Abstract
Amorphous silica (AS) was obtained by acid decomposition of nepheline and characterized by the BET and BJH methods. It was found that the material has a predominantly mesoporous structure with cylindrical and wedge-shaped pores and a specific surface area of ~195 m2/g. The process of phosphate ion sorption by the synthesized sample was studied. The experimental data were processed using the sorption equations by Freundlich and Langmuir, which demonstrated that the sorption process is described quite reliably by both equations, while the Langmuir monomolecular adsorption equation is to be preferred in calculations. Adsorbed monolayer capacity of the synthesized sample with respect to PO43- ion and the adsorption equilibrium constant were found. Based on the data obtained, various sorption treatments of municipal wastewater were assessed allowing to bring PO43- ion to the threshold values adopted in the Russian Federation when discharging treated water into oligotrophic water bodies. The number of wastewater treatment stages required for the maximum phosphorus recovery was found.
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