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Kew/Kendall Sewerage Scheme

The Kew/Kendall Sewerage Scheme consists of a wastewater treatment plant (WwTP) and a pipeline network and pumping stations to serve the three townships of Kew, Kendall and Herons Creek.  The WwTP is located on the Pacific Highway at Herons Creek.

The plant has a capacity of 1,720 EP - in other words, it has the capacity to treat raw sewage equivalent to that generated by a population of 1,720 people.

Pre-Treatment

Pre-treatment is relatively simple yet very effective, and involves screening.  The removed solids are sent to landfill.

Main Treatment

The Kew/Kendall WwTP involves the process of activated sludge. The activated sludge treatment method that is used in the STP is intermittently decanted extended aeration (IDEA).  This method is generally preferred in regional areas because of the high quality effluent produced, along with its simplicity and cost effectiveness compared to other methods.

It is simple in that the essential activated sludge processes of aeration, settling, decanting and sludge removal are all carried out in a single lagoon rather than having separate vessels for each.

The next stage in treating water after the IDEA is disinfection by UV radiation. To achieve this at Kew/Kendall, the treated water is fed into a maturation pond where it is exposed to sunlight to enable the UV breakdown of any pathogens or other dangerous microbes still present in the wastewater.  To ensure total removal of these pathogens, when the water leaves the maturation pond it enters a UV Radiation Unit, which works by passing wastewater through banks of UV lamps that kill bacteria in the water. UV Radiation Units are widely considered to be an excellent way to thoroughly disinfect water and are also commonly used in the disinfection of drinking water.

Prior to reuse, the fully treated water is put into a 50Ml storage pond on the WwTP site. The storage pond has many uses. It provides stabilisation, storage and minor treatment in the event of wet weather or inconsistencies in the system, and also provides storage so that water is always available for reuse.

A very positive point about the Kew/Kendall scheme is the reuse of the treated water. The final effluent from the WwTP is used to irrigate the Camden Golf Course and also, in a joint venture with State Forests, the effluent is used to irrigate surrounding forest plantations.

To date no precautionary discharges into the Camden Haven River have been required.

Sludge Treatment

Sludge generated from Kew/Kendall WwTP is collected in two sludge lagoons on site, which hold the sludge and allow it to settle whilst any water released from the process is returned to the IDEA tank to be treated. 

Like all organic solids produced by wastewater treatment in the Hastings, the biosolids from Kew/Kendall are transported to the Cairncross composting facility to be incorporated into compost.

This page was last updated on: 22 November 2019