ntu-hdb joint research workshop...ntu-hdb joint research workshop . master lab (r&d clusters)...

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