Dango and Dienenthal Filtertechnik presented the new Backwash Drum Filter Type RTF at the ACHEMA 2009 in Frankfurt, Germany.
The technical planning and realisation was not easy for the engineers. It was imperative to maintain the excellent backwash performance of the Filterautomat Type DDF, which has been successful for decades. At the same time the revised construction had to be realised at a lower price and for a diversity of materials (such as steel, stainless steel or glass-fibre reinforced plastic). The answer to all these tasks is the new Backwash Drum Filter Type RTF.
Similar to the Filterautomat DDF, the highlight of the RTF is its high backwash speed of up to 10m/s and the cleaning of the complete filter area to 100%. Therefore the RTF even copes with crucial solids such as algae and other organic or inorganic solids without difficulty.
In the modified basic model of the Filterautomat DDF the filtration through the filter element takes place from the outside to the inside. In contrast, it is the other way round in the new Filter Type RTF.
When a certain defined differential pressure limit is exceeded, the filter element is discontinuously cleaned off the dirt accumulated inside. The cleaning is realised by flushing shoes, which are led across the total surface of the filter element. This design ensures that the filter does not stop filtration even when the automatic cleaning phase is in progress.
The filter elements used in the filter are produced from slotted sieves, perforated sheets and wire-cloth screens of stainless steel in different qualities with filter fineness from 5µm to 5mm. Cleaning the filter element is effected by self medium, in which the filter filtrates at the same time. Feed of external medium for cleaning the filter is not necessary.
The new Backwash Drum Filter Type RTF with a high standard of performance and quality is applicable for flow rates from 5 m³/h to 3000 m³/h. It features reliable and guaranteed filtration of solids during an interference-free operation.
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