Horseshoe Bay WWTP

Client:

Citiwater, Business Unit of Townsville City Council

(Water Matters Alliance)

Location:

Horseshoe Bay, Magnetic Island

Service:

Greenfield site, re-use

Value:

-

Completion Date:

2006

After 3 ½ years of successful operation at Picnic Bay, Citiwater in conjunction with the Water Matters Alliance selected a Kubota MBR system as the preferred option for a new wastewater treatment plant at Horseshoe Bay to meet the stringent discharge requirements.

Solution
A MLE Process utilising a Kubota MBR system was installed to meet low nitrogen, phosphate and pathogen limits. Alum was dosed to meet the low Phosphate requirements.
Kubota membranes have a nominal pore size of 0.4µm and an absolute pore size of 0.01µm, which provides an absolute barrier to biomass, and pathogens retaining them within the process tank.

Process Overview
The raw water first passes through a 3mm fine screen into a bioreactor. The bioreactor consists of 3 stages – two denitrification tanks, followed by the MBR tank. Filtration is achieved by drawing effluent through the surface of the flat sheet membranes under a gravity head. No suction pumps are required.

The effluent from the plant is reused to irrigate a dry tropical forest parkland or discharged to the Great Barrier Reef Marine Park.