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

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:206

Article

Ye, Yuanyao^1,2  Yang, Jing³  Jiang, Wei¹  Kang, Jianxiong¹  Hu, Ying⁴  Ngo, Huu Hao²  Guo, Wenshan²  Liu, Yiwen² 

[1] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

[2] Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia

[3] Sci & Technol Engn Corp Ltd, IT Elect Design & Res Inst 11, Chengdu, Sichuan, Peoples R China

[4] Yangtze Memory Technol Co Ltd, Wuhan, Hubei, Peoples R China

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

DOI  :  10.1016/j.jenvman.2017.11.081

来源: Elsevier

【 摘 要 】

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 degrees 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. (C) 2017 Elsevier Ltd. All rights reserved.

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