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J Environ Manage. 2018 Jan 15;206:929-937. doi: 10.1016/j.jenvman.2017.11.081. Epub 2017 Dec 7.

Fluoride removal from water using a magnesia-pullulan composite in a continuous fixed-bed column.

Author information

1
School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, PR China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.
2
The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited, PR China.
3
School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, PR China. Electronic address: jiangwei0707@hust.edu.cn.
4
School of Environmental Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan, 430074, PR China. Electronic address: jxkang@hust.edu.cn.
5
Yangtze Memory Technologies Co., Ltd, PR China.
6
Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007, Australia.

Abstract

A magnesia-pullulan composite (MgOP) was previously shown to effectively remove fluoride from water. In the present study, a continuous fixed-bed column was used to examine the application of the composite at an industrial scale. The influencing parameters included bed mass (4.0, 6.0 and 8.0 g), influent flow rate (8, 16 and 32 mL/min), inlet fluoride concentration (5, 10 and 20 mg/L), reaction temperature (20, 30 and 40 °C), influent pH (4, 7 and 10) and other existing anions (HCO3-, SO42-, Cl- and NO3-), through which the breakthrough curves could be depicted for the experimental data analysis. The results indicated that MgOP is promising for fluoride removal with a defluoridation capacity of 16.6 mg/g at the bed mass of 6.0 g, influent flow rate of 16 mL/min and inlet fluoride concentration of 10 mg/L. The dynamics of the fluoride adsorption process were modeled using the Thomas and Yan models, in which the Yan model presented better predictions for the breakthrough curves than the Thomas model. Moreover, the concentration of magnesium in the effluent was monitored to determine Mg stability in the MgOP composite. Results indicated the effluent concentration of Mg2+ ions could be kept at a safe level. Calcination of fluoride-loaded MgOP effectively regenerated the material.

KEYWORDS:

Breakthrough curve; Defluoridation; Desorption and regeneration; Fixed-bed column; MgOP

PMID:
29220819
DOI:
10.1016/j.jenvman.2017.11.081
[Indexed for MEDLINE]

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