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WATER & WASTEWATER MANAGEMENT


and fi ner weft than warp wires.


T is construction is the reason for the smooth, closed


surface and robust mechanical strength of this mesh type. T e


apertures of the slot-shaped


pore geometry are smaller in the mesh surface than within the mesh. T is enables them to


deliver excellent particle retention and a signifi cantly higher fl ow rate with the same opening. In addition, the single- ply construction off ers a high dirt- holding capacity and good regenerability. Furthermore, the stainless steel mesh does not cause any contamination through process-related plastic abrasion – unlike the plastic media that have mostly been used in wastewater treatment previously.


Using a procedure that determines the bubble point with the help of CFD simulations, GKD can determine every pore size quickly and reliably


CHALLENGING DEVELOPMENT PROCESS Based on the existing mesh design of its ODW 10, GKD developed the design of the weave with the assistance of computers. T e required permeability of 6 µm was determined using numeric fl ow simulation. However, the real challenge began when it came to putting the mesh into production. T e fi rst task was to fi nd a supplier to develop and produce the wire designed specifi cally for the application. T is innovative, extremely clean and particularly ductile stainless steel wire had to exhibit the relevant diameter as well as consistent material properties over the complete length of the wire. In close collaboration with the wire supplier and in intensive test series, it took a year to develop this wire. It took a further year until GKD was able to process this extremely fi ne wire reliably. Despite possessing leading weaving technology, it proved exceedingly challenging to adapt the machine technology – wire feed and sensor system – to the specifi c wire properties. Following many setbacks and revisions to the design, it was fi nally possible to permanently stabilise the production cycle for the new stainless steel dutch weave with a pore size of 6 µm in line with the formula specifi ed by the


German Institute of Mechanical Process Engineering (IMVT). GKD also had to break new ground with the measuring technology for inspecting selectivity, as a 6 µm pore is very diffi cult to measure with the conventional glass bead test. Using a procedure developed in-house, which determines the bubble point with the help of CFD simulations, GKD can determine every pore size quickly and reliably. When using ODW 6, plant operators can therefore rest assured that it removes all spherical particles above the separating limit of 6 µm.


PIONEERING COMPARATIVE TESTS OF FILTER MEDIA In parallel with the complex development work for this precision mesh, GKD supported OEMP project partner TU Berlin with the in-situ tests for comparing two fi lter systems with diff erent fi lter media. T e object of the investigation was the runoff water from the Ruhleben sewage plant in Berlin. T is sewage plant treats the wastewater from up to 1.6 million population equivalents, working according to the activated sludge process with denitrifi cation and biological phosphorous elimination. In dry weather, the daily cleaning capacity is 247,500m3 and when it rains, 600,000m3


. For the


www.engineerlive.com 49


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