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Waiouru (Army Base) Wastewater Treatment Plant Upgrade

New Zealand Defence Force

CLIENT:

2013

YEAR:

Upgrade of an existing wastewater treatment plant including two new reinforced concrete SBR tanks, chemical dosing system, UV disinfection and associated pump cambers, pipework, mechanical and electrical works. Also included was the refurbishment of the existing trickling filters, clarifiers and digestor.

Refurbishment of primary and secondary clarifiers, trickling filters, an anaerobic digester and sludge drying beds. This upgrade took place whilst the plant continued to operate 24-7, without hold-up.


Works included the construction of:

  • Reinforced concrete twin SBR tank system with sludge pumps, decants, diffusers, Mixers and valves.

  • SBR Feed and Trickling Filter recirculation pump stations and new splitter manhole.

  • Two MCC rooms and three boards.

  • Generator Site.

  • UV Pit and new UV unit.

  • Flow meter chambers.

  • Blower room.

  • Access roading to the site.


And the refurbishment or upgrade of:

  • Primary and secondary clarifiers.

  • Trickling filters.

  • Sludge digester & drying beds (to geo-bag sites).

  • Electrical works throughout the entire plant.


Innovation

  • The use of DOKA formwork to construct the reinforced concrete tank insitu to speed up the construction process.

  • Re-using all of the existing plant arms and structures to save on costs.

  • Rebuilding the Trickling Filter arms like for like as an unpowered item.

  • Removal of the existing unsafe Digester lid and replace with a new more easily accessible lid.

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