Part of the 2002 upgrade was the intallation of 3 new clarifiers. |
Project Description
The Pukete Wastewater Treatment Plant is Hamilton City’s only wastewater treatment facility.
In order to ensure the plant meets the needs of Hamilton City, both now and into the future, an upgrade is required. It is envisaged that the Pukete 2 upgrade will provide for the quality, capacity and security of Hamilton City’s wastewater treatment for the next 20 years. |
|
Clarifier Pipework |
Wastewater Treatment Plant History
The Wastewater Treatment Plant was built in 1975 as a Primary Treatment facility. The Plant underwent a major $28M upgrade commissioned in 2002 providing Secondary and Tertiary treatment. The 2002 upgrade was designed and built utilising a modular concept approach enabling future capacity/enhanced treatment upgrades to be added in the future.
The Resource consent for the discharge of treated wastewater expired last year and a new resource consent has been granted for 20 years.
A Capacity Review of the plant was commissioned and completed by Montgomery Watson Harza (MWH) in 2003 This outlined future requirements for the plant to ensure planning for future capacity and ongoing resource consent compliance. This Capacity Review was updated in March 2007 and also assessed the requirements of the then proposed new resource consent conditions.
It was out of this capacity review that the need for a plant upgrade was identified. |
|
Bioreactor Wall Construction
Bioreactor Structure – Central Walls Constructed
Bioreactor
Clarifier Drainage Trenches Installed
Clarifier Floor Slab Steel Construction
Bioreactor Structure Oct – All Internal Walls Complete
 Completed Completed Bioreactor Tank
 ComCompleteCompleted Completed Clarifier Tank
|
Project Progress
Clarifier & Bioreactor Civil Construction
August 2009
Over the past month some significant project milestones have been reached, particularly on the clarifier site. The final wall panels have been erected, completing the circular clarifier shell. This allows the contractors to begin post-tensioning of the clarifier, a process which involves pulling steel tendons through ducts in the precast wall units, and stressing these tendons to provide required wall strength. Inside the clarifier, final floor slab steel is currently being tied, and concrete placement for these remaining slabs will begin upon completion of the wall post-tensioning. All is on track for installation of the mechanical clarifier equipment as planned in September/October.
On the bioreactor site, more wall pours have been completed over the last month, and this will continue in conjunction with walkway construction over the upcoming month.
September 2009
Over the past month on the clarifier site wall post-tensioning has been completed , and all 8 of the floor slab wedges have been poured. Work is continuing with construction of the final floor slab concrete infill sections and erection of the launder troughs on the precast walls. More process pipework connections are also being completed. Installation of the clarifier mechanism is due to start early October, with a view to being complete and available for testing in November.
On the bioreactor site, work is continuing with construction of concrete walls and walkways, and civil works on this site are on schedule to be complete by the end of this year.
October 2009
Some significant project milestones have been reached in the past month, despite the generally wet and unpredictable spring weather. With the clarifier, the tank structure is now complete, with backfilling around the structure also complete. The inlet pipework connections have also been established, leaving just the outlet connections remaining. Installation of the clarifier mechanical equipment is also underway. Over the next month, the remaining launder units will be erected inside the tank and pipework connections will be completed, allowing for testing to be undertaken from late November.
With the bioreactor, all internal walls have now been completed, and some walkways have also been poured. Over the upcoming month, the contractors hope to complete all remaining walls and most of the walkways, ready to proceed with testing from early December.
The contractors are currently on schedule to have completed the civil construction before the New Year.
November 2009
Over the past month steady progress has been maintained on both the clarifier and bioreactor sites.
All clarifier process pipework connections have now been established, and erection of the mechanical equipment inside the clarifier tank is almost complete. The final task to be undertaken in the claririer is the application of the sealants.
With the bioreactor, works have been continuing with casting of walls and walkways. This work will continue over the next month, along with erection of handrails and platforms.
The contractors are targeting beginning testing of the clarifier and bioreactor from early December, with a goal still to have completed the civil construction by the end of the year.
December 2009
Seasons greetings! The end of the year is upon us, and civil construction of the new bioreactor and clarifier is almost complete. All structural concrete works are complete in both the Bioreactor and Clarifier, and the clarifier mechanism has been installed and commissioned through dry testing. In the new year, final touching up of the concrete structure and installation of remaining handrails on the bioreactor site will be completed, and water testing of both the bioreactor and clarifier will be undertaken. Final site works will also be completed.
There will be a construction break from Wednesday 23rd December to Monday 11th January, but the contractors plan to be complete by the end of February 2010, well ahead of the contractual completion date in April 2010.
February 2010
Thanks to some fine weather over the summer period, civil construction of the Bioreactor and Clarifier is complete! The clarifier has been water tested and has been operational since 3rd February. The Bioreactor has been water tested, and is now ready for its Mechanical and Electrical fit-out, which will be completed over the next 2-3 months. Site works have also been completed, and Spartan Construction are in the process of demobilising from site.
The project team would like to thank you for your consideration during the construction of the Clarifier and Bioreactor. |
