A comparison of zeta potentials and coagulation behaviors of cyanobacteria and algae

Tugrul Selami Aktas, Fumihiko Takeda, Chikako Maruo, Nobuo Chiba, Osamu Nishimura

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this study, the zeta potential of Microcystis aeruginosa (cyanobacteria), Synechococcus sp. (picocyanobacteria) and Chlorella vulgaris (algae) was investigated in order to determine the zeta potential range for optimum cell removal. Algae and cyanobacteria species were treated by coagulation-sedimentation using 0-500 mg/l polyaluminum chloride (PACl). Analyses included zeta potential measurement, cell counts and turbidity removal. The role of pH on the zeta potential also investigated in this study. The pH of coagulation system was adjusted to pH 6.5 and 7.0. At pH 6.5, the optimum zeta potential bands were between -2.1 mV and +20.45 mV for Microcystis aeruginosa, +3.45 mV and +8.71 mV for Chlorella vulgaris and +7.41 mV and +13.33 mV for Synechococcus sp. The ranges were much narrower at pH 7 than at pH 6.5. The cell removal efficiencies were 98.9%, 90.6% and 55.7% for Microcystis aeruginosa, Chlorella vulgaris and Synechococcus sp, respectively. The implications of such findings are that the charge measurement can be used for controlling coagulation of algae and cyanobacteria. In addition, the type of cell species in the system was shown to a significant factor in the coagulation performance.

Original languageEnglish
Pages (from-to)294-301
Number of pages8
JournalDesalination and Water Treatment
Volume48
Issue number1-3
DOIs
Publication statusPublished - 2012 Dec 3

Keywords

  • Algae
  • Coagulation
  • Cyanobacteria
  • Turbidity
  • Zeta potential

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

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