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

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

WSNTG Annual Conference September 2006 Introduction 1.Issues in the provision of wastewater services to small rural communities 2.Seven Villages Pilot Project 3.WRc collaborative Project (STEDS pilot project)

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

WSNTG Annual Conference September 2006 Settlement Plans

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

WSNTG Annual Conference September 2006 Issues contd. DesignReceiving waters/ground Underloading Future growth prediction CapitalNetwork Plant OperationSludge Grit/solids Fats Oils and Greases User behaviour/shock loading

WSNTG Annual Conference September 2006  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 7 Villages Pilot - Objectives

WSNTG Annual Conference September villages - DBO

WSNTG Annual Conference September 2006 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  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. Successful Tender

WSNTG Annual Conference September 2006 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

Unit Costs Village Existing Equiv No ConnectionsUnit cost Upperchurch45€25,093 Loughmore48€22,557 Clonmore45€31,739 Terryglass80€20,277 Clonoulty60€25,705 Hollyford65€23,725 Cullen45€22,973 Average€24,176 O/heads€4,715 Total€28,891

WSNTG Annual Conference September 2006 Marginal Costs Existing Future Domestic % Non Domestic % Domestic % Non Domestic % Marginal Cost Upperchurch Loughmore Clonmore Clonoulty Hollyford Cullen Terryglass Average9.3

WSNTG Annual Conference September 2006 Projections

WSNTG Annual Conference September 2006 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? Questions

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

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

WSNTG Annual Conference September 2006 Alternative collection systems  Vacuum  Pressure  Gravity

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

WSNTG Annual Conference September 2006 Outcome  Septic Tank Effluent Drainage System (STEDS)

WSNTG Annual Conference September 2006