ntu-hdb joint research workshop...ntu-hdb joint research workshop . master lab (r&d clusters)...
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NTU-HDB Joint Research Workshop
Introduction
Objectives
Pilot Implementation and Current Practice
@ Punggol
Pilot Implementation @ Jurong
(Retrofitting)
Integrated System
Potential Research Area
NTU-HDB Joint Research
Workshop
Master Lab (R&D Clusters)
Energy Urban Greenery
Water & waste
Living Env
Building Tech
Reduce the amount of potable water
used for landscape irrigation and
building operations
Reduce reliance on the import of water from the
region
BJECTIVES Develop cost effective & sustainable rainwater harvesting system
Water & Waste
Storage
Tank
Treatment
System
Roof
Top most Storey
Water Usage
Roof level
Pilot Implementation
M
Water Usage
PUB Top Up Water
Treatment System
(membrane)
Roof Level
Inlet grating
Motorised valve
Storage Tank
Recirculation Pump
OFF
OFF
ON
ON
Rainwater Harvesting System @Punggol
Using Gravitational Force
Roof
Top most Storey
Storage Tank
Treatment Room
2nd Top most Storey
Current Practice
Main Usage
(a) Washing of common areas
- Staircases
- Void decks
- Common corridors
(b) Irrigation of plants
Introduction
Objectives
Pilot Implementation and Current Practice
@ Punggol
Pilot Implementation @ Jurong
(Retrofitting)
Integrated System
Potential Research Area
NTU-HDB Joint
Research Workshop
Point Blocks (In red)
Slab Blocks (In purple)
Point Block Existing downpipe
Slab Block
Collection & Storage Tank + Treatment system
Collection & Storage Tank + Treatment system
Roof
Roof
Collection Tank Storage Tank
Treatment System
Manhole Manhole Overflow pipe Overflow pipe
Drain pipe
Water usage
Drain pipe
Rainwater Downpipe
Level Switch The system is operated by the level switch
Collection & Storage Tank + Treatment System @ Void decks
Collection Tank Storage Tank
Treatment System
Manhole Manhole Overflow pipe Overflow pipe
Drain pipe
Water usage
Drain pipe
Rainwater Downpipe IMPROVE
COST EFFECTIVENESS
Introduction
Objectives
Pilot Implementation and Current Practice
@ Punggol
Pilot Implementation @ Jurong
(Retrofitting)
Integrated System
Potential Research Area
NTU-HDB Joint Research
Workshop
Collection & Storage Tank + Treatment system
Storage Tank + Treatment system
Retention Tank Detention Tank
Ground
Level switch
L1
Rainwater outflow to PUB’ s roadside drain
Submersible Pump to treatment from retention tank
Electric valve
Overflow pipe
washing of common corridors/void decks of different blks
Detention Tank Rainwater
retention tank
ON
Surface runoff
Rainwater channeled from rooftop
Treatment room
Storage Tank
Treatment Room and Storage Tank
Submersible Pump to treatment
Treatment System
(membrane technology
or equivalent)
Centralised storage tank 10m3 Tank
Backflush
Reject
1. Minimum rain water quantity a need to promote high recycled amount
2. Quality of treated water
3. Availability of ground level/underground space to have the treatment system within the detention tank (?)
4. Cost effectiveness of the system
5. Ease of maintenance and cleaning works
Area of concerns
To identify the minimum water quality
for rainwater harvesting reuse
To minimize maintenance and cleaning
works
To optimize treatment quality
for better cost effectiveness
Potential Research
Area
Ground level
Level switch
L1
Overflow pipe
Electric valve
Submerged Membrane
Retention Tank
Filter Oil separator
~2m
Detention Tank
Surface runoff + Rainwater channeled from rooftop
Storage Tank
Retention Tank
Water drawn in via suction
Filtered water
Overflows to the detention tank
Permeate pumped to surface via permeate pump (fitted in the membrane) Max Height of 2m
FILTER
Debris is removed via
discharge overflow pipe
Discharge overflow pipe
Submerged Membrane
Membrane: Self-cleaned via backflush
Filter: Self-cleaned via backflush
nozzle