Use of calcium/iron oxide composites for sorption of phosphorus from wastewater
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Kuupäev
2023
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
The development of an effective, low-cost and natural sorbent is of great significance
for phosphorus removal and recovery from small and medium size industrial and municipal
wastewater. Commonly used phosphorus removal methods are costly and thus rarely applied in
the small-scale WWTPs. This research was aimed at preparing and characterising three different
calcium/iron composites for evaluating their sorption performance for the removal of phosphorus
from aqueous solutions and domestic wastewater. The obtained composite materials belonging
to the Brownmillerite mineralogical subgroup were characterised by the Powder X-ray
Diffraction (PXRD), specific surface area analysis by Brunauer-Emmett-Teller (BET) method
and scanning electron microscope (SEM). It was found that for aqueous solutions the sorption
process is pH- dependent, showing the optimal sorption conditions for phosphorus removal at pH
3 to pH 6. However, all three proposed composites significantly increased the pH of wastewater.
All three tested materials adsorbed phosphorus from wastewater. Maximal phosphorus adsorption
capacity from the domestic wastewater was 17.75 mg g-1
, 8.25 mg g-1 and 4.46 mg g-1 for
CaFeOxide, CaFeHydr and CaFeReg respectively. In further research it is planned to develop an
environmentally friendly and cost-effective phosphorus recovery technology with the potential
to apply the used sorbent as a slow-release fertiliser in agriculture.
Kirjeldus
Received: January 31st, 2023 ; Accepted: May 28th, 2023 ; Published: June 27th, 2023 ; Correspondence: ruta.ozola-davidane@lu.lv
Märksõnad
Brownmillerite, Srebrodolskite, natural inorganic sorbents, phosphorus removal, resource recovery, wastewater treatment, articles