Dowdens Pumping and Water Treatment were contracted by Hutchinson Builders on behalf of Origin Energy to design, manufacture, supply, install and commission a Rotating Biological Contactor (RBC) Sewage Treatment Plant (STP) for a 400 man camp located at their Hamilton Park South work site.
The Class C treated effluent is discharged onsite via a 6ha irrigation system.
STP Water Quality Output: Class C effluent (including nutrient removal)
Daily Treated Water Production: 120kL
Incoming raw sewage is deposited in primary holding / settling tanks where primary settlement and anaerobic digestion occurs.
The retention capacity in the holding tanks ensured proper settling of bio-solids and anaerobic digestion occurred. The primary holding /settling tanks are equipped with a balancing weir, ensuring a constant flow through the plant and providing additional storage in the event of an emergency or peak flow condition.
The settling tank effluent then flows through to the rotating disc stage where aerobic treatment takes place. The surface area of the discs is sized to allow for both carbon oxidation and nitrification to take place in the rotor unit.
Turbulence created in the rotor basins ensures that the biomass is oxygenated and all matter remains in suspension.
Effluent from the rotating disc stage then passes through the humus tank / clarifier. Humus sludge is returned to the holding tanks by means of a small submersible pump which forms part of the recirculation process.
Treated effluent from the clarifier is then pumped through a media filter to further reduce the suspended solids level to meet final treated effluent quality.
Fully automated irrigation system supplying treated water to site included: