Gas-bubbled nano zero-valent iron process for high concentration arsenate removal

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Title:	Gas-bubbled nano zero-valent iron process for high concentration arsenate removal
Authors:	Tanboonchuy, Visanu Hsu, Jia-Chin Grisdanurak, Nurak Liao, Chih-Hsiang
Contributors:	職業安全衛生系環境資源管理系
Keywords:	Arsenic Arsenate Nano-scale iron Gas bubbling
Date:	2011-02
Issue Date:	2013-10-23 11:55:40 (UTC+8)
Publisher:	Elsevier
Abstract:	In this study, batch experiments were performed to investigate a novel process for high concentration arsenate removal in the presence of air and/or CO2 bubbling. The pretreatment step, CO2 bubbling at 300 mL/min for 5 min, was taken to adjust the solution pH to an acidic environment, followed by air bubbling at 300 mL/min for 10 min to increase dissolved oxygen in the solution. In the treatment period, the nano-scale zero-valent iron was applied to remove aqueous arsenate of 3000 μg/L, while the treatment system was continuously bubbled by 300 mL/min of air. Such a process resulted in outstanding performance in arsenate removal. Furthermore, in the field groundwater application, the arsenate removal rate for the proposed process was 5 times faster than the rate measured when the system was pretreated by acidic chemical species only.
Relation:	Journal of Hazardous Materials , 186(2-3), pp.2123-2128
Appears in Collections:	[Dept. of Occupational Safety] Periodical Articles [Dept. of Environmental Resources Management] Periodical Articles

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