Lizama Allende, Katherine, Fletcher, Timothy, and Sun, Guangzhi (2012) Removal of arsenic by coprecipitation with iron in vertical flow wetland columns. In: Proceedings of the 6th International Conference on Environmental Science and Technology (2) pp. 312-318. From: ICEST2012: 6th International Conference on Environmental Science and Technology, 25-29 June 2012, Houston, TX, USA.

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Abstract

This study investigated the removal of arsenic in twenty wetland columns, planted with Phragmites australis, from a synthetic acidic wastewater that simulated water in a highly polluted river in northern Chile, the Azufre River. The efficiencies of four wetland media, cocopeat, zeolite, limestone, and river gravel, were investigated. A range of environmental factors, including pH, Eh, temperature and SO4 level, were monitored alongside the removal rates of arsenic and iron, in order to explain the factors that must be taken into account when applying the wetland system to treat acidic wastewaters. Experimental data demonstrated that the primary route of arsenic removal is via coprecipitation with iron at increased pH level. The chemical equilibrium of arsenic-iron coprecipitation has been analysed. Also discussed are the effects of wetland media on arsenic mass removal rates, and the potential routes of arsenic removal in constructed wetland systems under oxidising condition.

Item ID:	30457
Item Type:	Conference Item (Research - E1)
ISBN:	978-1-62748-656-9
Related URLs:	Publisher
Date Deposited:	09 Oct 2014 04:47
FoR Codes:	09 ENGINEERING > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes @ 50% 09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 50%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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