Modelling of the closed equilibrium system H2O–(CO2)W–CaCO3–NaH2PO4 for wastewater treatment applications

Modelling of the closed equilibrium system H2O–(CO2)W–CaCO3–NaH2PO4 for wastewater treatment applications

Water pollution caused by nitrogen and phosphorus compounds triggers algal blooms and poses challenges to aquatic organisms. Wastewater treatment ap plications represent critical areas where fundamental models of phosphorus equilibria, prevalent in municipal and reject water streams, are essential....

Full description

Saved in:
Bibliographic Details
Main Authors: Ivar Zekker, Oleg Artemchuk, Ergo Rikmann, Kalev Uiga, Laura Daija, Faysal-Al Mamun, Andrejs E. Krauklis, Ruta Ozola-Davidane, Taavo Tenno, Toomas Tenno†
Format: Article
Language:English
Published: Estonian Academy Publishers 2025-01-01
Series:Proceedings of the Estonian Academy of Sciences
Subjects:
proton transfer model
equilibrium system of h2o–co2–caco3–nah2po4
carbonate equilibrium
phosphate equilibrium
Online Access:https://kirj.ee/wp-content/plugins/kirj/pub/proc-1-2025-15-22_20250115155219.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Water pollution caused by nitrogen and phosphorus compounds triggers algal blooms and poses challenges to aquatic organisms. Wastewater treatment ap plications represent critical areas where fundamental models of phosphorus equilibria, prevalent in municipal and reject water streams, are essential. This paper focuses on studying the closed equilibrium system H2Oâ(CO2)WâCaCO3âNaH2PO4, elucidating the structural distribution of ions and mol ecules within this system. Utilizing the iteration method, we calculate pH, concentrations of formed ions and molecules, and proton transfer parameters based on a developed proton transfer model. Upon the initial formation of the equilibrium system H2Oâ(CO2)WâCaCO3, CO32â ions released from the dis solution of CaCO3 bind protons (Î[H+]CO32â) originating from the reversible dissociation of water (Î[H+]H2O) and H2CO3 (Î[H+]H2CO3). In the equilibrium system H2Oâ(CO2)WâCaCO3âNaH2PO4, at low initial CO2 concentrations (< 3.39 à 10â5 mmol·Lâ1), the majority of protons (Î[H+]H2PO4â) originate from the H2PO4â dissociation. Conversely, with increased initial CO2 con centrations, the dissociation of H2CO3 (Î[H+]H2CO3) becomes the primary proton source. Experimental validation confirms the developed modelâs accuracy.
ISSN:1736-6046
1736-7530

Similar Items