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Luggage Point Sewage Treatment Plant Bioreactor Refurbishment

Urban Utilities engaged Abergeldie for the design and staged construction of replacement of diffusers and refurbishment of aeration lines, valves, and degraded concrete in six bioreactor tanks at the Luggage Point Sewage Treatment Plant.

Client

Urban Utilitites

Year

2018

Region

QLD

Scope of Works

Repairs to chemical dosing systems
Replacement of fine and coarse bubble diffusers
Replacement of isolation valves with new stainless steel units
Motifications to control systems
Installation of new aeration grids in the post-anoxic zone
Grit blasting and recoating of aeration lines
Cleaning of concrete and metal surfaces
Condition assessment of cleaned concrete and metal surfaces
Remediation of degraded hydrostatic concrete surfaces
Electrical upgrades
Renewal of flow meters

Complexity

Works are being undertaken under a complex, long-term, staged program to take each of the six bioreactors off line for refurbishment one at a time, to accommodate continuous operation capacity issues with the plant. Planning and executed requires close cooperation with the plant operations team.

Survey systems are set up on each tank to monitor deflection and vibration as the overall array is hydrostatically out of balance as each tank is emptied to enable internal works. Readings from the survey instruments are relayed to an off-site station where they can be monitored in real time.

All works within the bioreactors are being carried out under confined space conditions.