ABSTRACT
ABSTRACT: Arsenic (As) contamination of ground water resources used for potable water supply is an emerging problem throughout the world. Except for the use of alternative, uncontaminated water sources, water treatment for As removal is often the only solution to meet the standards. The effective application of As removal processes requires the knowledge of its chemistry in natural water. Before making a choice of a suitable treatment technique it is to ascertain whether As(III) is present and to evaluate the need for an oxidation technique for As(III). The techniques existing for the removal of As include conventional processes like ion exchange and coagulation/filtration and also emerging processes with iron oxide based adsorbents like granular ferric hydroxides. While most of the removal techniques suitable for water works operation rely on sorption processes, they exhibit big differences in investment, chemical cost, maintenance and the type of arsenic bearing waste. Different options for disposal are discussed.
