Ferric hydroxide granular

Aeration, Stripping Lime Softening Anion Cation Reverse Osmosis Ultrafiltration Chemical Oxidation Disinfection GAC PAG Granular Ferric Hydroxide Activated Alumina... 

Driehaus, W Jekel, M. and Hildebrandt, U. (1998) Granular ferric hydroxide - a new adsorbent for the removal of arsenic from natural water. Journal of Water Supply Research and Technology - Aqua, 47, 30-35. 

Badruzzaman, M., Westerhoff, P. and Knappe, D.R. (2004) Intraparticle diffusion and adsorption of arsenate onto granular ferric hydroxide (GFH). Water Research, 38(18), 4002-12. 

Ghosh, A., Mukiibi, M., Sac/, A.E. and Ela, W.P. (2006) Leaching of arsenic from granular ferric hydroxide residuals under mature landfill conditions. Environmental Science and Technology, 40(19), 6070-75. 

Metal-oxide adsorption using packed beds of activated alumina, modified activated alumina, granular ferric hydroxide, iron-oxide coated sands, and other specialty adsorbents... 

The granular metal-oxide adsorbents discussed in this chapter are activated alumina (AAl), modified activated aluminas, iron-oxide-coated sand (IOCS), granular ferric hydroxide (GFH or GEH), and proprietary filter media such as ADI. Although they differ in physical appearance, they all involve hydrous oxides of iron or aluminum that remove arsenic by a process of ligand exchange. Generally, they are employed in packed beds or small filters containing 28 X 48 mesh (0.6-... 

Three of the recently introduced arsenic adsorbents, iron-doped alumina, iron-oxide coated sand, and granular ferric hydroxide, merit a brief discussion here because of their demonstrated effectiveness in removing arsenic. Because ferric hydroxide has a higher capacity for arsenic than does an equivalent surface area of aluminum hydroxide, iron-doped aluminas have been designed for the purpose of improving their arsenic capacity. One such adsorbent is Alcan AAFS-50, a brown-colored promoted alumina that is advertised to have five times the arsenic capacity and less pH sensitivity than conventional activated aluminas (6). Unlike conventional aluminas, AAFS-50 cannot be regenerated, but it reportedly can be landfilled without special treatment. Our recent research (7) showed... 

Iron-oxide-coated sand is another recently introduced arsenic adsorbent that has been shown to have promise for arsenic removal (8,9). However, because the effective adsorption area is only on the surface of the particle, minimal capacity should be expected compared with adsorbents that are pure hydrated iron oxide and are truly porous. An example of the latter type of adsorbent is granular ferric hydroxide (5). 

The expected influence of silica on other metal oxide adsorbents, such as granular ferric hydroxide, is similar to its negative effect on alumina. Phosphate and fluoride are other strong ligands commonly found in groundwater that exhibit a negative influence similar to that of silicate on the arsenic capacity of alumina and GFH (5,12). Thus, the concentrations of these ions must be known before a reasonable estimate of arsenic capacity can be made. 

GEH Wasserchemie. GEH-granular ferric hydroxide technical note, Osnabruck, Germany GEH Wasserchemie Gmbh Co. KG, 1998. 

Iron-based sorbents Granular ferric hydroxide Fe(OH) binds F ... 

Sperlich, A., Werner, A., Genz, A., Amy, G., Worch, E. Jekel, M. (2005) Breakthrough behavior of granular ferric hydroxide (GFH) fixed-bed adsorption filters modeling and experimental approaches. Water Research, 39, 1190-1198. 

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