Maleny Wastewater Treatment Plant

How the treatment system works

The treatment process begins at the plant, where an immersed membrane bioreactor (iMBR) filters out solids and contaminants from wastewater to produce high-quality treated water.

Originally, the treated water was used to irrigate 13.8 hectares of nearby forest, where native vegetation and soils absorbed remaining nutrients and helped improve water quality – creating a natural extension of the treatment process. The forest is now well established and self-sustaining, with irrigation no longer required.

Today, a significant proportion of treated water is used to irrigate the course at Maleny Golf Club, while the remainder flows through the three hectares of constructed wetlands where vegetation and algae help remove any remaining nutrients – further improving water quality before the treated water reaches Obi Obi Creek.

Management of the wetlands includes the use of an innovative treatment product called Diatomix, a non-toxic nano-silica mixture that encourages the growth of diatoms – beneficial microscopic algae that help remove nutrients and limit the growth of nuisance algae and aquatic weeds. This also helps improve water quality and supports the overall health of the wetlands.

The forest and wetlands provide important habitat for native wildlife and contribute to the environmental and recreational value of the Maleny Community Precinct. We've partnered with Barung Landcare on native vine plantings in the surrounding forest to help restore habitat for the vulnerable Richmond Birdwing Butterfly and endangered Pink Underwing Moth. These plantings are now well established, further supporting the area's biodiversity.

We also work closely with Healthy Land & Water on the ongoing management of the wetlands, supporting environmental performance and visitor safety.