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Wang Zhili, Zhang Huanzhen, Chen Shuifei, Zhang Liguo. Fluoride removal from groundwater by FeCl3-activated natural zeolite[J]. Chinese Journal of Environmental Engineering, 2013, 7(3): 820-824.
Citation: Wang Zhili, Zhang Huanzhen, Chen Shuifei, Zhang Liguo. Fluoride removal from groundwater by FeCl3-activated natural zeolite[J]. Chinese Journal of Environmental Engineering, 2013, 7(3): 820-824.
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Fluoride removal from groundwater by FeCl3-activated natural zeolite

  • 1.

    School of Water Resources & Environment, China University of Geosciences, Beijing 100083, China

  • 2.

    Longhua Environmental Protection Agency of Chengde, Chengde 068150, China

  • Received Date: 10/01/2012
    Accepted Date: 27/11/2011
    Available Online: 18/03/2013
    Fund Project:
  • Effects of four anions in groundwater: Cl-, HCO3-, SO42- and PO43- on the capacity of defluoridation of FeCl3-activated natural zeolite were investigated. The mechanism of defluorination and surface composition of adsorbent were analyzed. The results showed that the removal efficiencies of fluoride for different initial fluoride concentrations of water samples were gradually reduced with the increasing concentrations of anions. Effect of Cl- on the adsorbent was tiny with slower decrease of fluorine removal rate. With the increase of HCO3- concentration (from 100 mg / L to 1 000 mg / L), pH of water slowly increased to 9.52 from 8.42, and removal efficiency of flouride tardily declined from 70.36% to 56.73% (2 mg/L). Effects of SO42-and PO43- on the capacity of defluoridation of the modified zeolite were greater, with rapid decrease of fluorine removal rate. And the impact of PO43- was greater than SO42-. The adsorption capacity of FeCl3-activated natural zeolite on Cl-, HCO3-, SO42- and PO43- was PO43->SO42->HCO3->Cl-.
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Fluoride removal from groundwater by FeCl3-activated natural zeolite

  • Received Date: 10/01/2012
  • Accepted Date: 27/11/2011
  • Available Online: 18/03/2013
Fund Project:

Abstract: Effects of four anions in groundwater: Cl-, HCO3-, SO42- and PO43- on the capacity of defluoridation of FeCl3-activated natural zeolite were investigated. The mechanism of defluorination and surface composition of adsorbent were analyzed. The results showed that the removal efficiencies of fluoride for different initial fluoride concentrations of water samples were gradually reduced with the increasing concentrations of anions. Effect of Cl- on the adsorbent was tiny with slower decrease of fluorine removal rate. With the increase of HCO3- concentration (from 100 mg / L to 1 000 mg / L), pH of water slowly increased to 9.52 from 8.42, and removal efficiency of flouride tardily declined from 70.36% to 56.73% (2 mg/L). Effects of SO42-and PO43- on the capacity of defluoridation of the modified zeolite were greater, with rapid decrease of fluorine removal rate. And the impact of PO43- was greater than SO42-. The adsorption capacity of FeCl3-activated natural zeolite on Cl-, HCO3-, SO42- and PO43- was PO43->SO42->HCO3->Cl-.

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