Works Commence for Ti Tree Bend Sewage Treatment Plant Upgrade

TasWater has awarded Aquatec Maxcon a contract to upgrade both Digester No.1 and No.2 at the Ti Tree Bend Sewage Treatment Plant in Launceston, Tasmania.  The project will provide improved public health and environmental compliance, whilst ensuring reliable service delivery for the region and future generations.

The digesters play a critical role in the sewage treatment process by treating collected solids and producing a by-product suitable for re-use as agricultural fertiliser.

The upgrade will include a range of measures to minimise the potential for odour emissions and improve digester heating and mixing.  The works will include the introduction of recuperative sludge thickening and sludge dewatering, as well as improved bio-solids handling facilities for Digester No.1 and 2. Recuperative thickening increases sludge retention time and thereby improves sludge retention. The objective is to run the digester contents at less than 3.5% dry solids. The heating system will also be upgraded to improve the efficiency of the overall system during winter. This requires a number of mechanical and electrical key interfaces to the existing brownfield site. In particular, the modifications of the control system (SCADA) and PLC during plant shutdowns (whilst the existing digesters continue to operate).

By project completion, both digesters will have the flexibility to operate in parallel or in series, improving the flexibility and operability of the treatment system.

Aquatec Maxcon is proud to have completed over 50 digester installations throughout Australia to date. We have invested over $20 million in research and development and work with internationally recognised leaders in digester mixing and heating technologies.

Aquatec Maxcon has commenced construction on site with project completion scheduled for August 2018.