Disc filters use stacked discs (often grooved or micro-structured) as filter media. Water passes between or through the discs while particles are retained. When the filter blinds, the disc pack is backwashed or opened so solids can be flushed away.
Disc filters are a compact alternative to drum filters for some flows and footprints — especially where floor space is limited or several smaller units fit better than one large drum.
When disc filters can fit
- Limited footprint compared with large drums.
- Modular lines where capacity is built with several units.
- Some effluent or side-stream applications.
Compared with drum filters
- Drum filters: very common in RAS; mature practice for continuous backwash.
- Disc filters: often more compact; check hydraulics, backwash and service access.
- Both need a plan for the sludge stream and emergency/bypass.
Operating points
- Track differential pressure or level — early warning of blinding.
- Maintain seals, actuators and wash sequence per supplier.
- Verify removal against downstream TSS/turbidity, not only that “the filter is running”.
See also