title: Adsorption of arsenic species from water using activated siderite-hematite column filters.
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 microg/g, and on hematite by 13.0 microg/g. The H2O2 conditioning enhanced adsorption efficiency of activated siderite-hematite filters up to throughput of 500 pore volumes of 500 microg/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 H2O2-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.
authors.affiliation: School of Water Resources and Environment, China University of Geosciences, Beijing 100083, PR China. hm_guo@hotmail.com
authors.forename: Huaming
authors.initials: H
authors.lastname: Guo
authors.forename: Doris
authors.initials: D
authors.lastname: Stüben
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Berner
authors.forename: Utz
authors.initials: U
authors.lastname: Kramar
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D002101:Cacodylic Acid / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry*; D005374:Filtration; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D008956:Models, Chemical; D014865:Waste Disposal, Fluid / Q000379:methods; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000191:economics / Q000379:methods*
chemical_list: D002254:Carbonates; D005290:Ferric Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D014867:Water; C000499:ferric oxide; D002101:Cacodylic Acid; D006861:Hydrogen Peroxide; C486982:siderite; D001151:Arsenic