuo Omura

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Cyanobacterial growth in semi-closed water areas such as reservoirs brings about a coagulation inhibition in a drinking water treatment system, but the inhibitory substances and mechanisms involved have yet to be elucidated. In this study, proteins having a high affinity with polyaluminum chloride (PACl) were isolated from organic substances produced by Microcystis aeruginosa with the affinity chromatography technique. Both extracellular organic matter (EOM) and cellular organic matter (COM) disturbed the flocculation of suspended kaolin with PACl, but it was likely that nonproteinous substances in EOM cause the reduction of coagulation effciency. In contrast, proteins in COM were obtained as possible inhibitory substances for the coagulation with PACl. These proteins could consume PACl in the coagulation process due to the formation of chelate complexes between these inhibitory proteins and the coagulant. The consumption of PACl by cyanobacterial proteins could be one of the important causes of the increase in coagulant demand.

Original languageEnglish
Pages (from-to)1653-1658
Number of pages6
JournalWater Research
Volume41
Issue number8
DOIs
Publication statusPublished - 2007 Apr

Keywords

  • Affinity chromatography
  • Coagulation
  • Cyanobacterial proteins
  • Microcystis aeruginosa
  • Polyaluminum chloride

ASJC Scopus subject areas

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

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