The History of GEHThe subject of “arsenic removal” mainly became newsworthy in Germany after publication of a new arsenic standard for drinking water of 10 μg/l in 1990. The intention was to develop a simple, low-maintenance arsenic removal procedure for this application using activated iron oxides.
From 1990 to 1994, Department of Water Quality Control at the Technical University of Berlin developed a procedure to manufacture an activated iron hydroxide that can be installed into fixed bed absorbers and that has a high adsorption capacity for arsenic.
The new adsorber material has been commercially manufactured since 1997 and sold under the trade name granulated iron hydroxide - GEH®. The first plant to remove arsenic with GEH® was put into operation in 1997.
From this time onwards, the history of the company has been characterised by continual expansion, which was managed by maintaining the quality of the product and deliveries. Today, around 2000 plants with GEH® adsorbers are installed throughout the world with treatment capacities of between 2 – 19,000 m3/day and arsenic concentrations of up to 1,000 μg/l.
Due to the operating experiences gained and the continual further development of the material, treatment capacities of up to 300,000 bed volume are achieved nowadays.
Thanks to its special, specific properties, GEH® is now employed very successfully in various areas of application. Other substances besides arsenic are also removed, such as antimony, phosphate and copper, to name a few.