Customer

Uisce Éireann (Irish Water)

Location

Galway, Ireland

Completion Date

Ongoing O&M

Project Outline

Mutton Island Wastewater Treatment Plant is located in Galway serving the entire catchment area of Galway city and its environs. The original plant was constructed and commissioned by Murphy in 2003 and had been operated and maintained by Murphy since it entered service.

This design, build and operate (DBO) project saw Irish Water engage Murphy to refurbish the existing plant and deliver an expansion in capacity from a population equivalent 91,600 to 170,000 followed by a 20-year operation and maintenance period.

Mutton Island Wastewater Treatment Plant uses anaerobic digestion to renewable energy from organic waste and this project also entailed the installation of new combined heat and power (CHP) units to harness the biogas produced to power the operation of the plant.

KEY FACTS

  • Mutton Island is located in Galway Bay which is designated as a Special Area of Conservation and is a location of outstanding natural beauty, serving as an amenity to residents of Galway and tourists.
  • Murphy will continue to operate and maintain this plant for Irish Water until 2035.
  • Upgrade delivered without interruption to operational capacity or performance.
  • Mutton Island Wastewater Treatment Works handles up to 170 million litres of wastewater per day during storm conditions.

Customer

Irish Water

Location

Stillorgan, Co. Dublin

Completion date

June 2022

Value

€37.5 Million

Project Outline

Murphy completed the Design, Build and Operate contract of the Stillorgan Reservoir Upgrade Project on behalf of Irish Water, replacing the existing open reservoirs, with a new covered reservoir. More than 200,000 people in Ireland are now benefiting from a safer and more secure water supply following commissioning of the new Stillorgan reservoir in September 2021.

The Stillorgan Reservoir site has a total plan area of approximately 16 hectares and was subdivided into three discrete water storage reservoirs, the Gray, Upper and Lower Reservoirs.  The Lower and Upper reservoirs were constructed first, as part of the Vartry Water Supply Scheme. The Gray Reservoir was built in 1885 following a period of severe water shortage in Dublin City.

The reservoirs originally contained water from the Vartry Supply Scheme alone; however, following construction of the Liffey Supply Scheme at Ballymore Eustace in the 1940s, a 24” main was laid between Saggart Reservoir and Stillorgan Reservoir to link the two supplies. An additional 1000mm diameter trunk main linking the supplies was constructed on a phased basis during the 1990s.

The Stillorgan Reservoir project removed the open storage that was in operation and replace it with a covered reservoir of 160ML storage capacity. This will ensure a long-term, secure and sustainable water supply to the region, meeting current and future regulatory requirements.

KEY FACTS

  • Murphy completed the Design, Build and Operate contract
  • Covered reservoir of 160ML storage capacity
  • More than 200,000 Dubliners are benefiting from a safer and more secure water

Customer

Uisce Éireann

Location

Dublin

Completion Date

2022

Project Outline

The Ringsend WwTP Phosphorous Fixation & Recovery Project is the first of its kind in Ireland and is currently the largest in Europe by reactor volume. It involves the use of innovative technology to sustainably remove phosphorous from the wastewater being treated at Ringsend WwTP.

The Phosphorous Recovery Facility was constructed within the confines of the existing Ringsend Wastewater Treatment Plant. It now operates in tandem with the Aerobic Granular Sludge technology being installed in the wastewater treatment plant to reduce the levels of phosphorous being discharged into the Lower Liffey Estuary. This safeguards the environment of Dublin Bay, and ensures that the plant operates in compliance with the Urban Wastewater Treatment Directive standards.

The Project was a key part of the overall plant upgrade and involved the installation of a sustainable phosphorous recovery facility using proprietary technology. Auxiliary works were also required to adapt existing wastewater treatment works on site, to supply the required media to the system and recover the phosphorous.

This project has not only enabled the Ringsend Wastewater Treatment Plant to reduce the phosphorus released in the treated effluent, but also allows the phosphorus recovered to be processed to produce sustainable fertiliser for use in agriculture.

The Ringsend Wastewater Treatment Plant, which treats approximately 40% of Ireland’s public wastewater is currently undergoing a substantial upgrade which will deliver, on a phased basis, the capacity to treat the wastewater for a population equivalent of 2.4 million by 2025.

The overall upgrade of the Ringsend Wastewater Treatment Plant will improve the provision of wastewater services and bring the facility in line with the standards of the Urban Wastewater Treatment Directive using the most sustainable methods available.  

KEY FACTS

  • A first of its kind project in Ireland and the largest in Europe by reactor volume
  • Will deliver, on a phased basis, the capacity to treat the wastewater for a population equivalent of 2.4 million by 2025
  • Safeguarding the environment of Dublin Bay, and ensure that the plant operates in compliance with the Urban Wastewater Treatment Directive standards