The Integrated Rainwater and Grey Water Management Project in Cebu, Philippines

Dr. Reeho Kim, Research Fellow

Mr. Rene Burt N. Llanto, Regional Director

2011 Low Impact Development Symposium

2011 Low Impact Development Symposium Loews Hotel, Philadelphia, Pennsylvania

September 25-28, 2011

Contents

Issues on water management1

Project description2

Future perspectives3

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1. Issues on water management

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Impacts of Urbanization1. Issues on water management

Water

Energy Climate

2~3% of total energy in the world : Use for secure and supply of water resources

Distorted Heat Cycle

Distorted Water Cycle

Urbanization

High Energy Consumption

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Changes in Climate Conditions

• Average annual rainfall has slightly increased over the last century

• Variations in annual rainfall have significantly increased

Annual rainfall

5-year average

Average (‘05-’03)

Variation trend

• Higher temperature• More rain• Extreme weather• Sea-levels are rising

Source: http://geology.com/news/labels/ Global-Warming.html

1. Issues on water management

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High energy consumptionwith green house

gas emissions

High energy consumptionwith green house

gas emissions

Conversion to system with low carbon and

high efficiency

Conversion to system with low carbon and

high efficiency

“Low carbon green growth is the national vision over the next 60 years” (Korean President)

• Energy conservation, recycling and clean energy development to build anenergy-saving economy

• Green transportation networks and clean water supplies to upgrade the quality oflife and environment

• Carbon reductions and stable supply of water resources to protect the earth andfuture generations

• Building of industrial and information infrastructures, and technologydevelopment to use energy efficiently in preparation for the future

Green Growth and Water Management1. Issues on water management

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waterManagement(Rain/Storm/Greywater)

Control of non-point source pollutants

Prevention of dry stream and urban flood

Alleviation in heat island

Reduction of energy consumption

Supply of additional water

Restoration of hydrological cycle

Considerations on eco-efficient water infrastructure

1. Issues on water management

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Greywater & Wastewater

Reuse

Rainwater & Stormwater Harvesting

Sustainability of annual flow rate

Emergence as the 3rd Water Industry

Secure alternative water resource

Solve environmental problem such as urban

flood and non-point pollution source

Need of advanced treatment

tech.

Lack of user’s

recognition

Continuous annual

productivity

Irregular rainfall pattern

Multi-functional

use

Economical treatment

tech.

Needs of combined utilization1. Issues on water management

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2. Project description

- The Integrated Rainwater, Stormwater and Wastewater Management Project in Cebu, Philippines-

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Introduction2.1 Background

Project definition Pilot activity for the Philippines to develop and install in a public building a system

capable of managing rainwater, stormwater and waste water treatment.

International cooperation UN-ESCAP (Water Security Section of United Nations Economic and Social Commission for

Asia and the Pacific), KOICA (The Korea International Cooperation Agency), KICT (The Korea Institute of Construction Technology), EREDE Co., Ltd. DOST7 (The Department of Science and Technology Region 7).

Objectives of the project To strengthen the capacities of local government officials for the planning and

management on the integrated rainwater and stormwater recycling system through the implementation of the pilot demonstration project To establish the model for integrated rainwater and stormwater recycling system in

the selected building to demonstrate the eco-efficient approaches for water infrastructure To promote awareness and advocacy on eco- efficient water infrastructure

development in the Philippines. 10/28

Outline of the project2.1 Background

•Site: DOST 7 Office Building, Cebu City, Philippines•Project cost: US$45,000 from ESCAP

Construction cost of the tanks supported by DOST 7MF system donated by EREDE co. Ltd.

