Waste Water Treatment Plants
Hutt Valley Water Services (HVWS), a subsidiary of OMI Beca and New Zealand Water Services, was commissioned to design, build and operate the Hutt Valley Waste Water Treatment Plant.
Completed in 2002, the Plant is an impressive, efficient and cost-effective state-of-the-art waste-water solution meeting the local community's current and future needs. Integral to the plant is a thermal drying facility (currently the largest in New Zealand) that dries all the dewatered blended sludge into a pathogen free pelletised product suitable for horticultural applications.
The Contract is delivering the following benefits:
- A cleaner coastline and Wainuiomata River - the higher quality discharge at the Pencarrow outfall has significantly improved the local and marine coastal environment greatly increasing the recreational value of this scenic area of the Wellington coastline. The removal of treated effluent from the Wainuiomata River has greatly improved the water quality in one of Wellington's prized trout fishing rivers.
- Energy efficiency – a limited hydraulic gradient drives waste water flows through the treatment units and around the entire plant without the need for power driven pumps.
- In-built flexibility – the plant's structure incorporate the latest seismic engineering, with waste water tanks being designed to withstand earthquakes avoiding spills into the harbour and ensuring minimal disruption to operations.
- Lower fixed costs in the long term for HVWS's clients. The Design, Build, Operate (DBO) concept provided a very competitive capital works solution as well as optimizing risk and long term operational costs.
- Integrated approach to the operation and maintenance of the trunk collection network and the waste water treatment plant.
|Hutt Valley Water Services, Petone, New Zealand|
|Project||Waste Water Treatment Plant and Trunk Collection System (20 pump stations)|
|Client||Lower Hutt and Upper City Councils|
|Contract||Design, Build and Operate|
|Contract Period||20 years|
|Estimated Population Served (EP)||160,000|