The Migration Mechanism Of Fluorine In The Soil - Water System Fluoride Water Treatment Research

Behavior characteristics of the fluorin, which is one of the substances caused great affect for environment and human health in the soil and water system, togather with its controling factors are studied with combining a methodolody the static state experiments with dynamic state experiments, the fluorine ion of the soil and water system moves and changes the transforms , the form changes, the substance interchanges pattern and feature and mechanism between the liquid phase and solid phase are researched. Mechanism of distribution characteristics of fluorine in soil profile and in the crops are revealed. The relationship between soil fluorine content or speciation variation of fluorine or adsorption forms in the soil and water system, and between variations of pH and Eh of soil solution and the unsaturated character of soil moisture along soil adsorbing fluorine from soil solution, are found by the writer. the relationship between the dissolution and the precipitation of CaCO3 or CaF2 controlls the concentration of fluorine in soil, but the relationship between the adsorption and pH of soil solution controlls the concentration under that the soil solution concentration of fluorine less than its critical concentration of the precipitation , The dominantly control the concentration of soil solution, are preliminarily established, that is about 10-6 (pH=8.5) ~10-2mol/L (Ph=4.5). The methods of Removing fluorine ion are put forward based on ion exchange and adsorption principle , separated the liquid and solid phase, Moreover two kinds of new defluoridation material are prepared, the Experiment shows that both of the defluoridation material have a high defluoridation capability, with activated Fe(III)-R resin being 14mg/g and Fe(III)-Y zeolite molecular sieve being more than 29mg/g , The two kind of new defluoridation materials have high choice for fluorine, their defluoridation effect are good by more eluting and regenerating. combining experiment results, mechanism of the two kind of new defluoridation material is discussed. Established and validated the mathematical former of defluoridation process of two kinds of defluoridation materials , the resultes settled theoretic fundation for embedded defluoridation reseach.