Powerful filter substrates due to mineral granulates by Rotec.
Large quantities of filter substrate accumulate in retention ground filters. In order, for these filtering functions to stay ecologically and economically attractive, FLW AG: the re-search community landscaping and water management company considered various concept and tested different materials and substrates.
Within the scope of the granulate research, development engineers of the FLW AG came across mineral granulates produced by ROTEC GmbH & Co. KG.
(firmenpresse) - After several months of column experiments at the Univer-sity 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.
The use of the powerful filter substrates on the basis of mineral granulates allows for considerable reductions in mass. If the use of HygroRet had already been taken into consideration in the planning of the filter systems, excavation and soil removal volume could be adjusted downwards by 20 percent. The mass reduction then continues, for intake and distribution works, as well as for the construction materials film, fleece, and geogrid.
A test series of the substrate HygroRet under real operat-ing conditions was commissioned to the University of Münster, by Prof. Dr.-Ing. M. Uhl, specialized in the area of civil engineering to gage performance improvement proficiency.
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The Experiment concept
The objective of the lysimeter tests was the analysis of the cleaning performance of the substrate HygroRet, devel-oped by the company FLW AG, under actual operating conditions with a reduced filter thickness (60 cm). During the analysis a second reference filter bed equipped with a sand substrate with normal filter thickness (75 cm) was set up and analyzed. Both substrates meet the requirements for filter substrates according to the leaflet DWA-M 178.
The analyses were carried out in two test phases, with test phase 1 (TP 1) being carried out from October 12th 2006 to January 18th 2007. The test phase 2 (TP 2) was conducted after a charging break of several months from September 6th 2007 to December 4th 2007. During TP 1, in a period of 16 weeks, 18 normal load charges (NL) with 0.5 m³ / m² and a high load charge (HL) with 2.5 m³ / m² loading height were under-taken. The loadings were carried out in 2-3 day intervals as batch experiments. The regular feeding ensures a good establishment of the filter biocenosis. The feeding intervals were only longer before and after the high load test (4 or 5 days). To analyze the filter response to a longer dry phase, a dry phase of four weeks was carried out that concluded with a normal load feeding.
During the TP 2, within the 14 weeks, 7 charges with 0.5 m³ / m² (NL) and 4 charges with 2.5 m³ / m² (HL) loading height were conducted.
The normal load charges of both test phases (TP 1 and TP 2) served as run - in phase or rather re-run-in phase. The high load experiments conduced to the following research objectives:
• Testing of the substrate HygroRet on semiindustrial scale and under natural weathering influences
• Determination of the cleaning performance of both filter substrates under high-material and hydraulic stresses
• Testing of the impact of a reduced substrate layer for cleaning performance and breakdown behavior
• Initial examination of the suitability of the substrate for cleaning performance on transportrelated substances
Retention ground filters (RGF) are open wet retention ba-sins that hold the water temporarily and are sealed towards the ground and constructed with a ground filter bed. They are part of a drainage system that is used for the ongoing treatment of rainwater runoff of mixing, and separation systems, as well as for road drainage.
In Germany, these facilities are usually combined with a sedimentation basin that is located upstream. The waste water filtration is done by percolation often through reed beds that consist of a filter substrate and an underlying gravel drainage layer. During percolation the waste water is subject to biological, chemical and mechanical cleaning processes. Some filters are also topped with an additional layer of gravel or grit for soil erosion control.
A uniform distribution of substrate grains (Cu < 5) and the high total pore volume (40 to 50 Vol.-%), along with fa-vorable pore size distribution, ensure a good ratio between percolation, air balance and gas exchange.
The hydraulic permeability value of ≥ 10-4 m/s is ideally situated between percolation performance and contact time to the sorptive medium.
R O T E C GmbH & Co. KG
ROHSTOFF-TECHNIK
GEO: Dipl-Ing. Guido Runkel
Bubenheimer Weg
D-56220 Urmitz
Germany
Tel.:+492630-955740
Fax.:+492630-955749
E-mail: g.runkel(at)rotec-rohstoffe.de
Internet: www.rotocell.de, www.rotopor.de
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Datum: 01.06.2010 - 02:17 Uhr
Sprache: Deutsch
News-ID 1015517
Anzahl Zeichen: 0
contact information:
Contact person: GEO: Dipl-Ing. Guido Runkel
Town:
Urmitz
Phone: +492630-955740
Kategorie:
Mining
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