Chemosphere, Vol 84 No 8, p 1032-1043, 2011
Constructed wetlands are a cost-effective natural system successfully used for removing various pollutants, and they have shown potential for removing arsenic. The reactivity of arsenic means that different arsenic species, influenced by vegetation, supporting medium, and microorganisms, can be found in wetlands. Although sorption, precipitation, and coprecipitation are the principal processes responsible for arsenic removal, bacteria can mediate these processes and play a significant role under favorable environmental conditions. The most important factors affecting the speciation of arsenic are pH, alkalinity, temperature, dissolved oxygen, the presence of other chemical species (iron, sulfur, phosphate), carbon sources, and the wetland substrate. This paper reviews current understanding of wetland arsenic removal processes, discusses implications for treatment wetlands, and identifies critical knowledge gaps and areas for future research. http://www.jlakes.org/web/removal-processes-arsenic-CW-C2011.pdf
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