Moa Point before sewage treatment
There are two sewage treatment plants in Wellington - Moa Point and the Western Treatment Plant (Karori) - and a sludge treatment plant at the Southern Landfill.
The Council also has a 27.6% share in the Porirua Treatment Plant which treats sewage from Wellington's northern suburbs.
The Council contracts United Water International to operate Wellington's three treatment plants.
Resource Consents
The Moa Point Treatment Plant was granted new consents on 11 May 2009. These consents will continue for 25 years (expire 11 May 2034).
The Western Treatment Plant was granted new consents on 28 July 2010. These consents will continue for 25 years (expire 28 July 2035).
The Sludge Treatment Plant was granted new consents in May 2012.
Waste Treatment Process
Moa Point after sewage treatment
At the Moa Point Treatment Plant, sewage travels through a series of screens, tanks, bioreactors, clarifiers and ultraviolet treatments before being discharged as liquid into Cook Strait.
- Non-organic - large, non-organic materials such as toilet paper are first removed using screens. This rubbish is washed and compressed and sent to the Southern
Landfill for disposal.
- Solid sewage (sludge) - as sewage travels through sedimentation tanks, the majority of solids are removed. This sludge is taken to the Southern Landfill Sludge
Treatment Plant where it is de-watered (water removed from solids).
- Effluent - a series of tanks and bioreactors use a combination of sedimentation and bacteria to decompose almost 70% of carbonaceous material. Remaining liquid effluent is exposed to ultraviolet light to destroy any harmful bacteria. The treated liquid is finally discharged, through a long outfall, 1.8km into Cook Strait.
Related Links
Department Details:
Capacity Infrastructure Ltd
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