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This paper presents an outline of the distribution, solid-phase speciation, and desorption/dissolution of As in iron-based treatment media. Objectives include: define the solid phase speciation of As on drinking water (DW) treatment media;examine the desorption of As and solution speciation from Fe-media over 50days while minimizing microbial effects;assess the desorption and solution speciation of As as a function of pH; and,compare results from desorption experiments with results from TCLPextractions. Materials and methods included: two Fe-based media from pilot scale studies sampled at 0"-1", 1"-4", 4"-7",and 7"-10" from top of bed (granular ferric hydroxide and E33); and, media sampled under Nsub2/sub and analyzed fortotal As by EPA Method 3051,solid-phase As speciation by X-ray absorption spectroscopy (XAS),desorbed As in Hsub2/subO under anoxic conditions at 4C over 50 days inbatch experiments, anddesorbed As as a function of pH in continuous stir tank reactors. Includes table, figures.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 6File Size: 1 file , 300 KB