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

Sammanfattning

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.

Nyckelord

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

Publicerad i

Journal of Contaminant Hydrology
2013, volym: 154, sidor: 70-77
Utgivare: ELSEVIER SCIENCE BV

SLU författare

• Gustafsson, Jon-Petter

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    

Globala målen (SDG)

SDG3 God hälsa och välbefinnande
SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Annan naturresursteknik
Geokemi

Publikationens identifierare

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

Permanent länk till denna sida (URI)

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