Abstract
Arsenic is present at relatively high concentrations in surface water and groundwater as a result of both natural impacts and anthropogenic discharge, which requires proper treatment before use. The present study describes As adsorption on a siderite–hematite filter as a function of activating condition, empty bed contact time, and As species. Hydrogen peroxide activating increased As adsorption on siderite by 16.2 μg/g, and on hematite by 13.0 μg/g. The H 2O 2 conditioning enhanced adsorption efficiency of activated siderite–hematite filters up to throughput of 500 pore volumes of 500 μg/L As water. At values greater than 47 min, the empty bed contact time (EBCT) had only a weak influence on the removal capacity of pristine siderite–hematite filters. Due to the formation of fresh Fe(III)-oxide layer in the H 2O 2-conditioned filter and the pristine hematite–siderite filter, both of them may be utilized as a cost-effective reactor for treating As water. A toxicity characteristic leaching procedure (TCLP) test showed that the spent minerals were not hazardous and could be safely landfilled.
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