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SLIGO MAIN DRAINAGE WASTEWATER TREATMENT PLANTOfficial opening 25th May 2009 Design Build Operate Contract (DBO) Protecting Our Natural Habitats Sligeach - The Place of the Shells Benefits of Sligo Wastewater Treatment Facility
Programme of Events
Introductions and ForewordsThis state of the art facility will be of enormous benefit to Sligo and its environs and will serve the residential and commercial needs of a wide catchment area, including Cummeen, Carraroe, Ballincar, Teesan/ Lisnalurg and Rosses Point.
This brochure sets out the technical detail of the new plant, and places this project in the wider context of our ongoing commitment to our environment. Councillor Veronica Cawley
Visitors to the site cannot fail to be impressed with the scale and quality of the Plant, a testament to the professionalism of the Project Team. Councillor Jude Devins
In recent years Sligo County Council has also improved the supply of high quality drinking water to consumers in Sligo and its environs, and we hope to complete our current programme next year with the construction of a new treatment system at Kilsellagh. I wish to acknowledge the support of the Minister and his Staff at the Department for their continued support during this project and other elements of our capital programme. I also want to commend the members of the Project Team who have been involved in the design and construction of this facility, they can be proud of their achievement. Hubert Kearns
I feel the general public have a genuine interest in the operation and maintenance of schemes of this nature. From an educational perspective, I welcome the opportunity to invite schools or community groups to visit the plant, as I believe it represents an excellent model of project management and is a credit to the elected members, staff and project team. Tom Kilfeather Overview
The provision of the plant will accommodate demand from tourism, housing, commercial, industrial and recreational developments in the capital City of the North West Region, together with the provision of sludge reception facility for the treatment of all sewage sludge within the county. Quality EnvironmentThe scheme will ensure the protection of a quality environment in Sligo Bay and will clear the way for the integration of sewerage facilities from the surrounding areas of Cummeen, Carraroe, Ballincar, Teesan/ Lisnalurg, Rosses Point, Hazelwood, Ballinode and all areas designated for development in the Sligo & Environs Development Plan. The new plant will provide treatment to the highest standard including full secondary treatment supplemented by phosphorous removal and by disinfection using ultra-violet lamps. Sligo has been designated as a sludge hub centre and will therefore include a sludge acceptance facility and sludge treatment centre for sludges generated in County Sligo. The treatment works will have a capacity to treat wastewater for a combined domestic and commercial population equivalent of 50,000 and it has to be capable of being expanded to 80,000 at a future date. Story of the Scheme
Jennings O’Donovan & Partners were appointed as designers for all works associated with the development of the sewerage infrastructure in Sligo.
Construction on the plant commenced in November 2006. Design Build Operate Contract (DBO)Sligo County Council entered into a contract with Anglian Water International (AWI) Ltd on behalf of Anglian Water, Huntingdon, Cambridgeshire, England for the design, build and operation of this new treatment facility with a construction period of 2 years and an operational phase of 20 years. To support the project development and operation, Anglian Water Group deployed two main sub-contracts; one was to a consortium comprising Coffey Construction Ltd, Galway as the Civil Contractor for the design and construction of all the civil and building works, and Enpure Ltd, Kettleswood Drive, Birmingham, England as Mechanical and Electrical Contractor for the process design and supply of all the mechanical and electrical equipment and commissioning. The second sub-contract was awarded to Celtic Anglian Water Ltd, City West, Dublin, for the operation of the works on behalf of the client for a 20 year period. Regional contextSligo has been designated as a sludge hub centre and will therefore include a sludge acceptance facility and sludge treatment centre for sludge’s generated in County Sligo and it is expected to be able to receive biosolids for treatment from outside the county boundary. Plant Operation
The treatment works will provide treatment to the highest standard including full secondary treatment supplemented by phosphorous removal and by disinfection using ultra-violet light.
