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Ngāruawāhia Water Treatment Plant Upgrade

Waikato District Council


2011 - 2012


Upgrade of chemical storage, dosing & floc facilities, removal of existing aeration filter tray and increasing existing pumps capacity. Installation of a filter inlet weir box, pipelines, instruments and control valves.

This Project involved the upgrade of the existing Water Treatment Plant in Ngaruawahia. The upgraded plant was required to increase the treated water throughput to 4.5MLD as well as meeting compliance guidelines set by the Drinking Water Standards of New Zealand.

Works included:

  • Construction of a new flocculation tower

  • Improved storage and dosing facilities for all chemicals.

  • Improved coagulation/flocculation facilities to improve WTP performance.

  • Increased capacity from the clarified water pumps by increasing the motor size from 30kW to 37kW.

  • Removal of the existing filter aeration tray.

  • Installation of a new filter inlet weir box to control the flow split to the three filter inlets.

  • New filter backwash, washout, outlet and filter to waste pipework. The pipework includes installation of numerous instruments and control valves.

  • New PLC, MCC and electrical wiring for the main plant building and filter area.

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