TITLE:
Kinetic and Thermodynamic Study of the Dephosphation of Wastewater by Clay Materials from Côte d’Ivoire
AUTHORS:
Ake Ake Pierre, Kedi Atolé Brice, Coulibaly Vamoussa
KEYWORDS:
Adsorption, Clay, Phosphate, Eutrophication, Wastewater, Kinetic, Isotherm
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.11 No.12,
December
30,
2021
ABSTRACT: Phosphorus is introduced into the aquatic environment from different
point sources, mainly by domestic and industrial wastewater; contributing to
the eutrophication of water bodies. The most common way for
wastewater dephosphation is the injection of expensive chemicals into these
bodies of water. Thus, the main objective of
this work was to find an alternative to chemicals by using
clay materials from Côte d’Ivoire to adsorb phosphate ions
from aqueous solutions. The clay samples, taken from various regions were
characterized by X-ray diffraction. They have a different mineralogical
composition. The influence of various parameters such as the pH of the medium,
contact time, the ion force, temperature, etc. on the adsorption was studied.
Adsorption is influenced by the temperature, the pH of the medium, valence of
the saturated cation and the clay composition. It is described by a kinetic
model of the pseudo-second order. The salt of the medium has no
significant effect on the process. The thermodynamic study
revealed that adsorption is spontaneous, endothermic and that it is done by
electrostatic means of physical nature.