The Q-Guard™ stormwater treatment device operates in 'treatment' mode as follows:
1. Stormwater run-off enters the flow control unit and is directed into the treatment zone by the inclined weir and the side chutes.
2. As the stormwater is directed into the treatment zone it creates an expanding three-dimensional spiral flow pattern in a vertical plane, reducing flow velocities and providing sufficient in-chamber retention times to allow for the removal of pollutants.
3. As the pollutants enter the treatment zone they are processed as follows:
- Free oils and hydrocarbons rise to the water surface and are stored in the floatables storage zone.
- Floating litter also rises to the water surface and is stored in the floatables storage zone (if floating litter is waterlogged then it may settle in the solids storage zone).
- Aggregates and sediment settle to the solids storage zone on the chamber floor.
4. Once the stormwater run-off is treated it passes through the inverted conical screen. The screen is designed to maximise the discharge area whilst retaining floating and submerged litter and providing a self-cleansing operation.
5. Treated run-off then leaves the chamber via the treatment flow outlet and outlet pipe.
Large hinged lids and a relatively shallow treatment chamber allows for the easy removal of trapped pollutants with a standard educter or vacuum truck.
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