The Camden Haven Sewerage Scheme has a wastewater treatment plant (WwTP) located in Bay Street Dunbogan, and was originally constructed in the mid 1970s. The original WwTP provided biological secondary treatment within a trickling filter plant, and tertiary treatment in the form of UV disinfection. Due to deficiencies with the trickling filter plant and the ageing technology, the WwTP was augmented in 2011 to improve effluent quality.
The plant has a capacity of 15,000 EP - in other words, it has the capacity to treat raw sewage equivalent to that generated by a population of 15,000 people.
Incoming sewage is screened via two rotating drum screens to remove any solids larger than 2mm. Grit removal is also utilised to remove any sand that enters through the wastewater system. The screening and grit are disposed of to landfill while the remaining sewage continues on to the main process.
The Camden Haven WwTP features a membrane bioreactor which is a state of the art process involving activated sludge secondary treatment with membrane filtration tertiary treatment. The activated sludge process concentrates the naturally occurring bacteria in sewage to remove the organic waste and also to reduce the nutrient load prior to discharge of the treated effluent.
The membrane filters are submerged in the activated sludge and provide a physical barrier filtering solids out down to 0.2 microns (0.0002mm) which not only removes all solid particles but also removes pathogens such as bacteria and protozoa.
The final effluent is further disinfected using UV lamps and chlorination which eliminate any microorganisms remaining. The highly treated effluent is then discharged via a shoreline outlet.
Sludge generated from the Camden Haven WwTP is collected in three sludge lagoons on site. These hold the sludge whilst any water released is returned to the treatment process for additional treatment.
As with all other organic solids produced by wastewater treatment plants in the Port Macquarie-Hastings area, the biosolids are transported to the Cairncross composting facility to be incorporated into compost.
This page was last updated on: 18 June 2020