Design BasisPopulation Equivalent - 50,000 Dry Weather Flow - 145 1/s Flow for Full Treatment - 434 1/s Maximum Flow for Storm Treatment - 6569 1/s Maximum Flow to Works 4.86 DWF - 703 1/s Biological Oxygen Demand (BOD) - 3000 kg/d Suspended Solids - 3000 kg/d Orthophosphorous - 148 kg/d Treatment Required
Phosphorus - TP (mg/1) 2 mg/1 annual average UV (Ultra Violet) treatment for bacterial reduction is provided to protect Mari culture activities in Sligo Bay area Protecting Our Natural Habitats
Preserving Our EnvironmentQuality of Life in County SligoOne of Sligo Local Authorities’ core objectives is to ensure a better quality of life for its citizens, and to achieve this we work with the local communities to maintain a high quality environment. County Sligo has one of the highest proportions of unpolluted river channel in the country. This high quality environment makes Sligo a more attractive place to live, and can also be a key determinant of economic prosperity in the entire county and region. Water QualityThe introduction of the EU Water Framework Directive has placed a major focus on water quality. Under this directive, draft River Basin Management Plans have been prepared for all River Basin districts. These plans when finalised will govern how all waters, including rivers, lakes, groundwaters, estuaries and coastal waters are managed, so that at least good status is achieved in all water bodies by 2015. The plans are due to be adopted in December 2009. An extensive water quality monitoring programme is being carried out in County Sligo under the Water Framework Directive. This includes monitoring of 33 rivers and 6 lakes. The biological monitoring indicates that in the monitoring period 2004-2006, 85% of the river stations monitored in Sligo are classified as having satisfactory (i.e. Q4-5 or Q5) water quality. A Groundwater Protection Scheme is currently being prepared for County Sligo by the Geological Survey of Ireland. The overall aim of this scheme will be to preserve the quality of groundwater in County Sligo, particularly for drinking water purposes, for the benefit of present and future generations. MonitoringMonitoring of all public water supplies in the county is ongoing in accordance with EC drinking water legislation. Minimum monitoring frequencies for drinking water depend on the size of the supply, i.e. the volume of water distributed per day. Sligo County Council works closely with the Health Service Executive and the Environmental Protection Agency to ensure the quality of water is maintained throughout the county. The Greening of SligoSligo Borough Council's Recreation and Amenity ProgrammeSligo Borough Council is delivering a major programme of investment in the city’s recreational facilities to cater for a growing urban population. A range of new amenity projects is underway which will contribute enormously to the quality of life for our communities, and the greening of Sligo and its environs makes our city a desirable place to work and live. The provision of the new wastewater treatment facility is a prerequisite to the successful delivery of these amenities. The Council’s Parks Department manages a rapidly increasing portfolio of amenity areas and other land:- 8 playing pitches, 6 playgrounds, a range of landscaped inner city areas, 33 acres of partially landscaped open space and 290 acres of undeveloped space incorporating woodland, pathways and agricultural pastureland. The latest amenities to be completed are Seaview Park, Doorly Park and Forthill Park. These include modern natural grass/sand carpet playing pitches, new recreation areas and cycle ways. When the final phases of the parks and amenities developments are completed, Sligo City will boast quality recreational park areas with extensive quality parkland, a network of interconnecting pedestrian pathways and cycle ways and other amenities.
Our Heritage
It is no accident that Sligo’s wetlands, coastal estuaries, rivers and lakes have been the focus of human civilisation for over 7,000 years. Wetland systems continue to be critical to the development and survival of human communities. This simply reflects the key role that water and wetlands have played throughout human life. The reality is that we still depend on our natural ecosystems to sustain us. The completion of the Sligo Main Drainage Scheme, has brought forward a mechanism where modern demands for growth can be met while minimizing the potential effect of that growth on the key natural resources that sustain our environment and communities. Sustainability in ActionThe real environmental benefit that accrues from this project relates to improved water quality in Sligo Harbour and the wider Sligo Bay complex that includes Drumcliff Bay and Ballisodare Bay. These estuaries provide essential ecosystem services which include; sediment and nutrient retention and export, climate change mitigation, water purification, reservoirs for biodiversity, wetland products such as shell fish as well as recreation, tourism and cultural values. All these benefits are reliant on clean water and the contribution of the Sligo Main Drainage Scheme in this regard is significant. This is sustainability in action, and the scheme will improve water quality and the coastal environment of Sligo Bay for the benefit of the habitats and species that live there, and will make a huge contribution towards improving the quality of life of the people of Sligo City and County. Sligeach - The Place of the ShelsThe site of the Sligo’s new wastewater plant has a special significance in terms of local history, as the following extracts from local histories explain; Wood Martin’s ‘History of Sligo’ states ‘the appellation of Sligo is apparently derived from sligeach, signifying Shelly River, from Slig, a shell.’ Wood Martin is of the opinion that large mounds of the shells of these creatures would have been discarded next to the local dwellings, and that these heaps of bright shells, glittering from a distance, were distinctive enough to give a name to the area around the crossing point on the river.
Wood Martin ‘History of Sligo’1882
Benefits of Sligo Wastewater Treatment Facility
Project TeamClient:
Employers Representative:
Main Contractor:
Design and Build:
Operation and Maintenance:
Anglian WaterAnglian Water International Ltd., a wholly owned subsidiary of the AWG Group of companies, was established to deliver wastewater services and high quality drinking water, in compliance with Domestic and EU regulation, and with a total commitment to sustainable development. As part of its international portfolio, Anglian Water International Ltd entered the Irish DBO market in 1998, and in 2004, successfully bid for the Sligo Main Drainage contract, delivering wastewater services to Sligo town and its environs.
Project ScheduleContract Signing - 18th September 2006 Start Date - 30th October 2006 Completion Date - 29th January 2009 Operation and Maintenance Period - January 2009-January 2029
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© Sligo County Council, County Hall, Riverside, Sligo, Co. Sligo. GPS : Irish Grid 169896, 335864 Tel:071 9111111 Fax:071 9141119 Email:info@sligococo.ie |
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