PERFODRUM Screen Applications

Municipal and Industrial Waste Water Treatment
DRD Rotary Drum Screw-Screens cater to higher flow rates than the DSS Screw-Screens screens: furthermore, higher separation efficiencies can be anticipated at peak flows.
The rotary drum design ensures separated solids are retained and cannot bypass the screen even at peak flow loading.
MBR (Membrane) Reactor Pre-Treatment
DRD perforated-hole drum screens impart high separation efficiencies using either a 1 or 2 mm mesh respectively for hollow fibre or flat plate membrane processes.
Improved performance efficiencies of MBR operation can also be applied by utilizing 0.5 or 1 mm wedge-wire mesh for enhanced removal of fibre or hair and the possible tangling hindrances this may cause. High separation efficiencies and screenings capture within the enclosed drum ensures solids are retained and cannot pass through or overflow.
Storm Overflow Treatment
DRD Drum Screens can be applied as combined storm overflow (CSO) screens using 6 mm perforated hole mesh for flows up to 2,000 l/s. Increased duties, 4,000 l/s, 6,000 l/s, 8,000 l/s can be handled where multi-duty units are used.

To suit various requirements, DRD Drum Screens can be supplied with or without wash and compaction. This will allow options for;

  1. screenings removal and compaction at the CSO station,
  2. screenings removal and compaction at the CSO station with return of washed faecal and other semi-solid matter only to the downstream sewer or,
  3. return of all screenings, faecal and other semi-solid matter to the downstream sewer

Applications include combined sewer systems in addition to municipal and industrial waste water treatment works - either as CSO duty only, or as a single integrated CSO and preliminary treatment screen for all effluents entering the works.

All flows entering the screen drum become entirely enclosed which ensures separated solids are retained within the screen and cannot overflow even at peak flow loading.

Improved storm overflow solids removal efficiencies can be gained with consequential reductions in BOD and COD by utilizing 0.5 or 1 mm wedge-wire mesh.


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