Installation for the mechanical-biological purification of waste water

An installation for the mechanical-biological purification of waste water, comprising means for the biological purification of said waste water and means for the mechanical purification of said waste water, said mechanical purification means including a drivable drum filter having a filter surface defined by a filter material web and including an inflow side, cleaning means for cleaning the filter surface, said cleaning means for the drum filter comprising a suction device having a suction nozzle, said suction nozzle being immersed in the waste water and snugly bearing against the inflow side of the filter surface, said suction nozzle having a nozzle opening the gap width of which is dimensioned such that during application of negative pressure at the suction nozzle the filter web material is partially domed at the contacted portion thereof and is partially drawn into the nozzle opening whereby leakage losses across the nozzle opening are substantially eliminated, said biological purification means further including a rotating immersion drip body having a drive shaft, said drum filter being connected with the drive shaft of the rotating immersion drip body and driven thereby.

An installation for the mechanical-biological purification of waste water incorporating at least one biological stage and one post-clarification stage, said post-clarification stage possessing a filter, the improvement comprising said filter being a drum filter having a filter surface including an inflow side, a suction nozzle operatively associated with the inflow side of the filter surface of the drum filter, said suction nozzle extending transversely with respect to the direction of relative movement between filter surface and suction nozzle, a rotating immersion drip body provided for the biological stage, said drum filter of the post-clarification stage being connected with the rotating immersion drip body and driven thereby.

An installation for the mechanical-biological purification of waste water incorporating at least one biological stage and one post-clarification stage, said post-clarification stage possessing a filter, the improvement comprising said filter being a drum filter having a filter surface including an inflow side, a suction device incorporating a suction nozzle provided for the drum filter of the post-clarification stage, said suction nozzle being operatively associated with the inflow side of the filter surface of the drum filter, said suction nozzle extending transversely with respect to the direction of relative movement between filter surface and suction nozzle, said suction device having a withdrawal line opening into the biological stage, a drive turbine provided for the drum filter, the withdrawal line of the suction device supplying said drive turbine.

An installation for the mechanical-biological purification of waste water, comprising means for the biological purification of said waste water and means for the mechanical purification of said waste water, said mechanical purification means including a drivable drum filter having a filter surface defined by a filter material web and including an inflow side, cleaning means for cleaning the filter surface, said cleaning means for the drum filter comprising a suction device having a suction nozzle, said suction nozzle being immersed in the waste water and snugly bearing against the inflow side of the filter surface, said suction nozzle having a nozzle opening the gap width of which is dimensioned such that during application of negative pressure at the suction nozzle the filter web material is partially domed at the contacted portion thereof and is partially drawn into the nozzle opening whereby leakage losses across the nozzle opening are substantially eliminated.