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14-1087 Katikati Wastewater Treatment Plant Hydraulic Upgrade


Tender Closed
RFx ID : 9914485
Tender Name : 14-1087 Katikati Wastewater Treatment Plant Hydraulic Upgrade
Reference # : 14/1087
Open Date : Friday, 13 March 2015 1:00 PM (Pacific/Auckland UTC+13:00)
Close Date  : Thursday, 2 April 2015 12:00 PM (Pacific/Auckland UTC+13:00)
Tender Type : Request for Tenders (RFT)
Tender Coverage : Sole Agency  [?]
Categories :
  • 83101500 - Water and sewer utilities
  • Auckland
  • Bay of Plenty
  • Manawatu-Wanganui
  • Taranaki
  • Waikato
Exemption Reason : None
Required Pre-qualifications : None
Contact : Graeme Brown
Alternate Physical Delivery Address  : Tenders Close at "The Tender Box" Western Bay of Plenty District Council, Private Bag 12803, Tauranga 3143
Alternate Physical Fax Number  :

The upgrade works include:
1. The installation of a new overflow weir into the southern manhole chamber between the primary ponds and an in-series reconfiguration of the ponds to operate the western pond followed by eastern pond.
2. The supply and installation of floating protection curtains in the primary ponds to improve the settling and the retaining of solids.
3. The lifting of the wetlands’ inlet weir chamber and installation of new inlet distribution troughs.
4. The supply and installation of a new outlet collection system at the discharge end of the wetlands and its connection to the existing collection manhole. The removal of the existing concrete screen and discharge chambers and the fitting of isolation valves.
5. The lifting of the embankments of the primary ponds and of the wetland in certain areas to prevent overflowing at times of peak flows.
6. The modification of existing and installation of new breather pipes, breather holes and of the collection manhole to be able to operate the wetland at higher water levels.
7. The removal of the existing fence line along the western side of the wetlands and the relocation of some of it to the north of the wetlands. This is to allow better access for the operator.
8. The installation of a new automatic flow control valve, flow meter and flow controller to ensure stable and maximized flow to the UV plant and pumping station.
9. The modifications of the controls of the final discharge pump station to ensure stable and continuous operation independent of upstream flow conditions.
10. The installation of an emergency discharge line with flow meter and control valve from the final pumping station to the local drain.
11. Additional works to improve the operation of the treatment plant.
Some sections of the works will require the Contractor to work closely with a number of nominated subcontractors, who are specialised in their particular area of supply or work.
The overall works will increase the plant’s hydraulic capacity and prepare it for the installation of floating wetland rafts, which will be undertaken in a second upgrade step. The overall upgrade will ensure that the plant will cope with the high inflows and treat the effluent to the required standards all year round.