Leopold Disk Filter

Superior performance for tertiary treatment and reuse applications

​Xylem Leopold® Ultrascreen® disk filter brings stainless steel strength and durability to tertiary treatment and reuse applications.  Validated under California Title 22 for reuse, at loading rates up to 16 gpm/ft2, it has the highest certified loading rate of any disk filter, up to 2.5 times the flow rate of other systems.  The Ultrascreen disk filter handles higher solids loading than any other disk filter too, up to 150 mg/L without clogging, compared with 50-70 mg/L for cloth disk filters.  It has even demonstrated the ability to meet Title 22 requirements of less than 2 NTU when treating influent turbidities of up to 20 NTU. 

The key is the unique design that directs flow between two rotating steel mesh screens.  The continuous disk rotation brings solids into contact with the screens at an acute angle, trapping particles that are even smaller than the mesh size.  The unit backwashes while remaining in service, presenting a fresh filter surface to influent flow, and leveling out forward flows to downstream disinfection.  The Ultrascreen disk filter enhances all types of disinfection, lowering chlorine demand and increasing UV transmissivity.

The Ultrascreen disk filter’s many adjustable features allow you to adapt to changing conditions, adjusting the speed of rotation, wash cycle time and influent levels in the feed zones to optimize operations and conserve energy.  The highly efficient backwash requires only 0.5 to 2% of forward flow, reducing pumping costs, and adding minimal additional loading to the headworks.  Combined with the high flow and solids loading capacity, The Ultrascreen disk filter eliminates worries about peak flows or temporary clarifier upsets.  It keeps you reliably operating and in compliance.

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Leopold Disc Filter 3