A study of Phosphate Adsorption characteristics on different soils

Abstract

In this research, adsorption of Phosphate (p-Adsorption) on Black cotton Soil and Red soil has been studied through using batch adsorption techniques. Main objectives of this study are, to study the physical properties of Black cotton soil and Red soil, detection of Phosphate removal by adsorbent as a function of contact time, adsorbent dosage and pH, to study sorption kinetics, to study column tracer experiment and isothermal pattern. The results of this study showed that the Optimum contact time, dosage and pH for adsorption of Phosphate on Black cotton soil and Red soil reached to equilibrium after 55mins and 60mins, with removal efficiency of (86%), 1000mg and 1200mg (66% and 70%) as optimum dosages. Higher adsorption of Phosphate was observed at higher pH, obtained at pH 8.0 and 8.5, (62.5% and 64%). The rate of adsorption of Phosphate obeys first order rate equation. The obtained results of the batch and column experiments are best fit to Langmuir and Freundlich adsorption isotherms. From the experimental analysis it is concluded that Black cotton soil and Red soil shows good removal efficiency and hence can be used as adsorbents.