Celtic Anglian Water

Mission

'Celtic Anglian Water provides world class water and waste treatment services to our clients in Ireland and the UK, by reliably delivering cost-effective operations and maintenance contracts. We strive to conserve our water and energy resources in order to reduce our impact on climate change. We manage our wastes sustainably, and recycle our treated products to protect and enhance the natural environments in which we work. We consistently provide wholesome drinking water and accurate customer bills to those communities which we serve.'

Established in 1998, Celtic Anglian Water is the largest private provider of operations & maintenance solutions for water infrastructure in Ireland. Our expert staff operate & maintain the Ringsend Wastewater Treatment Plant for Dublin City Council, which is amongst the largest and most advanced wastewater treatment plants in Europe. CAW also operates drinking water & wastewater treatment facilities for other towns and cities around the country, including Sligo & Waterford. CAW is also a leading provider of water metering, billing, revenue collection & call centre services for our clients. 

We competitively tender for further O&M and DBO contracts under the government’s National Development Plan, for the delivery of new and upgraded water and wastewater infrastructure, providing local authorities with cost effective services, enhancing the environments in which we work, and protecting the public health in the communities we serve.

The raw water source for the scheme is extracted from Lough Gill, 3 kilometres southeast of Sligo and pumped via a 500mm pipe line at a rate of approximately 550 cubic metres per hour to the main treatment works. The state of the art water treatment plant is delivering around 11 million litres of drinking water a day to the Sligo area. The water is initially dosed with alum and polyelectrolyte to speed up the flocculation process. This dosed water is then conveyed to the flocculation tanks where a paddle type mixer complete with access bridge and handrailing is provided in each tank, to again improve flocculation. The coagulated particles are mixed with a water supply partly saturated with air. These bubbles of air attach to the suspended particles and float to the surface where they are removed by a mounted surface skimmer.

The remaining water is allowed to settle and is then polished off by passing through rapid gravity filters. Following filtration the final water is pH corrected, fluoridated (by others) and chlorinated before entering the potable water supply system. A reservoir is provided on site for the storage of potable water supplies.

Washwater generated during a filter backwash gravitates to the washwater holding tank where it is mixed with the particles removed by the surface skimmer. All suspended matter present in the washwater tank is completely mixed and sent to the sludge thickener. The thickened sludge is pumped to the sludge holding tank and then on to the sludge dewatering building. The sludge is dewatered using a decanter centrifuge and the 18% ds cake is removed off site to a licensed landfill site. As part of Sligo County Council’s (SCC) ongoing environmental protection policy the plant has a capability to recycle the supernatant water from the sludge plant thus reducing the amount of raw water drawn from Lough Gill.

The plant is manned by 3 local, CAW trained staff, with an advanced telemetry system remotely controlling the operation 24 hours a day.

The Water Quality is required to meet the requirements of Article 7, Monitoring of Council Directive 98/83/EC. Water quality is measured with integrated instrumentation for pH, chlorine and aluminium. The plant is currently meeting these water standards and has made a considerable improvement on previous water quality.

Wastewater Treatment

Ringsend Waste Water Treatment Works, Dublin City
The Ringsend Waste water Treatment Plant Design, Build Operate Contract was undertaken to provide preliminary primary, secondary and tertiary treatment (disinfection) for a 1.7 million, p.e. Operations began in 2003 following construction which started in 1999. The original treatment works on the site had to be kept Operational throughout construction. The new works is built on an old landfill and required extensive piling to support the new structures. Ringsend is home to the largest double decker SBR design in the world and is also fundamental to Dublin Bay’s blue flag status.