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.
Highlights
Phosphorus is an essential nutrient for all forms of life and cannot be replaced by other species
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 sorption of phosphorus onto marble dust was investigated by batch experiments, kinetic sorption model and isotherm model
Summary
Phosphorus is an essential nutrient for all forms of life and cannot be replaced by other species. Phosphorus is mostly obtained from mined rock phosphate and existing rock phosphate reserves could be exhausted in 50 100 years [1]. Phosphorus removal using natural materials as novel sorbents has been gaining increased attention. Several studies have reported on the using of natural materials to improve the phosphorus removal by sorption, including: limestone, shale, slag, iron rich gravel, zeolite, calcite and other artificial materials [2]. Adam et al, (2007) [3] reported that the shells and filtralite as natural materials were been tested for their phosphorus sorption capacity, both with batch and column experiments and found that the phosphorus removal rate of 92 and 91 was measured in the columns of shells and filtralite respectively, for the entire experimental period. It was reported that zeolite and pelleted clay, either alone orin combination with soils, alum, calcite and dolomite, was found to improve the phosphorus sorption capacity [4]
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