Effects of operating conditions on the removal of heavy metals by zeolite in fixed bed reactors

V.J. Inglezakis, H. Grigoropoulou

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

This work investigates the effects of flow rate (5–15 Bed Volumes/h), particle size (0.8–1.7 mm), concentration (0.005–0.02 N) and Na+-enrichment of natural clinoptilolite on the removal efficiency of Pb2+, Cu2+, Fe3+ and Cr3+ in aqueous solutions. Ion exchange is performed in an upflow fixed bed reactor. The removal efficiency is increased with decreasing flow rate, particle size and concentration and is improved by a factor of 2–10, depending on the specific metal. The modification of the natural sample is favorable, leading to an increase of removal efficiency by 32–100%. For the experimental conditions examined, removal efficiency order is the following: Pb2+>Cr3+>Fe3+≥Cu2+. Finally, the operation is influenced by the studied parameters, following the order: concentration>volumetric flow rate>particlesize>modification of the material.
Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalJournal of Hazardous Materials
Volume112
Issue number1-2
DOIs
Publication statusPublished - 9 Aug 2004

Keywords

  • heavy metals
  • clinoptilolite
  • fixed bed
  • ion exchenge
  • selectivity

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