Phosphorus Removal from Aqueous Solutions by Bentonite: Effect of Al2O3 Addition

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Phosphorus Removal from Aqueous Solutions by Bentonite: Effect of Al2O3 Addition

Original Article, C47
Panahi Osalo T, MerufiniaE, Esmat Saatlo M.
Journal. Civil Eng. Urban. 3(5):317-322. 2013

ABSTRACT:Phosphorus is the main nutrient responsible for eutrophication of aquatic ecosystems; therefore, it is important to develop new processes to remove phosphorus from aqueous solutions. In this research, performance, kinetics, and adsorbing isotherms of Bentonite and Bentonite- Alumina compound (10% Alumina (Al₂O₃), 90% Bentonite) were investigated. According to the results of this study, the Langmuir adsorption model was best to describe adsorption equilibrium data for Bentonite-Alumina mixture and Bentonite (r²=0.999 for Bentonite-Alumina mixture and r²=0.996 for Bentonite). The Langmuir Isotherm parameters for Bentonite and Bentonite-Alumina were Q_m=15.2, 18.1 mg/g and K=4.3, 5.5 L/mg, respectively. Moreover, the Freundlich Isotherm parameters were K=6.6, 9.12 and n=3.05, 3.7, respectively. Bentonite-Alumina mixture was found to more effective for the removal of phosphorus than Bentonite (97% in 140 min in comparison to 90% in 140 min).
Keywords:Phosphorous Removal, Absorbents, Bentonite, Alumina, Algae, Eutrophication

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