Application of biological processes for the removal of arsenic from groundwaters

被引:296
作者
Katsoyiannis, IA [1 ]
Zouboulis, AI [1 ]
机构
[1] Aristotle Univ Thessaloniki, Dept Chem, Lab Gen & Inorgan Chem Technol, Thessaloniki 54124, Greece
关键词
arsenic; removal; iron oxides; iron oxidizing bacteria; biological oxidation;
D O I
10.1016/j.watres.2003.09.011
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Bacteria are widespread, abundant, geochemically reactive components of aquatic environments. In particular, iron-oxidizing bacteria, are involved in the oxidation and subsequent precipitation of ferrous ions. Due to this property, they have been applied in drinking water treatment processes, in order to accelerate the removal of ferrous iron from groundwaters. Iron also exerts a strong influence on arsenic concentrations in groundwater sources, while iron oxides are efficient adsorbents in arsenic removal processes. In the present study, the removal of arsenic (III and V), during biological iron oxidation has been investigated. The results showed that both inorganic forms of arsenic could be efficiently treated, for the concentration range of interest in drinking water (50-200 mug/L). In addition, the oxidation of trivalent arsenic was found to be catalyzed by bacteria, leading to enhanced overall arsenic removal, because arsenic in the form of arsenites cannot be efficiently sorbed onto iron oxides. This method comprises a cost competitive technology, which can find application in treatment of groundwaters with elevated concentrations of iron and arsenic. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:17 / 26
页数:10
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