120530 Da Nang Municipal Wastewater

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This presentation helped the planning agency to understand the options available for a rational implementation schedule, considering costs and benefits.

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120530 Da Nang Municipal Wastewater

  1. 1. MUNICIPAL WASTEWATERPre-Feasibility Studies in Industrial Waste Water Managementand Drainage SystemsCities Development Initiative for Asia (CDIA)Da NangFinal Report – Presentation for Task Force on Wednesday 30 May 2012
  2. 2. DA NANG CITY –WASTEWATER SYSTEMMunicipal Wastewater – Final Report – Presentation on 30/05/20122SchematicLayoutExistingSituation(Source: Grontmij &Carl Bro 2009)
  3. 3. DA NANG CITY –WASTEWATER SYSTEMMunicipal Wastewater – Final Report – Presentation on 30/05/20123SchematicLayoutPlan(Source: Grontmij &Carl Bro 2009 –recommendedoption)
  4. 4. THE TEN SERVICE ZONES FOR WASTEWATER COLLECTIONWWTP SON TRA WWTP NGU HANH SONMunicipal Wastewater – Final Report – Presentation on 30/05/20124
  5. 5. PRIORITY PROJECTS Optional criteria for priority ranking: Low-income areas with dense population Resettlement areas New development areas Planned development areas Tourism areas Technical and financial rationale Other basis, to be identified Da Nang directions on priority ranking: Priority is for the coastal service zones draining to the easternbeaches. This is a main centre of the tourism economy in Da Nang.Municipal Wastewater – Final Report – Presentation on 30/05/20125
  6. 6. THE TEN SERVICE ZONESMunicipal Wastewater – Final Report – Presentation on 30/05/20126 Idea for sequencing of works
  7. 7. THE TEN SERVICE ZONES - PRIORITY SEQUENCINGMunicipal Wastewater – Final Report – Presentation on 30/05/20127
  8. 8. COST ESTIMATION – BASIC PREMISES Wastewater systems should be planned/designed with thecapacity required in the year 2020. For planning purposes, district population numbers for2020, as specified by DPI, should be used. In 2020, the targeted connection rate for householdsshould be 50%, and for all other wastewater producers100%, as per the Da Nang Wastewater Strategy of 2010. Should use the Da Nang Municipal Infrastructure Map(digital). The study’s calculations should comply with the official technical designcriteria for the sector. Cost estimation should be made according to the guidelines for publicinvestment projects.Municipal Wastewater – Final Report – Presentation on 30/05/20128
  9. 9. DA NANG WASTEWATER MANAGEMENT STRATEGY Wastewater Management Strategy to the year 2020 (8438/QD-UBND,03/11/2010) Sets definite targets to be achieved by 2015 and 2020 Gives orientation for further development until 2030 and 2040 Attached: “Wastewater System Strategy” (July 2010) Three strategy targets important for our study: capacities of WWTPs Son Tra, Ngu Hanh Son, Hoa Xuan percentage of households to be connected to the system development of a separate wastewater system, with priority for new residential areas, tourist areas, and coastal areas Districts Son Tra and Ngu Hanh Son: Coastal area – Beaches a core asset for tourism - New residential areas Focus of study: To separate wastewater system from storm water system To substantially increase number of households connected to systemMunicipal Wastewater – Final Report – Presentation on 30/05/20129
  10. 10. COST ESTIMATE – BASIC SCENARIOMunicipal Wastewater – Final Report – Presentation on 30/05/201210
  11. 11. ALTERNATIVE SCENARIO FOR INITIAL INVESTMENT Basic Scenario – Initial Investment cost 100% Full coverage of the service zone by tertiary & secondary networks 50% connection rate (50% of expected number of wastewater producersin 2020) Scenario A – Initial investment cost down to 58% Selected coverage of the service zone by tertiary & secondary networks,namely just enough for achieving … 50% connection rate (50% of expected number of wastewater producersin 2020) Scenario B – Initial investment cost up to 101% Same as Basic Scenario, but tertiary and secondary networks use ahigher percentage of larger diameter pipes Scenario AB - Initial investment cost down to 59% Same as Scenario A, but tertiary and secondary networks use a higherpercentage of larger diameter pipesMunicipal Wastewater – Final Report – Presentation on 30/05/201211
  12. 12. ALTERNATIVE SCENARIO FOR INITIAL INVESTMENTMunicipal Wastewater – Final Report – Presentation on 30/05/201212
  13. 13. RECOMMENDED SCENARIO & FURTHER REFINEMENT Priority 1&2: Service zones C-ST1 and C-NHS1, C-ST2 and C-NHS2 Rationale: Most important and urgent is to stop pollution of beaches and sea by wastewater spills Therefore, have to connect all wastewater producers to a dedicated wastewater collection system at once Scenario: Adopt B Refinement: connect all wastewater producers at extra cost of about 3% Priority 3&4: Service zones R-ST1 and R-NHS1, R-ST2 and R-NHS2 Rationale: Important is to reduce the pollution of the river by wastewater spills Urgency not very high: connection rate 50% by 2020 is acceptable Should be selective in initial coverage Install extra capacity into tertiary and secondary networks to accommodate increasing connection rate Scenario: Adopt AB Refinement: none Priority 5: Service zones C/R-NHS3 and D-NHS1 Rationale: Residential development still at initial stage and wastewater production is at a low level Only connect areas with high wastewater production level: housing complexes, tourist resorts Install extra capacity into tertiary and secondary networks to accommodate increasing connection rate Scenario: Adopt AB Refinement: Reduce initial investment to 1/3 of cost of ABMunicipal Wastewater – Final Report – Presentation on 30/05/201213
  14. 14. COST ESTIMATE – ALTERNATIVE SCENARIOMunicipal Wastewater – Final Report – Presentation on 30/05/201214
  15. 15. TIME SCHEDULEMunicipal Wastewater – Final Report – Presentation on 30/05/201215
  16. 16. FURTHER STUDY Verify population growth estimates What is the maximum population density? For example, CIPR (2010)mentions densities varying between 1,674 persons/km2 in Lien Chieu to18,380 persons/km2 in Thanh Khe. Consider possible risks/issues and identify solutions Implications of saline environment Unexploded ordinance and toxic materials Need for maintaining access possibilities to premises Recommend mitigation measures for current situation Pump all water to the river? Discharge to the sea, through a long pipe? Consider technical and investment options Formulate priority projectsMunicipal Wastewater – Final Report – Presentation on 30/05/201216
  17. 17. THE ENDThank youMunicipal Wastewater – Final Report – Presentation on 30/05/201217

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