Charged Membrane Ultrafiltration of Toxic Metal Oxyanions and Cations from Single- and Multisalt Aqueous Solutions

D. Bhattacharyya, M. Moffitt, R. B. Grieves

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11 Scopus citations

Abstract

With application to the treatment of nonferrous metals production streams, the toxic metals As(V), Se(IV), As(III), and Cd(II) are separated from single-and multisalt aqueous solutions by continuous-flow, membrane ultrafiltration with charged, noncellulosic membranes. The single-salt aqueous solutions of As(V), Se(IV), As(III), or Cd(II) are investigated over pH 5 to 10, metal concentrations in the range 0.5 to 20.0 mM, and transmembrane pressure differences from 2.8 x 105 to 5.6 x 105 N/m2, with the effects of these three independent variables established on the metal rejections. The rejections of the monovalent oxyanions H2As04“, HSe03“, and H2As03~ (with sodium as the counterion) are of the order 0.85, and those of the divalent HAs04 2Se03 2~ (and S04 2-), and of Cd2+ are of the order 0.95 for 6.0 mM feed streams. Comparisons are made with the halides, N03“, andC104.The rejection behavior of multisalt solutions of H2As04 “and HSe03” is not influenced by the presence of sulfate, but Cd2+ produces a decrease in the rejection of Se(IV). For feed streams 2.0 mM each in H2As04“, HSe03, Cd2 +, and Zn2+ at pH 5, the presence of a high sulfate concentration does not affect the metal rejections, except at greater than 14.0 mM where the Se(IV) rejection begins to decline sharply.

Original languageEnglish
Pages (from-to)449-463
Number of pages15
JournalSeparation Science and Technology
Volume13
Issue number5
DOIs
StatePublished - Jan 1 1978

Bibliographical note

Funding Information:
The authors acknowledge gratefully the research support by the U.S. Environmental Protection Agency through Grant No. R804568-01 and

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Process Chemistry and Technology
  • Filtration and Separation

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