With the threat of a sewer overflow, you need a powerful and highly efficient screen that will keep flow moving while maintaining high treatment.

The Heliscreen® provides combined sewer overflow screening in a compact, low-headloss unit that captures trash, gross solids and floatables effectively even under high-flow, surcharged and submerged conditions.

Providing effective operation under extreme flow conditions, the Heliscreen® can handle high concentrations of screenings down to 6 mm in diameter, retaining 100% of screenings on the sanitary side of the overflow weir and preventing the need for screenings handling.

Compact, self-cleaning and easy to install and maintain, the Heliscreen® is ideal for new and retrofit installations with hydraulic or physical site constraints.

Applications

• New and retrofit CSO or SSO facilities
• Sites constrained by hydraulic levels or chamber dimensions
• Remote sites or facilities with low maintenance requirements

1. Water flows into the chamber and begins to flow through the Heliscreen® unit’s semi-cylindrical stainless steel perforated screen.
2. Water levels in the chamber rise, initiating the rotation of a helical brush mechanism on the influent side of the screen.
3. The spinning helical brush scrubs solids away from the screen and into the continuation flow while the effluent is discharged to a spillway. The screenings and continuation flow are carried on for further treatment.
4. As the water level continues to rise, spill flow and continuation flow pipes become surcharged. Excess flows are bypassed over the back plate/emergency overflow weir. Unlike most CSO screens, the powered motor of the Heliscreen® sits above the back plate to ensure that the device will continue to operate even in the event of surcharges.