•Project duration: 2009-2010 (12 months)•Information Source: http://www.ro7.dost.gov.ph/

China Japan

South Korea

PhilippinesVietnam

Taiwan

Cebu

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Process for the system construction

• Green filter• Storage tank• Micro-membrane filter system

• Ubiquitous Remote Management System

Design

Techs

Operate

• RainCityTM and Excel spread sheet• Decision Support System

Integrated rainwater,

stormwater, wastewater

Management

2.1 Background

• MBR

For rainwater & stormwater

For wastewater

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Rainwater & stormwater harvesting system2.2 System configuration

Design of the system•Rainfall data and simulation result

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•MBR system

2.2 System configuration

Catchment area : 1,500 m2

Rainwater tank : 60 m3

Stormwater tank : 60 m3

Treated water tank : 40 m3

Supply tank on a roof : 9 m3

First flush treatment device: W1,000×L1,500×H1,000 (Total 2set) MF system : 1 m3/hr

(10 hr operation/day) Wastewater treatment(MBR) :

10 m3/day (toilet flushing)

Outline of the system

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Pipe & Instrument Design(P&ID) of the system2.2 System configuration

Rainwater tank

Stormwater tank

MBR

Treatment tank

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2.2 System configuration

Green filter

Rainwater & stormwater harvesting system▪ Integrated system (Sedimentation and Filtration)

▪ No external power source is required

Removal capability of nitrate, phosphate, and heavy metals as well as particles

Filter media made of recycled wood : Environmentally friendly

Patent No. 0516951 “Treatment facility and method for runoff from building rooftop”

0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 25 45 85 145

Con

cent

ratio

n(m

g/L

)

Time(min)

Heavy Matals

Fe Cu Zn

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2.2 System configuration

Storage tank•60 ㎥ for rainwater, 60 ㎥ for stormwater

Rainwater & stormwater harvesting system

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2.2 System configuration

Micro-membrane Filter (MF) system

Rainwater & stormwater harvesting system

Micro-membrane filter system (MF system) is installed for treatment of rainwater to use in the building

Collected and treated rainwater is used for toilet and gardening

Specifications•Type: Hollow fiber•Material: PVDF (Polyvinylidene Fluoride)

•Out size: 0.65/1.0mm•Membrane space: 42㎡/module•Pore size: 0.2㎛

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Wastewater reuse system2.2 System configuration

• Membrane Biological Reactor (MBR) to treat wastewater• Reuse for toilet flushing and gardening• Released to the river for eco-system.

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Remote control and operating system2.3 Operation & Monitoring

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Operation result2.3 Operation & Monitoring

Samples pH1 TDS2 EC3 BOD4

Treated Rain /Storm Water 9.8 90 160 2

Treated Wastewater 8.0 540 1010 14

Date15 April 2011

1. pH: 6.0 to 9.0 for residential purposes

2. TDS: Total Dissolved Solids (mg/L)

3. EC: Electro Conductivity (MicroS/cm)

4. BOD: Biochemical Oxygen Demand (mg/L) - Effluent standard requirement : 30 mg/L - Normal quality for reuse : 5 mg/l - Department of Environment and Natural Resources (DENR)

Water quality

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Operation result2.3 Operation & Monitoring

Month

㎥

Monthly tap water consumption

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Policy and Social aspects2.4 Promotion

MOU between DOST and KICT

Awards from UNESCAP, Philippines, Vietnam

MOU, awards, training and guidebook

Training-Workshop : Focus on Integrated Rainwater & Stormwater Management

Guidebook

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Policy and Social aspects2.4 Promotion

Mass media

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3. Future Perspectives

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International cooperation & support

T&RAward of Recognition

the Philippines

Monre

Vietnam

Cooperation related to rainwater management

Maldives

Support technology of rainwater harvesting system

Indonesia MongoliaFuture:

3. Future perspectives

the Kingdom of Bhutan 26/28

Summary and vision3. Future perspectives

Eco-efficient water infrastructure

UrbanFlood Control

UrbanFlood Control

UrbanHeat

Control

UrbanHeat

Control

AdditionalWater Supply

AdditionalWater Supply

Integrated rainwater, stormwater & greywater Management

Adaptation of Climate Change Mitigation of the impact of urbanization

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Thank you