Characteristics of fluoride adsorption onto aluminium(III) and iron(III) hydroxide flocs |
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| Authors: | Shinya Hamamoto Naoyuki Kishimoto |
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| Affiliation: | 1. Department of Environmental Solution Technology, Graduate School of Science and Technology, Ryukoku University, Otsu, Shiga, Japan;2. Department of Environmental Solution Technology, Faculty of Science and Technology, Ryukoku University, Otsu, Shiga, Japan |
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| Abstract: | The fluoride adsorption onto the hydroxide flocs of Al(III), Fe(III), or a mixture of the two was studied. The optimum pH was influenced by the flocs’ solubility and surface charge. Although the Al(III) hydroxide flocs had a maximum adsorption capacity at the equilibrium concentration of 8 mg-F/L, the two-stage adsorption process revealed that the mixture of the Al(III) and Fe(III) hydroxide flocs required the smallest adsorbent dose as the concentration changed from 40 to 8 mg-F/L. Thus, the simultaneous dosing of Al(III) and Fe(III) combined with a two-stage adsorption process appears to be an effective option for fluoride removal. |
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| Keywords: | Adsorption fluoride removal hydroxide floc |
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