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 2011-03

Whitehouse Scientific Ltd.

Whitehouse Scientific produce a range of glass microspheres for calibrating all methods of particle size analysis from the humble sieve to the most complex laser diffraction analyser. The standards...

Issue 2011-03

World Minerals – IMERYS

World Minerals is a world leading supplier of engineered mineral products derived from diatomaceous earth and expanded perlite, and is the world’s largest mineral filter aid producer. The filter aids...

Issue 2015-06

The right belt for every task

At the ACHEMA in Frankfurt/Main from 15 to 19 June  2015, GKD – GEBR. KUFFERATH AG‘s WEAVE IN MOTION division took its integrated capabilities in the field of filter belts as the central focus of...

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,...

Issue 2018-07-08

Raw material extraction

Dear Readers, There are approximately 3500 dams for processing residues in the mining industry worldwide – and the trend is rising due to the decreasing ore content in the mineral deposits. If...