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

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1 2011 Low Impact Development Symposium 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 Loews Hotel, Philadelphia, Pennsylvania September 25-28, 2011

2 Contents 1 Issues on water management 2 Project description 3 Future perspectives 2/28

3 1. Issues on water management 3/28

4 Impacts of Urbanization 1. Issues on water management Distorted Water Cycle Water Urbanization 2~3% of total energy in the world : Use for secure and supply of water resources Energy High Energy Consumption Climate Distorted Heat Cycle 4/28

5 Changes in Climate Conditions 1. Issues on water management Average annual rainfall has slightly increased over the last century Variations in annual rainfall have significantly increased Higher temperature More rain Extreme weather Sea-levels are rising Annual rainfall 5-year average Average ( 05-03) Variation trend Source: Global-Warming.html 5/28

6 1. Issues on water management Green Growth and Water Management Low carbon green growth is the national vision over the next 60 years (Korean President) High energy consumption with green house gas emissions Conversion to system with low carbon and high efficiency Energy conservation, recycling and clean energy development to build an energy-saving economy Green transportation networks and clean water supplies to upgrade the quality of life and environment Carbon reductions and stable supply of water resources to protect the earth and future generations Building of industrial and information infrastructures, and technology development to use energy efficiently in preparation for the future 6/28

7 Considerations on eco-efficient water infrastructure Prevention of dry stream and urban flood 1. Issues on water management Supply of additional water Control of non-point source pollutants water Management (Rain/Storm/ Greywater) Reduction of energy consumption Alleviation in heat island Restoration of hydrological cycle 7/28

8 Needs of combined utilization 1. Issues on water management Lack of user s recognition Need of advanced treatment tech. Greywater & Wastewater Reuse Sustainability of annual flow rate Emergence as the 3rd Water Industry Rainwater & Stormwater Harvesting Secure alternative water resource Solve environmental problem such as urban flood and non-point pollution source Multifunctional use Economical treatment tech. Continuous annual productivity Irregular rainfall pattern 8/28

9 2. Project description - The Integrated Rainwater, Stormwater and Wastewater Management Project in Cebu, Philippines- 9/28

10 Introduction 2.1 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

11 Outline of the project 2.1 Background Site: DOST 7 Office Building, Cebu City, Philippines Project cost: US$45,000 from ESCAP Construction cost of the tanks supported by DOST 7 MF system donated by EREDE co. Ltd. Project duration: (12 months) Information Source: China South Korea Japan Taiwan Vietnam Philippines Cebu 11/28

12 Process for the system construction 2.1 Background Design RainCity TM and Excel spread sheet Decision Support System Integrated rainwater, stormwater, wastewater Management Techs Green filter For rainwater Storage tank & stormwater Micro-membrane filter system MBR For wastewater Operate Ubiquitous Remote Management System 12/28

13 2.2 System configuration Rainwater & stormwater harvesting system Design of the system Rainfall data and simulation result 13/28

14 Outline of the system 2.2 System configuration Catchment area : 1,500 m 2 MBR system Rainwater tank : 60 m 3 Stormwater tank : 60 m 3 Treated water tank : 40 m 3 Supply tank on a roof : 9 m 3 First flush treatment device: W1,000 L1,500 H1,000 (Total 2set) MF system : 1 m 3 /hr (10 hr operation/day) Wastewater treatment(mbr) : 10 m 3 /day (toilet flushing) 14/28

15 2.2 System configuration Pipe & Instrument Design(P&ID) of the system Treatment tank Rainwater tank Stormwater tank MBR 15/28

16 Rainwater & stormwater harvesting system 2.2 System configuration Green filter Concentration(mg/L) 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 Treatment facility and method for runoff from building rooftop Heavy Matals Fe Cu Zn Time(min) 16/28

17 Rainwater & stormwater harvesting system Storage tank 60 m3 for rainwater, 60 m3 for stormwater 2.2 System configuration 17/28

18 Rainwater & stormwater harvesting system Micro-membrane Filter (MF) system 2.2 System configuration 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 m2 /module Pore size: 0.2 μm 18/28

19 Wastewater reuse system 2.2 System configuration Membrane Biological Reactor (MBR) to treat wastewater Reuse for toilet flushing and gardening Released to the river for eco-system. 19/28

20 2.3 Operation & Monitoring Remote control and operating system 20/28

21 Operation result 2.3 Operation & Monitoring Water quality Date15 April 2011 Samples ph 1 TDS 2 EC 3 BOD 4 Treated Rain /Storm Water Treated Wastewater 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) 21/28

22 Operation result 2.3 Operation & Monitoring Monthly tap water consumption m3 Month 22/28

23 Policy and Social aspects 2.4 Promotion MOU, awards, training and guidebook MOU between DOST and KICT Training-Workshop : Focus on Integrated Rainwater & Stormwater Management Awards from UNESCAP, Philippines, Vietnam Guidebook 23/28

24 Policy and Social aspects 2.4 Promotion Mass media 24/28

25 3. Future Perspectives 25/28

26 International cooperation & support 3. Future perspectives Maldives Cooperation related to rainwater management the Philippines T&R Award of Recognition Vietnam Monre Support technology of rainwater harvesting system Future: Indonesia Mongolia the Kingdom of Bhutan 26/28

27 Summary and vision 3. Future perspectives Adaptation of Climate Change Mitigation of the impact of urbanization Eco-efficient water infrastructure Urban Flood Control Urban Heat Control Additional Water Supply Integrated rainwater, stormwater & greywater Management 27/28

28 Thank you

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