Biosecurity washbays can be either roofed or unroofed
The waste water requires “screening” pre discharge to sewer.
In this case gravity discharge via a static below ground Petrol/Oil Interceptor is not an option
Typically the layout includes
Roofed washbays require a silt collection pit
PT/600/100/D Refer drawing – 600mm square MDPE Pit with class “D” grating, removable silt basket and 100mm or 150mm outlet
Unroofed washbays in excess of 20 square metres require a Trade Waste/Stormwater Diversion System.
FF600/150/150– Refer drawing – 600mm Square Class “B” or “D” Grated Cover and 150mm Trade Waste and 150mm Stormwater outlets
Typical Rainfall IFD requires site specific calculation
Caters to Wash Water, First Flush and Stormwater Flow Rates<20.0 L/sec
This option provides for wash water to be directed to Trade Waste, programmable volume of First Flush of rainwater (after any wash event) arriving on the paved catchment being directed to Trade Waste, with any further rainfall being directed to Stormwater
Dirty Water collection tank to be sized according to the combined first flush and wash-water volume and the required time interval for disposal of the water content before wishing recommences
Refer below Ground Collection tank sizing drop down tab
Mechanical Oil/Water Separator with hourly treatment rate is selected relative to the disposal and first flush volume
Refer Oil/Water Separator drop down tab for selection of equipment package suited to this specific purpose