Facts & Figures

Client Irish Water
LicenseeEPS Group
Wastewater type Municipal
LocationCarrigtwohill, Ireland
Start-up 2015
Status Operational
Average capacity 6,750 m3/day │ 41,000 p.e.(54 g BOD)
 The plant is provisioned to be extended to 60,000 p.e.
Peak Flow844 m3/hour
Pre-treatment None
Post-treatment None 

About the Carrigtwohill Nereda® WWTP

Carrigtwohill has been identified in the Cork Development Plan and the Cork Area Strategic Plan as an area of potential high growth and a substantial increase in the capacity of the foul and surface water networks as well as treatment plant, will be required to cater for the increased hydraulic and biological loads. This in combination with more stringent discharge standards necessitates the construction of new wastewater treatment facilities at Carrigtwohill. The construction of the wastewater treatment facilities at Carrigtwohill is being procured under a design/build/operate (DBO) form of contract.            

This contract provides for the design, construction, operation and maintenance of Wastewater Treatment Plant (WWTP) and associated works including pumping stations, intake works, pipelines and ancillary works as described more fully in these Tender Documents. The design capacity of Phase 1 of the new WWTP is 30,000 p.e. with provision for a future extension to 45,000 and 60,000 p.e. in Phases 2 &3. The Main Contractor, EPS, selected to use Nereda reactors as the main process treatment tool at this new plant.


Carrigtwohill had it's start-up in January/February 2016. According to Process Design Engineer Robin Kraan of Royal HaskoningDHV commissioning and start-up went very well. “We are ahead of schedule and treat more wastewater than previously planned. Partly due to a well thought out design in cooperation with Nereda licensee for Ireland, EPS, the lessons learned from previous projects have led to a beautiful robust plant with a well oiled commissioning.


Contact us

Barry Oliver

Director Sales UK, Water Products & Innovation

Birmingham, UK

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