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Using Ca-Fe layered double hydroxide transformation to optimise phosphate removal from waste waters

Al Jaberi, Muayad; Mallet, Martine; Greenwell, H. Chris; Abdelmoula, Mustapha; Ruby, Christian

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Authors

Muayad Al Jaberi

Martine Mallet

Mustapha Abdelmoula

Christian Ruby



Abstract

Single phase CaFe layered double hydroxide (LDH) minerals containing Cl− species in the interlayer was synthesized by coprecipitation with a CaII: FeIII ratio of 2: 1. In both phosphate (PO4) free water and at low aqueous PO4 concentration, the LDH was fully transformed into a mixture of a “ferrihydrite-like” material, calcite and soluble calcium species. Mössbauer spectroscopy and transmission electron microscopy showed that phosphate was removed by the “ferrihydrite like” phase that contained a significant quantity of Ca. At high phosphate concentration the Ca species released from the LDH precipitated to form hydroxyapatite leading to a maximal removal capacity of ~ 130 mg P-PO4 g−1. The CaFe LDH was deposited onto a pozzolana volcanic rock in order to perform a column experiment under hydrodynamic conditions for 70 days. A high removal capacity was observed, a qB of ~ 4 mg P-PO4 g−1 was measured at the breakthrough of the column, however the pH in the outflow was measured to be higher than 11. Such an increase was due to the very high solubility of the CaFe LDH.

Citation

Al Jaberi, M., Mallet, M., Greenwell, H. C., Abdelmoula, M., & Ruby, C. (2019). Using Ca-Fe layered double hydroxide transformation to optimise phosphate removal from waste waters. Applied Clay Science, 182, Article 105281. https://doi.org/10.1016/j.clay.2019.105281

Journal Article Type Article
Acceptance Date Aug 25, 2019
Online Publication Date Sep 6, 2019
Publication Date Dec 1, 2019
Deposit Date Sep 3, 2019
Publicly Available Date Sep 6, 2020
Journal Applied Clay Science
Print ISSN 0169-1317
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 182
Article Number 105281
DOI https://doi.org/10.1016/j.clay.2019.105281
Publisher URL https://www.sciencedirect.com/journal/applied-clay-science

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