How do Ospa vacuum filter systems work?
The fully automatic Ospa multi-layer vacuum filters use the suction filtration method.
The filter vessels are produced in a rectangular design from polypropylene: closed on top, with removable cover, connection for safety overflow to the water reservoir, electronic level monitoring, viewing windows for visual inspection of filter operation and layer separation during filter backwashing, lateral manhole and access opening under the nozzle bottom. Untreated water inlet and sludge water discharge device for DIN-compliant, unpressurized filtration and backwashing operation of the filter system, for uniform vessel flow and uniform distribution of contaminants over the entire filter surface without removal of filter material, at backwashing speeds according to DIN 19643 of 50–55 m/hr. The Ospa multi-layer suction filters have a nozzle bottom with supporting and filter layers arranged on top.
In accordance with DIN 19643, the filtering layers consist of 400 mm quartz sand, in the 0.4–0.8 mm particle size group, and 400 mm hydroanthracite, in the 0.6–1.6 mm particle size group, with properties similar to those of activated carbon. As a result, they are able to reduce combined chlorine and other organic chlorine compounds which are adsorbable on activated carbon, such as THM and AOX. Electronically controlled pneumatic flaps for fully automatic filter backwashing and channel discharge of first filtrate. Closes automatically in case of power outage or compressed air failure.