The Experiment And Simulation Study On Influence About The Adsorption Process Of Potassium Ferrate To Copper In Soil

As one of the most important energy and heavy industry bases in China, Shan Xi province is suffering from the seriously destructed environment caused by the straightforward development in recent years. Heavy industrial production, like mineral mining and metal smelting, increases the content of heavy metal in the soil arounding the factories. In order to prevent earth, plants and human lives from the threat of the heavy metals in soil, we have to devote ourselves to research the migration of heavy metals in soil and seek some efficient pollution-free methods to deal with heavy metals immediately.Understand and grasp the of heavy metal ions in soil, the changing law, effective and efficient pollution-free processing method of heavy metals, to improve the existing conditions was imminentThis paper creatively takes potassium ferrate, a new kind of environmental friendly agent which has been widely studied in the field of water treatment, to the adsorption and fixation of copper in soil, researches the action effects, and numerical simulates the action process. The purpose of this experiment is mainly to explore the resolution of Cu2+ in soil between the situations of the potassium ferrate is added in or not under the different natural conditions. This experiment also studies the migration patterns of Cu2+ in the soil and creates the numerical model of this process.This research mainly focuses on the following three aspects with the artificial polluted-soil:(1) The adsorption and disadsorption of soil to Cu2+ at different conditions(p H, temperature, initial moisture content of soil and initial copper content of soil);(2) Under the dynamic experiment, the adsorption of soil to the Cu2+ after joining potassium ferrate;(3) Comparison of the adsorption of soil to Cu2+ between the potassium ferrate is added or not.The conclusions:(1) Under natural conditions, the best adsorption condition analyzed from results is: pH =6.6, temperature T = 30℃, initial copper content of soil CCu = 500mg·kg-1, the initial moisture content of soil θ=15%. The influence degree of four factors on adsorption of soil to Cu2+ is: pH>temperature>initial copper content of soil> initial moisture content of soil.(2) pH is the very significant effect on soil adsorption of Cu2+, the amount of adsorpted Cu2+ increases with the growth of pH. The temperature is the significant effect on soil adsorption of Cu2+, the amount of adsorpted Cu2+ increases with the growth of temperature. Initial moisture content of soil and the copper content of soil are not significant. The best initial moisture content of soil is 15% and the best initial copper content of soil is 500 mg·kg-1.(3) Under natural conditions, the best adsorption time of soil to Cu2+ is 5 hours.(4) After joining K2FeO4, the best adsorption condition analyzed from results is: pH =10, temperature T=20℃, the initial moisture content of soil θ=15%, the initial copper content of soil CCu2+= mg·kg-1. The influence degree of five factors on adsorption of soil to Cu2+ is: p H> content of Fe6+> initial moisture content of soil >temperature>initial copper content of soil.(5) The best concentration of Fe6+ is 100 mg·L-1.(6) After adding potassium ferrate, pH is very significant effect on soil adsorption of Cu2+. The amount of adsorpted Cu2+ can increases with the growth of temperature up to 98.78%.(7) After adding potassium ferrate, the higher temperature is effective to the Cu2+ fixation at the surface of soil and the lower temperature is effective to the Cu2+ fixation at the deepth of soil. During the experiment, the best temperature for adsorption at the depth of 5cm is 30℃, and the best temperature for adsorption at the depth of 15 cm and 25 cm is 20℃.(8) Potassium ferrate greatly improves the stability of adsorption of soil to Cu2+, reduces the desorption amount of Cu2+ in soil. Without the potassium ferrate, the biggest desorption quantity of soil is 0.3573 and the smallest desorption amount of soil is 0.1799. With potassium ferrate added, the biggest desorption quantity of soil is 0.1441 and the smallest desorption quantity of soil is 0.0247.(9) After adding potassium ferrate, the conditions for the smallest disadsorption is: pH =6.6, temperature T=20℃, initial copper content of soil CCu = 100mg·kg-1, the initial moisture content of soil θ=15%.(10)CDE model can simulate the one-dimensional migration of Cu2+ in soil very well.