Removal of antimony (III) from polluted surface water using a hybrid coagulation-flocculation-ultrafiltration (CF-UF) process

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[1] Du, Xing
[2] Qu, Fangshu
[3] Liang, Heng
[4] Li, Kai
[5] Yu, Huarong
[6] Bai, Langming
[7] Li, Guibai
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Qu, F. (qufangshu@163.com) | 1600年 / Elsevier B.V., Netherlands卷 / 254期
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Antimony is a pollutant that is classified as high priority by the United States Environmental Protection Agency (USEPA) and the European Union (EU). In this work; a hybrid coagulation-flocculation-ultrafiltration (CF-UF) process was developed to remove antimony (III) from polluted surface water; and the process parameters; including the ferric coagulant (FC) dose; pH and initial contaminant loading; were systematically optimized. The results indicated that the optimum FC dose and solution pH range were 0.4mM and 7.1-9.0; respectively. Under these conditions; the antimony (III) concentrations in the CF-UF effluent were as low as 1.0-2.0μgL-1; which is significantly lower than drinking water standards (USEPA; -1; EU; Chinese drinking water standard; -1); when the initial antimony (III) loading was between 30 and 150μgL-1. The fate of antimony (III) in this process was also investigated using mass balance tests and scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDS) analyses. During FC coagulation in the CF-UF process; hydrous ferric oxide (HFO) particles were rapidly formed; and antimony (III) adsorbed on the HFO nanocrystalline particles. The HFO-antimony (III) particles were then separated from the water by the UF membrane. Thus; the CF-UF process proved to be a promising technology for antimony (III) removal and could be used to treat polluted water near antimony mines in China. © 2014 Elsevier B.V;
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