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Research article - Peer-reviewed, 2013

Modeling phosphate transport and removal in a compact bed filled with a mineral-based sorbent for domestic wastewater treatment

Herrmann, Inga; Jourak, Amir; Gustafsson, Jon-Petter; Hedström, Annelie; Lundström, T Staffan; Viklander, Maria

Abstract

Phosphorus filter units containing mineral-based sorbents with a high phosphate (PO4) binding capacity have been shown to be appropriate for removing PO4 in the treatment of domestic wastewater in on-site facilities. However, a better understanding of their PO4 removal mechanisms, and reactions that could lead to the formation of PO4 compounds, is required to evaluate the potential utility of candidate sorbents. Models based on data obtained from laboratory-scale experiments with columns of selected materials can be valuable for acquiring such understanding. Thus, in this study the transport and removal of PO4 in experiments with a laboratory-scale column filled with a commercial silicate-based sorbent were modeled, using the hydro-geochemical transport code PHREEQC. The resulting models, that incorporated the dissolution of calcite, kinetic constrains for the dissolution of calcium oxide (CaO) and wollastonite (CaSiO3), and the precipitation of amorphous tricalcium phosphate, Ca-3(PO4)(2), successfully simulated the removal of PO4 observed in the experiments. (C) 2013 Elsevier B.V. All rights reserved.

Keywords

Reactive transport modeling; On-site wastewater treatment; Filtration; PHREEQC; Constructed wetlands; Phosphorus

Published in

Journal of Contaminant Hydrology
2013, Volume: 154, pages: 70-77
Publisher: ELSEVIER SCIENCE BV

    SLU Authors

    Sustainable Development Goals

    SDG6 Clean water and sanitation
    SDG3 Good health and well-being

    UKÄ Subject classification

    Other Environmental Engineering
    Geochemistry

    Publication Identifiers

    DOI: https://doi.org/10.1016/j.jconhyd.2013.08.007

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/51208