Narrogin WWTP Upgrade - Trickling Filter & Wetland

One of Australia’s lowest energy sewage treatment upgrades, The Water and Carbon Group’s solution comprises a new advanced plastic media trickling filter, and a 20,000m2 high-density treatment wetland. The plant will use approximately 50% less energy than activated sludge plants with equivalent performance.

Project Summary

The Water and Carbon Group designed and constructed the Narrogin WWTP upgrade involving a 300m3 plastic media trickling filter and a 20,000m2, high density constructed wetland. 

Narrogin is a town of approximately 4,500 people, located in the Western Australian wheat-belt, 2.5hrs southeast of Perth with a temperate climate of cold rainy winters and warm dry summers. 

150000

Kwhsaved over the course of a year

20000

m2high density constructed wetland implemented

50

%reduction in energy usage

Project Summary

The Water and Carbon Group designed and constructed the Narrogin WWTP upgrade involving a 300m3 plastic media trickling filter and a 20,000m2, high density constructed wetland. 

Narrogin is a town of approximately 4,500 people, located in the Western Australian wheat-belt, 2.5hrs southeast of Perth with a temperate climate of cold rainy winters and warm dry summers. 

Solution

The tertiary treatment design incorporated a 2 Ha constructed wetland planted with a range of native wetland plants. The final result of this system is a passive WWTP that provided significant energy savings over conventional upgrades.

2ha wetland in the early construction phases
2ha wetland in the early construction phases

Outcomes

Completed in 2016, the Narrogin WWTP requires minimal energy while reducing Total Nitrogen discharge by 80% and Phosphorous by 50% without pre-treatment and Suspended Solids and BOD compliant with licence conditions. The improved performance was achieved without adding operational costs.

The Narrogin WWTP upgrade is a demonstration of how Water Utilities can achieve high performance upgrades to existing treatment plants using ecological, passive processes.

Testimonial

The Water Corporation is proud of the innovative solution implemented in Narrogin by The Water and Carbon Group. The trickling filter and wetland system is a benchmark for regional treatment plants nationally. It is one of the lowest energy using sewage treatment plants in WA producing tertiary treated wastewater, dramatically reducing the nutrient load to the receiving environment. I highly recommend this approach to other water utilities seeking energy efficient alternatives to traditional treatment and disposal options while delivering strong environmental outcomes."

- Sue Murphy, CEO of Water Corporation WA (2008-2018).

150000

Kwhsaved over the course of a year

20000

m2high density constructed wetland implemented

50

%reduction in energy usage

2ha wetland in the early construction phases
2ha wetland in the early construction phases
Trickling filter construction and assembly
Trickling filter construction and assembly
Established wetland shortly after project completion
Established wetland shortly after project completion

Creating a lasting positive impact on the environment.

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