yarra valley water stormwater harvesting projects · 18 july 2011 yarra valley water ltd 14 coburg...
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18 July 2011 Yarra Valley Water Ltd 1
Yarra Valley Water Stormwater Harvesting Projects
Asoka Jayaratne
Water Quality Specialist
12 May 2011
Merrifield and Coburg Developments
400Ha industrial/commercial site
zoned comprehensive development zone (CDZ2)
being developed by MAB Corporation
Potential recycled water users:
> 3,655 apartments
> 345 houses
> 33 Ha of public open space
Merrifield (Kalkallo) Stormwater Harvesting Project
UGB – Northern Investigation Area
Kalkallo
Wallan
Greenvale
Craigieburn
Epping North
Mernda / Doreen
Whittlesea
Yan Yean
Reservoir
Greenvale
Reservoir
Western Water
Yarra Valley Water
Investigation Area
Boundary
Current Urban
Growth Boundary
Where is Merrifield Industrial Development?
Merrifield Development
(410Ha)
Folkestone Development
(320Ha)
Kalkallo
Township
Relative Size Of The MCG
(1/18 Of The Catchment)
Wallan
Melbourne
What Does The Development Site Look Like Now?
Photo taken prior to completion of Donnybrook Road overpass
(now completed)
Donnybrook Road
N
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18 July 2011 Yarra Valley Water Ltd 2
What Will It Look Like At Full Development?
The development will predominately include office, warehousing
and logistics, and light manufacturing industries
The wetland will be a key feature of the development
N
Where Will We Collect Stormwater From?
Merrifield Development
(410Ha)
Folkestone Development
(320Ha)
160Ha Catchment Area
We Will Collect
Stormwater From
Kalkallo
Township
Wallan
Melbourne
STEP 1
Street drains collect rainfall and
direct it to a series of treatment ponds and wetlands which
remove pollutants
STEP 2
The partially treated rainfall
enters a large wetland for further pollutant removal
STEP 3
The wetland overflows into a
large open storage dam
Main Wetland
Overflows To Creek
Storage Dam
STEP 4
Stormwater is pumped from the
storage dam into a state of the art treatment plant which is
capable of producing a drinking
water quality product
STEP 5
The treated water is stored in a
tank and tested to prove it has met the required treatment
standard
STEP 6
Once the quality is confirmed,
the water is released into supply
Release Into Supply
How Will It Work?
Stormwater
Tre
ated
Wat
er
Wetlands and
treatment ponds
Tanks where water
is stored and tested
prior to release
Dilution with
existing water
supply
Development
Storage dam
Lamella Plate
Separator
Advanced Oxidation
& Chlorination
Coagulation /
Ultra-filtration
Reverse Osmosis
Stormwater Treatment Plant
How Will We Manage The Risks Of Contaminating The Drinking Water Supply?
Coagulant
Ultra-filtration
Reverse Osmosis
UV / Advanced
Oxidation
Chlorination
Alkali addition
Fluoridation
Batch Tank
Lamella Plate
Separator
B4, V4, P4
B3, V3, P0
Proposed treatment process:
• Bacteria = 10 log
• Viruses = 8 log
• Protozoa = 7 log
Normal Class A process:
• Viruses = 7 log
• Protozoa = 6 log
What Does the Planned Treatment Process Look Like?
CATCHMENT
SUPPLY
Wetlands and storage basin
(aerated storage)
B1, V1, P1
B2, V0, P2
Removes Algal Solids to Protect UF
Pre-validated to reduce virus & protozoa.With coagulation will remove colour, P, and Heavy metals to low concentrations.
Pre-validated to reduce virus & protozoa.Removes trace organics, taste, odour, color.Removes salt, heavy metals, N & P.
Pre-validated to reduce protozoa. Removes trace organics – pesticides & pharmaceuticals.
Pre-validated to reduce bacteria & virus.
Where do we get the LRV?Process
step
Critical limit value LRV Possible Virus LRV
(validated)
Protozoa
LRV
(validated)
Bacteria LRV
(validated)
Wetlands/
Storage dam
0.5 0 0 0
Coag-UF Pressure Test 4 or 3 (cost
both)
4 4
RO EC, TOC,
Fluorescence (new
tech), measure
concentrate
2 to 6 0 (but could be
better with new
tech)
UV-AOP
H2O2
Defined from
Chem assessment
2 to 4 (cost
options)
4 4
Cl2 4 0 4
Total 9 to 12 8 12
Required
Class A
3 3 3
Required
Potable
6 6 618 July 2011 12Yarra Valley Water Ltd
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18 July 2011 Yarra Valley Water Ltd 3
Overview of Hazard Screening
� Tier 1 Screening – Hazard Identification through major
lit review ( ~ 3000)
� Tier 2 Screening. Filtering based on:
• Chemical attributes (~ 1500 )
• Presence in Australia (~700)
� Tertiary Screening: Additional filters based on likelihood
of presence and expert opinion
� Residual hazards to control and/or monitor (≈ 100 ?)
� > 55,000,000 substances registered to date
� >100,000 substances in industry
and commerce – Many potential
stormwater contaminants
Filtering Results
18 July 2011 14Yarra Valley Water Ltd
Coburg Principal Activity Centre
Stormwater Harvesting And Reuse Project
Issues
� Every developer wants to do something different:
• Small to large scale stormwater harvesting proposals
• Building scale black/grey water treatment plants
� YVW is best placed to deliver a whole of PAC solution:
• Economies of scale
• Water company experienced with management and operation of
similar schemes
• More likely to be able to source necessary funding
Coburg Stormwater Harvesting Project – Areas To Be Serviced
Potential recycled water users:
> 3,655 apartments
> 345 houses
> 33 Ha of public open space
Stormwater
Storm
water
Storm
water
Recycled Water
Underground
stormwater
storage tank
Ultra filtration
using
membranes
Rec
ycle
d W
ater
Tre
atm
ent
Pla
nt
Above ground
storage tank Development
(new and existing)
Merri Creek
Flow
diversion and
screening for fats,
greases, oils and
large solids
Existing
drainage
system
(pipes)
Stormwater
UV disinfection
Rec
ycle
d W
ater
ChlorinationScreens to
remove fine
solids
Schematic Of How Stormwater Will Be Harvested And Reused
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18 July 2011 Yarra Valley Water Ltd 4
Impact On McDonald Reserve And Surrounds
Underground
Storage Tank
(18ML)
Diversion 1
Diversion 2
Proposed Underground Storage Tank Solution
Considering the use of the “Humes Stormtrap” product or equivalent
Reinforced concrete box culverts laid on top of each other
Provides incredibly strong structure with 100+ year lifespan