Sorption of phosphate from acidic wastewater into three Tunisian type clay soils

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Abstract
The removal of phosphates from acidic wastewater using three types of soil minerals (Soil 1, Soil 2, and Soil 3) with a high content of paligorskite, smectite, and illite, respectively, is studied. The effect of the medium pH value, contact duration, and solid-liquid ratio is considered. The smectite-containing soil possesses the highest sorption capacity with respect to phosphate. The isotherms of phosphate sorption by soils are processed in the Freundlich and Langmuir equation coordinates. It is shown that the fitting of isotherms in the Freundlich equation coordinates results in better correspondence with experimental data. In addition, the adsorption selectivity of ions (PO4 3−, F−, Cl−) existing in the waste solution by these soils was studied, and the fluoride is more selective in the acid pH region.

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