Smart and reliable solutions
SUEZ water & treatment solutions
smart solutions for
the environmental
sustainability
Level 3, 3 Rider Boulevard
PO Box 3246 Rhodes NSW 2138
Australia
Tel: +61(0)2 8759 7900
Fax:+61(0)2 9332 6882
www.suez.com.au
TYPE OF
CONTRACT
seaview
wastewater
treatment plant
Design, Build
and Operate
CAPACITY
53 MLD
CONTRACT
DURATION
D&B: 1999 – 2002
O&M: 2000 - 2020
seaview
wastewater
treatment
plant
NZ
ESTIMATED
POPULATION
SERVED:
146,000
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Hutt Valley
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improving marine and
coastal environment
TECHNICAL INFORMATION
In the 1990s, Hutt City Council investigated the
improvement of the marine and coastal environment
of Wellington’s southern coast. To achieve this, it was
identified that the existing Wainuiomata Wastewater
Treatment Plant needed to be replaced and wastewater
from Wainuiomata Valley needed to be transferred to a new
plant through a pipeline connecting the two valleys.
Microscreen
> 3ADWF
> 2ADWF
Primary SedimentationTanks
Contact Stabilisation
Secondary Clarifiers
UV Disinfection
Effluent Pumping
Pencarrow Head
SEWERAGE SYSTEM
- HUTT VALLEY
The new wastewater treatment plant needed to meet
stringent effluent quality requirements to cleanse
Wellington’s southern coast and reduce discharge to
Wainuiomata River.
In 1999 Hutt Valley Water Services (HVWS), a subsidiary of
New Zealand Water Services (fully owned by SUEZ Australia
& New Zealand) alongside OMI Beca, was engaged to
design, build, operate and maintain the new Seaview
Wastewater Treatment Plant for 20 years.
Return Activated Sludge
Primary Sludge
WAINUIOMATA
VALLEY
Through listening to the client’s needs and drawing on
our experience in wastewater treatment, SUEZ developed
smart solutions to help improve the coastal areas. Since the
plant was commissioned in 2002, the marine and coastal
environment of the south coast and harbour entrance has
vastly improved. In addition, discharge to the Wainuiomata
River has ceased, returning the water to its natural state.
Waste Sludge
Gravity
Thickener
TO LANDFILL
Dissolved Air
Flotation
Storm Tank
Scum
Odour Treatment Biofilters
providing water solutions for the
seismic area
ADWF
PST
GT
BT
DW
TD
Air From Process Units
(PSTs, GT, BT, DW, TD)
Wellington lies along an active seismic fault in the south of
New Zealand’s North Island. It is a dextral strike-slip fault
with variable amounts of vertical movement causing uplift
to the northwest. Therefore, a design enabling the plant to
continue to operate under stress conditions was required.
Average Dry Weather Flow
Primary Sedimentation Tank
Gravity Thickener
Blend Tank
Dewatering
Thermal Dryer
Blend Tank
Listening and understanding the client’s concern, SUEZ
and our partners designed wastewater tanks to remain
intact during an earthquake, reducing the chance of
wastewater spilling into the harbour and minimising
operational disruptions.
Thermal Dryer
DRIED BIOSOLIDS TO
BENEFICIAL USE
Centrifuge Dewatering
community - the heart of our design
The plant is situated in a semi-industrial area which
is close to commercial properties, therefore the odour
emission from the facilities was a key focus from the start
of the project. Tanks and equipment that release odours
are covered and ventilated, as well as the odour treatment
facility to help ensure that the health and safety of the
neighbours and environment in the area are not affected.
WATER CHARACTERISTICS
The sludge from the wastewater treatment line is treated
through a drying facility to produce a pathogen-free
pelletised product for horticultural reuse.
flexibility for continuity
Dextral strike-skip fault
In preparation for future population growth and to help
ensure the continuity of operation, the plant is designed
to be flexible for upgrading capacity of up to 50% to serve
more residents.
Population served
146,000 residents
Average flow (MLD)
53
Average dry weather flow (MLD)
42
Typical wet weather flow (MLD)
65
INLET
OUTLET
BOD (g/m )
180
8
Total suspended solids (mg/L)
200
14
Faecal coliforms (CFU/ml)
1 x 106
100
3
The plant design allows process units to work
independently, enabling the plant to continue operation if
one unit is taken offline.
BOD = Biochemical Oxygen Demand
SUEZ Water & Treatment Solutions
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SUEZ Water & Treatment Solutions
MLD = mega litres per day
SUEZ Water & Treatment Solutions
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