Removal of divalent heavy metal mixtures from water by Saccharomyces Cerevisiae using crossflow microfiltration

BAYHAN Y. K., Keskinler B., Çakici A., Levent M., Akay G.

Water Research, vol.35, no.9, pp.2191-2200, 2001 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 9
  • Publication Date: 2001
  • Doi Number: 10.1016/s0043-1354(00)00499-1
  • Journal Name: Water Research
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2191-2200
  • Keywords: Crossflow microfiltration, Heavy metals, Sacharomyces cerevisiae, Wastewater treatment
  • Uşak University Affiliated: No

Abstract

The removal of heavy metal ions, Ni2+, Cu2+ and Pb2+ using yeast (Saccharomyces cerevisiae) as carriers in a crossflow microfiltration is investigated. The effects of yeast cell and electrolyte concentrations on the transient and steady-state permeate flux and metal ion rejections are established. It is found that the metal ion rejection reaches a plateau if yeast cell concentration is greater than ∼2g/l as a result of cell aggregation. The binding affinity of the metals to yeast cell is Pb2+ > Cu2+ > Ni2+, which is also reflected in the metal ion rejection under identical process conditions. Because of the formation of yeast cell flocks in the presence of Pb2+, permeate flux is also higher for this metal. The presence of NaCl decreases both rejection and permeate flux for Ni2+ and Cu2+ but not for Pb2+. When binary or ternary metal mixtures are used, the rejection of the individual metals is reduced except that of Pb2+. It is found that the pseudo-gel concentration is unaffected by the presence of metal ions. Copyright © 2001 Elsevier Science Ltd.