Reusability of iron oxyhydroxide agglomerates adsorbent for repetitive phosphate removal

Hilla Shemer*, Ahmad Armush, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Phosphate release to receiving water bodies promotes eutrophication. Therefore it is a common practice to remove phosphate from domestic wastewater. Yet, the conventional secondary treatment most often require a polishing step as to comply with rigorous regulations. Semi-batch adsorption experiments demonstrated the feasibility of phosphate removal, from synthetic secondary effluent, by adsorption onto iron oxyhydroxide agglomerates (IOAs) in a submerged membrane reactor. Sedimentation of the IOAs, their regeneration and reusability were investigated. Additionally, the reuse of the desorbing solution was examined. Techno-economic evaluation of the cost of chemicals required for synthesis and regeneration of the IOAs is presented. The potential application of the IOAs as a renewable adsorbent was demonstrated by the high adsorption capacity which was not significantly changed with the adsorption/regeneration cycle number (about 93% of initial adsorption capacity was obtained in the fifth adsorption cycle) as well as the lower chemical cost of IOAs regeneration as compared to their synthesis.

Original languageEnglish
Article number123680
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume579
DOIs
StatePublished - 20 Oct 2019
Externally publishedYes

Keywords

  • Adsorption
  • Desorption
  • Phosphorous
  • Secondary effluent
  • Submerged membrane reactor

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