Overview 

The Hydro-Jet® Screen is a high-capacity combined sewer overflow (CSO) and wet weather screen that is both efficient and self-sufficient. Self cleaning, with no moving parts and no power requirements, the Hydro-Jet® Screen provides screening at high hydraulic throughput in a small footprint, reducing site space requirements and maintenance costs.

Designed to intercept and retain aesthetically offensive material and gross solids at all states of flow and then return the material to the foul sewer during and after the storm event, the Hydro-Jet® Screen uses corrugated screen panels to increase capacity without increasing footprint, making it perfectly suited to small and medium-size CSO sites. It is available in a number of different configurations and can be installed in a purpose-built chamber, retrofitted into existing CSO structures or packaged as a standalone unit.

Applications:

  • Retrofits of existing CSO facilities
  • New CSO facilities
  • Remote and satellite treatment sites
  • Floatables control for CSOs and collection systems

You can watch a brief video demonstrating the Hydro-Jet® Screen here

Designed for

Coarse particles

High flow

Trash & floatables

Benefits

Get high performance in a small footprint

Hydro-Jet® Screen is a compact system that works extremely efficiently, allowing a high hydraulic throughput in a small CSO site space.

Cut maintenance costs

The Hydro-Jet® Screen has no moving parts and no power requirements, meaning that the risk of breakage or downtime is very low. Further, the coated screen panel prevents grease buildup and blinding to ensure that the system continues to function optimally, and the screen is kept clean by a dynamic backwashing system produced by the hydraulic head present within the sewer system.

Reduce parts and repair costs

Self-cleaning and self-activating, with no power or moving parts, high-quality design materials ensure that every Hydro-Jet® Screen is built to last.

How it works

  1. Dry weather flows pass through the Hydro-Jet® Screen chamber (red arrow) via the dry weather channel and continues to a downstream treatment plant (brown arrow).

  2. During wet weather events, the flow increases as runoff drains into the combined sewer system. The water level in the dry weather flow channel rises as the flow control limits the flow passed through the continuation flow outlet.

  3. Water in the dry weather flow channel rises until it spills over the weir wall and flows down through the angled self-cleansing screen.

  4. As the water level under the screen rises to the crest of the siphon, the pocket of air trapped between the water surface and the screen creates a backwash mechanism.

  5. Debris is lifted off the screen and carried down the screenings channel, which is returned to the continuation flow (green arrow).

  6. The siphon breaks, discharging the screened effluent (blue arrow) to the receiving water body while drawing the water level in the overflow spillway down.

Technical information

Screen size

Flows from 1-10 MGD can generally be accommodated within a rectangular chamber. Due to the size of siphon required, flows greater than 10 MGD will require an L-shaped chamber configuration.

Screen weight

The weight of a single screen panel (4 ft x 2 ft) is 44 lbs.

Maximum loading rate

The maximum recommended loading rate is 294 US gal/min/ft2, which equates to 3.4 MGD per screen panel.