Hunter Water’s Largest Treatment Plant Installs LogMax® Clarifier with Edigate® Dispersion Inlet
The Burwood Beach WWTP is the largest sewage treatment system that Hunter Water operate, with a processing capacity of 44 million litres per day, or up to a population equivalent of 190000.
Project Overview
A recent upgrade included the installation of a new secondary clarifier system. EPCO Australia were awarded the design, fabrication, installation and commissioning of a 33M diameter peripheral drive clarifier mechanism.
The clarifier mechanisms consist of the following:
- A stainless steel rotating access bridge, suitable to carry one radius of scrapers complete with aluminium grating and handrail and trailing stairs for access.
- A peripheral drive unit consists of a shaft mounted ear motor, adjustable axial torque element and track wiper with corresponding emergency plough limit switch.
- A centre mechanism comprises of a combination of a slewing bearing sandwiched between a base plate secured to the access bridge and the centre column. There is a 26 ring slipring with an integrated heater mounted on the centre column.
- Mixed liquor enters via the centre column and is contained by a feedwell, which is constructed from a stainless steel frame and skinned with HDPE sheeting. Connected between the feedwell and scum skimmer is a peripheral scum scraper.
- The scum skimmer is a hinged stainless steel blade with neoprene squeegee, supported from the bridge which skims the water surface adjacent to the scum baffles.
- An array of sludge scraper blades, suspenede from the bridge by chains and vertical supports rotate around the inclined tank floor, directing the settled sludge towards the centre pocket.
- The sludge scrapers are designed to approximate a log spiral configuration with the ability to be adjusted to accommodate floor imperfections.
- There is a ring of GR316 stainless steel vee notch weir plates and baffle plates fixed to the tank wall. To limit the growth of algae in the launder channel, a self adjusting launder broom assembly is utilised.
- Stamford baffles ring the tank to redirect vertical wall currents to further reduce suspended solids flowing into the launder trough.
| Item | Value |
| No. of Units | 1 x 33M diameter |
| Bridge Length | 23.68M Rotating |
| Clarifier Type | Peripheral Drive |
| Scum Control | 2 x EPCO Scum Boxes |
| Launder | 316SS V-Notch |
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