No abstract

The removal of phosphorus from water using marble dust as sorbent material was studied by conducting batch tests, kinetic sorption model and isotherm model. The kinetic sorption model based on a pseudo equation was applied to predict the rate constant of sorption. Thorough investigations to understand the mechanism of phosphorus sorption onto the marble dust using kinetic sorption models, pseudo first order and pseudo second order kinetic sorption models showed that the kinetic sorption is consistent with the second order model, from which it can be inferred that the mechanism of sorption is chemisorption. The Langmuir and Freundlich isotherm models were applied to describe the equilibrium isotherms. The results of isotherm models showed that the Langmuir isotherm agrees very well with the experimental data compare with Freundlich isotherm. Batch tests and kinetic sorption models results showed that using the marble dust as sorbent material could be remove more than 94.3% of phosphorus from water.

The study investigates the capacity of different soils and byproduct materials on removal of phosphorus from water. The aim of this study has been drawn to gain a product rich in phosphorus, which can be recycled by the phosphorus industry or may directly be used as a fertilizer. For the development of this phosphorus removal and recovery method, batch and column experiments were carried out in the laboratory scale to evaluate the removal of phosphorus from water under dynamic conditions. Three columns were filled with mixed soils and marble dust and loaded with a phosphorus solution 100 mg/l concentration. The results showed that using the marble dust as adsorbent among other materials could be removing more than 93% of phosphorus from aqueous solution.