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Electrokinetic Remediation of Fluorine-contaminated Soils

Author: ZuoChunLi
Tutor: ZhuShuFa
School: Henan University of Science and Technology
Course: Chemical processes
Keywords: Electrodynamics Fluorine Soil pollution Repair
CLC: X53
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 0
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Abstract


Fluoride is inorganic pollutants, one of the environmental pollutants. Fluoride and human health is closely related to too much or too little intake of fluoride, are detrimental to human health, harm. With industrial development, industrial \Fluoride pollutants in soil research electrokinetic remediation technology has a very important practical significance. This paper first introduces the contaminated soil remediation technology status, discussed the kaolin adsorption and desorption of the law, electrodynamics methods to study the factors that affect electric repair fluoride contaminated soil, and strive to find the best electric repair conditions. Fluoride contaminated soil electrical remediation to discuss the impact of factors including the four different length of the soil column, different electrolysis time, different electrolysis voltage and different electrolyte part of the experiment, and to collect data, calculate the pollutant removal efficiency of the fluoride, according to experimental results of the comprehensive evaluation of various indicators. The main conclusions of the paper include: 1. Kaolin adsorption and desorption has to follow the law. Extended adsorption time, reduce the concentration of fluoride solution, adjust pH to neutral kaolin adsorption rate of fluoride increases; extend desorption time increases kaolin on the desorption of fluorine desorption rate, pH, concentration of lye minimal. 2. Electric fluorine contaminated soil remediation experiments to study the impact of the various conditions of the experiment, found electrodynamics technique to repair fluoride contaminated soil is a convenient and a good way to safety, saving time and effort. Fluoride contaminant removal, the removal efficiency of 79%, indicating that this method is feasible. 3 in the electrokinetic remediation experiments, select 10cm long soil column experiment good effect, and the appropriate length; restoration time should be selected according to experiments, when the experiment by a current value of the soil is very low, and does not change for a long time, should stop the experiment, the current is too weak effect of up to less than the removal to continue only energy-consuming Processed; electrolysis voltage increases, there is conducive to the removal of pollutants in the soil, can be obtained by the test, in 2.0V/cm voltage electrodynamics highest removal efficiency of the recovery of fluorine contaminated soil; the selection of the electrolyte is also electrically kinetic experiments the key, which has a great influence on the removal of the effect, after experimental verification, the anolyte with 0.05mol / L NaOH solution can not only efficiently remove soil fluorine, and resource conservation.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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