Posted by: admin November 11, 2015

PROJECT DESCRIPTION:

Stage 5 of the overall upgrade of the Coombabah and Elanora wastewater treatment plants was aimed at increasing treatment capacity and to provide anaerobic sludge stabilisation. Allconnex Water engaged Abergeldie to design, supply, install and commission process equipment to replace two existing gravity drainage decks at Coombabah with three new ones, and to demolish and replace one existing gravity drainage deck at Elanora. New polymer storage, batching, dosing and static mixers were also required at Coombabah.

Complex Challenges:

The two plants are approximately half an hour away from each other, allowing the works to be managed under a single contract and project management plan.

Strict performance standards were specified, both for individual equipment elements and for the overall process outcome. For example, the sludge thickeners were required to produce a thickened sludge with a consistent dry solids content of 5 per cent. The polymer usage rate was also specified, based on a defined kg/tonne of dry solids.

As the project progressed, it became evident that upgrades were also needed to several other existing process elements related to the new systems, and that some redesign would be required to manage interfaces. Close liaison with the head contractor, other sub-contractors and the plant management personnel is necessary to coordinate interrelated works.Design, Supply three BFP, Polymer system, Civil and Electrical works at Coombabah & Elanora WWTP.

Posted by: admin

PROJECT DESCRIPTION:

As part of a broader upgrade by Allconnex Water for Gold Coast City Council, Abergeldie was appointed to prepare detailed designs and specifications and carry out construction work and installation of new airlines and associated equipment for the Coombabah wastewater treatment plant’s existing aeration basins E and F.

Complex Challenges:

All works were carried out under brownfield conditions on a continuously operating wastewater treatment plant. Other packages of works were also being carried out at the same time by other contractors working on nearby elements of the same plant. Communication protocols between construction, subcontractor and plant operations teams were agreed at project initiation to minimise risks of conflict. Clear delineation was made between the working areas of all parties, with no go areas fenced off and entry strictly controlled. Aeration tanks E and F were isolated from the rest of the plant throughout the construction and installation phases, and cut in to the existing plant during a strictly scheduled time window to prevent interruption to the continuous operation of the overall plant.