Screen gross solids and floatables at CSO sites with infrequent overflows.
Though overflows may be infrequent, when they occur they are still damaging to the environment. The Hydro-Static® Screen offers an economically sustainable screen for combined sewer overflow sites with infrequent overflows, but at which environmental protection is still a concern.
The Hydro-Static® Screen offers an economically sustainable screen for combined sewer overflow (CSO) sites with infrequent overflows, but at which environmental protection is still a concern. A non-powered screening technology, the Hydro-Static® Screen provides effective gross solids and floatables capture and works with small flows and small budgets.
The Hydro-Static® Screen is available in two configurations, either as an Up-Flow screen or a weir-mounted Through-Flow screen. With no moving parts and flow-modifying components in the up-flow configuration to provide partial cleaning, maintenance is kept to a minimum. To protect against corrosion components are typically supplied in grade 304 stainless steel as standard, and the mesh screen panels are coated in a non-stick polymer to reduce blinding.
The Hydro-Static® Screen is mounted horizontally over the dry weather flow channel so that the flow passes up and through the screen in a storm event.
The Hydro-Static® Screen is offset from the vertical to encourage screenings to drop away from the corrugated mesh once the storm has subsided.
The Hydro-Static® Screen provides effective gross solids and floatables capture and works with small flows and small budgets. Mesh screen panels are coated in a non-stick polymer and corrugated to increase flow-through capacity.
The Hydro-Static® Screen has no moving parts and requires no power to operate. Patented flow-modifying components provide partial cleansing of the screen, and a polymer-coated mesh reduces the risk of blinding.
Components can be pre-installed in a precast concrete chamber to enable swift installation on site.
During dry weather conditions the flow to the treatment works will pass underneath the screens in the dry weather flow channel.
In a storm event the inflow rate to the chamber will exceed the outflow rate causing water levels to rise within the chamber and spill through the screens (green arrows).
The Hydro-Static® Screen is mounted over the dry weather flow channel so that the flow passes up and through the screen during a storm event. Solids and floatables are trapped below the screen and returned to the sanitary continuation flow (brown arrow). Screened effluent is discharged to a receiving waterway (blue arrow).
An emergency overflow weir is incorporated into the screen should the peak design flow be exceeded.
The recommended design loading range is 73 to 143 gal/min/ft2 (nominal value: 110 gal/min/ft2).
Headloss ranges from 1.5 in at 73 gal/min/ft2 to 4 in at 143 gal/min/ft2.
The weight of a standard panel (4 ft x 2 ft) is 44 lbs. This equates to 56.5 lbs of plan area.