GRANULAR FERRIC HYDROXIDE - A NEW ADSORBENT FOR THE REMOVAL OF ARSENIC FROM NATURAL-WATER

Granular ferric hydroxide (GFH) is an adsorbent, developed for arsenic removal from natural water, It can be applied in simple fixed bed rea ctors, similar to those for activated alumina or activated carbon, GFH has a high adsorption capacity in model systems and in natural waters , The application of GFH in test adsorbers showed a high treatment cap acity of 30000-40000 bed volumes, until the nem German and WHO drinkin g water standard for arsenic of IO mu g/L was exceeded, The residue of this technique is a solid waste, enriched with arsenic, The typical r esidual mass is in the range of 5-25 g/m(3) treated water, This new te chnique for arsenic removal provides a simple and effective method, pa rticularly for small water facilities.