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Citation: Li Yanni, Liu Shan, Luo Zhaohui, Jin Xiaowen. Experimental Study on Dynamic De-fluorination with Limestone in Electric Field[J]. Chemistry, ;2019, 82(2): 163-168. shu

Experimental Study on Dynamic De-fluorination with Limestone in Electric Field

Li Yanni ¹ ,
Liu Shan ^2,, ,
Luo Zhaohui ² ,
Jin Xiaowen ³

1.
China Hydrogen and Oxygen Testing & Certification Co. Ltd, Wuhan 430205
2.
School of Environmental Science and Engineering, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003
3.
China University of Geosciences, Wuhan 430074

Corresponding author: Liu Shan, 2040743@hbpu.edu.cn
Received Date: 28 January 2018
Accepted Date: 24 July 2018

Figures(7)

High fluoride groundwater de-fluorination is one of the most effective methods to ensure local residents away from endemically fluorine diseases. A new type of sealing de-fluorination device was used to find out the driving force, influence factors and de-fluorination ability of dynamic de-fluorination with limestone in electric field. The results showed that the fluorine could be degraded and the fluorite would be over formed as the reacting between limestone and high fluoride water in electric field. The whole process could be divided into initialization phase and stabilization phase. Furthermore, the voltage gradient is the main factor of the de-fluorination. The ability of de-fluorination would increase if the voltage gradient is over 4.8V/cm. During the process, the concentration of F^- would enrich at anode and CaF₂ would be formatted at cathode, which indicate de-fluorination will be better at cathode. Also, the configuration of limestone surface varied much and corrosion could be observed clearly. When the voltage was 24 V and distance between electrodes was 3cm, the concentration of fluoride at cathode decreased to the nation sanitary standard for drinking water quickly.
- High fluoride water,
- De-fluorination,
- Electric field
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