Iron-impregnated granular activated carbon for arsenic removal: Application to practical column filters

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:239

Article

Kalaruban, Mahatheva¹  Loganathan, Paripurnanda¹  Tien Vinh Nguyen¹  Nur, Tanjina¹  Johir, Md Abu Hasan¹  Thi Hai Nguyen²  Minh Viet Trinh²  Vigneswaran, Saravanamuthu¹ 

[1] Univ Technol, Fac Engn & Informat Technol, Sydney, NSW 2007, Australia

[2] Vietnam Acad Sci & Technol, Inst Environm Technol, 18 Hoang Quoc Viet Rd, Hanoi, Vietnam

关键词: Arsenic;    Adsorption;    Adsorption models;    Granular activated carbon;    Water treatment;   

DOI  :  10.1016/j.jenvman.2019.03.053

来源: Elsevier

【 摘 要 】

Arsenic is a major drinking water contaminant in many countries causing serious health hazards, and therefore, attempts are being made to remove it so that people have safe drinking water supplies. The effectiveness of arsenic removal from As(V) solutions using granular activated carbon (GAC) (zero point of charge (ZPC) pH 3.2) and iron incorporated GAC (GAC-Fe) (ZPC pH 8.0) was studied at 25 +/- 1 degrees C. The batch study confirmed that GAC-Fe had higher Langmuir adsorption capacity at pH 6 (1.43 mg As/g) than GAC (1.01 mg As/g). Adsorption data of GAC-Fe fitted the Freundlich model better than the Langmuir model, thus indicating the presence of heterogeneous adsorption sites. Weber and Morris plots of the kinetic adsorption data suggested infra-particle diffusion into meso and micro pores in GAC. The column adsorption study revealed that 2-4 times larger water volumes can be treated by GAC-Fe than GAC, reducing the arsenic concentration from 100 mu g/L to the WHO guideline of 10 mu g/L. The volume of water treated increased with a decrease in flow velocity and influent arsenic concentration. The study indicates the high potential of GAC-Fe to remove arsenic from contaminated drinking waters in practical column filters.

【 授权许可】

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