Design, production and characterisation of granular adsorbent material for arsenic removal from contaminated wastewater

Chirangano Mangwandi, Siti Nur Ain Suhaimi, Jiang T. Liu, Ranjit M. Dhenge, Ahmad B. Albadarin

Research output: Contribution to journalArticle

10 Citations (Scopus)
285 Downloads (Pure)


The objective of this research was to design granulated iron oxide for the adsorption of heavy metals from wastewater. Polyvinyl acetate (PVAc) was chosen as a suitable binder; as it is water insoluble. Initial experiments on selection of suitable solvent of the polymer were carried out using three solvents namely; methanol, acetone and toluene. Based on the initial tests on product yield and mechanical strength, acetone was selected as the solvent for the polyvinyl acetate binder. Design of experiment was then used to investigate the influence of granulation process variables; impeller speed, binder concentration and liquid to solid ratio on the properties of the granular materials. The response variables in the study were granules mean size, stability in water and granule strength. The results showed that the combination of high impeller speed and high binder concentration favour the formation of strong and stable granules. Results also showed that leaching of the binder into the simulated was water was negligible. Trial adsorption experiments carried out using the strongest and most stable iron oxide granules produced in this work showed removal efficiency of around 70% of synthetic arsenic solutions with initial concentration of 1000 ppb.
Original languageEnglish
Pages (from-to)70-81
JournalChemical Engineering Research and Design
Early online date08 Apr 2016
Publication statusPublished - Jun 2016


  • high shear granulation
  • Adsorption
  • Arsenic removal
  • stability

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry (miscellaneous)
  • Environmental Science(all)

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