Study Of Singpolar Three-dimensional Electrode Reactor On De-Fluoride

Fluorine containing wastewater is a difficult in the current groundwater treatment. Fluorine adsorption is a primary method dealing with Fluorine-containing water. Since it is environment-friendly, high efficient, economical, it becomes a new research hot point. In this paper we adopt complex three-dimensional electrochemical reactor on de-fluoride. We use self-made hydrous zirconium oxide as three-dimensional particles for the purpose of selecting the optimal conditions to remove fluoride from the water and we study the reactor dynamics, the effect of different adsorption conditions on the adsorption, the wash and reuse of three-dimensional electrode particles. Moreover we research the changes of representation, the physical and chemical properties of three-dimensional particles before and after adsorption of fluorine.This research employs complex three-dimensional electrochemical fixed bed reactor which is a plug flow reactor of continuous flow reactor. Its hydraulic property fluctuates significantly when flow rate and the height of filled particles is changed. When the water flow rate SV= 5-8, the height of filling three-dimensional particles increases, it is in favor of adsorption of fluoride ions.From the study we conclude that the original condition of fluoride ions and process parameters impact the efficiency of fluorine adsorption significantly. When the original concentration of fluoride ions is low, the PH value is acidic and humic acid is low, the result of fluorine adsorption is obviously better. When the original condition of fluoride ions is fixed, the voltage, flow rate, height of filled particles and concentration of cathodic ions have the following impacts on fluorine adsorption:high voltage and low voltage are not conducive to fluorine adsorption, when voltage is 5V, the result of fluorine adsorption is the best; low SV value and high height of filled particles are in favor of fluorine adsorption; the concentration of cathodic ions has less influence. When electrode adsorbed fluorine, three-dimensional electrode particles surface becomes glossy, gap reduces, construction becomes loose and crystal lattice changes from regular to irregular.The adsorption of N2 of three-dimensional electrode particles and surface average aperture reduces when electrode adsorbed fluorine. The degree of reduction is different in various conditions. The adsorption quantity of N2 and surface average aperture decrease most when original water is acidic, humic acid is high, voltage is 5V, height of filled particles is high. The hydroxyl zirconium oxide material regenerates easily and the performance of adsorption dealt with 1M NaOH is equal to that of original material. The hydroxyl zirconium oxide material can be repeated used.Under the optimal conditions, using the three-dimensional electrode reactor for fluoride treatment of groundwater, the results show that the hydroxyl zirconium oxide material in the reactor has a good impact on fluoride groundwater and the effluent fluoride concentration of state water is up to the national standards.