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Water Services National Training Group

Water Services National Training Group. 10 th Annual Conference 7 th September 2006. Alternative Wastewater Systems A Local Authority Perspective. Matt Shortt Director of Services North Tipperary County Council. Introduction.

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Water Services National Training Group

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  1. Water Services National Training Group 10th Annual Conference 7th September 2006 WSNTG Annual Conference September 2006

  2. Alternative Wastewater Systems A Local Authority Perspective Matt Shortt Director of Services North Tipperary County Council WSNTG Annual Conference September 2006

  3. Introduction • Issues in the provision of wastewater services to small rural communities • Seven Villages Pilot Project • WRc collaborative Project (STEDS pilot project) WSNTG Annual Conference September 2006

  4. Single Rural Dwellings Settlement Plans Multiple Package Plants Maintenance Contracts WSNTG Annual Conference September 2006

  5. Settlement Plans WSNTG Annual Conference September 2006

  6. Issues • Capital Cost/Unit Cost • Annual Operating Cost • Appropriate Treatment • Community support • Future growth WSNTG Annual Conference September 2006

  7. Issues contd. Design Receiving waters/ground Underloading Future growth prediction Capital Network Plant Operation Sludge Grit/solids Fats Oils and Greases User behaviour/shock loading WSNTG Annual Conference September 2006

  8. 7 Villages Pilot - Objectives • Minimise Capex and Opex • Facilitate innovation based on proven technology • Scale • Rural • Proximity • Geographical Spread • Include network • Range of ground conditions topography and discharges points • Other infrastructure/services WSNTG Annual Conference September 2006

  9. 7 villages - DBO WSNTG Annual Conference September 2006

  10. Client Requirements • Construction of new wastewater collection network in 7 villages • Connection of wastewater collection network to individual septic tanks / waste pipes • Construction of 7 new small scale wastewater treatment works and outfall pipelines • Operation and maintenance of wastewater collection networks and treatment plants for a period of 20 years following completion • Compliance with requirements of sludge management plans WSNTG Annual Conference September 2006

  11. Successful Tender • 5 No. Gravity Collection Systems, 2 No. Vacuum Systems • Concrete cast in-situ conventional Activated Sludge Plant for all 7 Villages (Concentric) • Screening and Compaction at all 7 Sites. • Sludge Holding Tank at all Sites. • Stand-by Generator at all 7 WWTW’s. • 2 No. Administration Buildings. • Standard Landscape details. WSNTG Annual Conference September 2006

  12. Contd. • Costs include O+M of sewer network and WWTW • Fixed and variable payments • Variable payments dependent on load • Capital Replacement Fund to ensure value of assets maintained • Rate provided for future connections • Sludge Storage and Transfer included WSNTG Annual Conference September 2006

  13. WSNTG Annual Conference September 2006

  14. WSNTG Annual Conference September 2006

  15. Unit Costs WSNTG Annual Conference September 2006

  16. Marginal Costs WSNTG Annual Conference September 2006

  17. Projections WSNTG Annual Conference September 2006

  18. Questions Is the technology appropriate? By how much will development reduce the unit cost? What is an affordable cost? How will it be funded (Developer + DEHLG + LA)? Will development follow? WSNTG Annual Conference September 2006

  19. “Sustainable Technologies for Small Wastewater Treatment Works” WSNTG Annual Conference September 2006

  20. WRc Collaborative Project (Water Research Centre) Search for and review alternative technologies • Sustainability • Maintenance • Risk of failure • Process performance • Low energy costs • Low operating costs • Renewable energy options WSNTG Annual Conference September 2006

  21. Approach • Literature search • Short list options • Real life applications • Evaluate whole life costs WSNTG Annual Conference September 2006

  22. Alternative collection systems • Vacuum • Pressure • Gravity WSNTG Annual Conference September 2006

  23. Alternative treatment systems • Lagoons or ponds • Biological filtration systems • Mechanical systems • Combinations of each WSNTG Annual Conference September 2006

  24. Outcome • Septic Tank Effluent Drainage System (STEDS) WSNTG Annual Conference September 2006

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  26. WSNTG Annual Conference September 2006

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