Powerful filter substrates

Large quantities of filter substrate accumulate in retention ground filters (Fig.). Within the scope of the granulate research, development engineers of the FLW AG came across mineral granulates produced by ROTEC GmbH & Co. KG. After several months of column experiments at the University of Applied Science in Münster, it could be proven that the filter substrate HygroRet that is based on mineral granulates from Rotec purified significantly better with a 20  % lower fill height than typical sand carbonate mixtures. The adsorption capacity for ammonium compared to carbonate sands improved by a factor of 175, so that the ammonia that is toxic to fish was converted to nitrate by almost 100  %, even during winter months. The higher overall pore volume improves the water retention capacity and the air supply, which positively affects the biological processes, such as biofilm formation, and increases process stability.

ROTEC GmbH & Co. KG, Urmitz (D),

Tel.: +49 2630 95574-0, www.rotocell.de


Related articles:

Issue 2013-09

High reactivity

Flue gas desulphurization by the semi-dry process

Flue gases with environmentally harmful sulphur compounds (SO2 and SO3) are produced wherever sulphurous organic material is incinerated. Sulphur oxides occur in coal-fired power plants, waste...

Issue 2013-09

Keeping air clean with innovative filter and dust ­collection technology

W ith the introduction of the new PowerCore® technology and the development of more effective filter media, Donaldson has succeeded in realizing higher efficiencies coupled with a lower consumption...

Issue 2021-06 “All-in-one” process

Continuously operating Ploughshare® Mixer KM

L?ödige Process Technology developed a process engineering solution for the production of monocalcium phosphate (MCP). The powder, which is an essential component of feed and phosphate fertilizers,...

Issue 2020-11 Dry stacking of tailings

The safe alternative in mining

1? Introduction As a consequence of devastating dam collapses, tailings management in mining has come into increasing focus in recent years [1]. Worldwide, there are around 3500 dams for retention...

Issue 2011-06

Innovative filtration and drying technologies reduce operating costs

Filtration and adsorption drying systems are basic technologies for the processing of compressed air and gases, which are used as process utilities. The reduction of the operating costs and,...