A new fine bubble aeration system
The aerated lagoons formerly used a coarse bubble aeration system, which was nearing the end of its usable life.
As part of the lagoon improvements the old liners were replaced, and the lagoons were desludged. These biosolids were dewatered using centrifuges and then applied to fields.
Opus DaytonKnight also undertook the construction of a new headworks building in 2009. The project included installation of 6mm perforated plate type mechanical screen and an associated screenings washer-compactor unit.
The washer-compactor system incorporates a grinder system which delivers a very clean screenings product. The system is fully automated, and is linked into the plant’s SCADA System.
Ancillary work involved:
- Adding a new MCC, complete with 460V to 600V changeover in service
- Building ventilation and heating additions
- Flow measurement on the influent pumped main
To reduce odours in the room the screening channels are covered and the foul air extracted from beneath the cover plates.
The system is sized for 20,000m3/d flow and came at a total upgrade cost of about $2 million.