Decentralized waste-toenergy project in Naga City Integrated resource management using Nexus approach Regional Workshop on Integrated Resource Management in Asian Cities 3-4 December 2013 Bangkok, Thailand
Outline The setting Project planning (June 2013) Expert rapid field appraisal (Sept 2013) Challenges and opportunities
Context Not centrally located 377 kms south of Manila (national capital), 380 kms north of Cebu (2nd biggest urban center) The core of Metro Naga A fast-growing area comprised of 15 municipalities and Naga City belonging to Metro Naga Development Council (MNDC) A small city 170,000+ population (2010 est.). 48.9% Male; 51.1% Female. Daytime population of around 300-400,000
Potential Nexus projects Top priority Decentralized waste-to-energy project in Del Rosario, Naga City Others Peri-urban farming, energy production linked to MNWD septage plant Applying integrated resource management (Nexus) principles in the 2016-30 Comprehensive Land Use Plan of Naga City
Project background: Nexus-inspired CLUP Executive Order No. 2013-006 issued on Feb 20, 2013 initiated process of formulating successor land use plan for Naga Planning team has been organized Visioning workshop conducted last May 24, 2013 Should be completed by end of 2014
Updating the CLUP Step 1 Getting Organized Step 2 Identifying Stakeholders Step 3 Setting the Vision Step 4 Analyzing the Situation Step 5 Setting the Goals & Objectives Step 6 Establishing the Desired Devt Thrust and Spatial Strategies Step 12 Monitoring, Reviewing & Evaluating the CLUP Step 11 Implementing the CLUP Step 10 Reviewing Adopting & Approving the CLUP and ZO Step 9 Conducting the Public Hearing on the Draft CLUP and ZO Step 8 Drafting the Zoning Ordinance (ZO) Step 7 Preparing the Land Use Plan We are here
Project background: Peri-urban farming + biogas Peri-urban farming linked to sludge treatment plant Being established by the Metro Naga Water District (Naga City + 4 other adjacent towns) Capacity of 56 cum per day Explore possibility of generating energy, fertilizer from sludge
Project goal Promote integrated resource management ( Nexus ) practices in Naga City Implement pilot decentralized waste-toenergy project/s in Naga City
Rationale Primary sanitary facilities used in Naga City are septic tanks or sanitary pits Treatment is achieved by holding waste water in the tank long enough for solids and liquids to separate There is no major wastewater treatment plant, except two small plants serving two newer shopping malls within the city centre Effluent from septic tanks, other polluted water either seeps into the ground or finds its way by the drainage system into the river Construction of treatment plant for extracted sludge from the septic tanks and sanitary pits is ongoing in upper Naga
Rationale 2012 CDIA pre-feasibility study for revitalizing Naga River proposes rehabilitation of septic tanks for around 80% of households and construction of wetlands that will process effluents within and around the city center Project cost is PhP1.4 billion (US$31.4 million) over the next 20 years Communities outside the city center will not benefit from proposed sewerage system, hence need for decentralized solutions
Project site
Project description Establishment of a waste-toenergy facility in the City Government housing project in Del Rosario, Naga City Covers area of 1.5 hectares Sources of waste: Human (around 2,600 persons) 120 households from the housing project 105 inmates from the Naga City District Jail 2,000 students from the proposed Del Rosario National High School Animal: 200 hogs, 50 large cattle from the Naga City Abattoir Housing Project (Phase 1) High School Abattoir District Jail Housing Project (Phase 2) National Highway
Outputs and indicators Human solid waste Animal solid waste EFFLUENT Filtering process 73 cu m/day Separation chamber Slaughterhouse washings Household washings SLUDGE Biogas digester 3.4 tons/day Agitation Treatment Urban garden Compost fertilizer Methane Household cooking
Nexus application Water-Energy-Food integrated resource management Sludge conversion to energy (household cooking, 10% of household expenditures) Sludge conversion to fertilizer (compost) for use in urban agriculture (food account for 14% of household expenditures Effluent treatment for water reuse (urban community garden) Template for future housing project development
Financing Realignment of sanitation component for housing units to the project to partly cover the project (HDMF funding) Cost recovery from piped-in gas service for cooking Revenues from sale of organic fertilizer Revenues from sale of excess gas, if possible
Expert RFA Findings MNWD Septage + Biogas Integration of biogas to MNWS septage facility is feasible Local feedstock: septage, domestic biowaste, pig manure, sugar molasses, rice straw Can generate around P12 million in revenues annually
Expert RFA Findings: Del Rosario Housing Anaerobic treatment plant can be established beside district jail Allows gravity-led transport of wastewater Should expand coverage to include Camella Homes, other real estate Improve housing design based on Nexus project recommendations Tighter project management, in partnership with local state college (BISCAST) Decentralized waste-to-energy project can produce biogas For cooking and warm water in the district jail Heating/cooling in the city slaughterhouse
Vacuum sewer system instead of constructed wetland solution for sewerage Expert RFA Findings: Metropolitan solution
Challenges, Opportunities Fragmented institutional arrangement Water and sewerage rests with an external independent agency Building political support for innovative solutions Will raise cost of basic services, and will be politically sensitive But: Critical to sustainable urban development Two-pronged option Wait it out: install a more receptive MNWD board by 2016 City government to explore Nexus-inspired sanitation service provision Create SPV-type local government owned sewerage company Open to private equity investors, incl Overseas Filipinos Requires hard numbers indicating financial viability