The treatment process being used in the extended aeration tanks is the intermittent decant extended aeration (IDEA) mode of the activated sludge process. There are two phases of operation of this IDEA process:
Treated effluent from the aeration tank is discharged into the one day detention catch pond. If any sludge is being wash-out from the aeration tank it would settle in the pond. Effluent from the catch pond is then diverted to the 9 days detention effluent pond, after which is finally discharged into whittingham swamps and further to Hunter River.
Excess sludge from the aeration tanks is pumped into the sludge lagoons and is allowed to accumulate before ultimate removal and disposal. Clear water from the top of sludge lagoons returns to the inlet works by gravity / by pumping.
To report a complaint regarding Council's Sewage Treatment Plant (EPL 3088) or to report a sewage overflow please contact:
02 6578 7290 during office hours (8am - 4.30pm)
02 6572 1400 after hours