ROTARY SIEVES AND SCREENS
 

 Waterco rotary sieves allow for large flows to be pumped over the Vee-Wire® sieve screen inside, which separates the liquids and solids as the system rotates.

The slurry is pumped into the rotary sieve, and as the liquid and smaller solids pass through the slots in the screen, the larger solids travel down the length of the screen to the discharge end.

Rotary sieves can be manufactured in either 304 or 316 stainless steel, and come in any size diameter and length.

The screens inside the rotary sieve are especially designed to fit the specifications of each rotary sieve and are available separately from the rotary sieve itself. They are ideal for
replacing worn-out screens in existing applications.

Based on the screening needs, the slot and wire sizes can be individualized to each process.

CONTRA-SHEAR INCLINED ROTARY SCREEN FOR
COMBINED SCREENING AND COMPACTION
The contra-shear inclined rotary screen (IRS) is used for fine screening of sewage and industrial effluent where screening and solid extraction capability is desired within a single unit. installed at an angle of 35 degrees, the screen drum is constructed out of Vee-Wire® screen,
however perforated plate and mesh designs are also offered.

The influent enters into the feed end of the screen drum and exits through the Vee-Wire slots or holes, as the case may be. Solids larger than the slots or holes are retained and build up on the screen surface. This buildup increases the head loss across the screen, which initiates the rotation of the screen drum.

The cycle and frequency of operation depends on the application and the amount of solids captured. The solids are dropped into a central trough by a series of baffles welded inside the screen drum.

A screw press, located inside the trough, transports and dewaters the solids as it travels upwards towards the discharge end.

An automatic sparge system, comprised of two sparge pipes with nozzles, operates when the screen drum rotates and keeps the drum clean.

The IRS is capable of handling flow rates from 1,188 to 20,253 gpm (270 to 4,600 m³/hr) through a single unit.

Features and Benefits
  -Slot sizes from 0.02 to 0.24 in. (0.5 to 6.0 mm) with Vee-Wire models
  -Slot sizes from 0.08 in. (2 mm) and up with perforated plate and mesh models
  -304SS or 316SS construction
  -Single motor drives the drum and the screw press
  -Compact, fully enclosed in-channel design
  -Low and consistent head loss
  -Self-cleaning operation
  -Low power consumption and operating costs
  -Heavy-duty construction
  -High solids capture