Facts & Figures

ClientIrish Water
Licensee EPS GROUP
Wastewater type Municipal
Start-up 2014
Status Operational 
Average capacity 4,896 m3/day │ 23,000 p.e. (54 g BOD)
Peak Flow622 m3/hour
Pre-treatmentCombined screening, grit and FOG removal  
Post-treatment None 
In the media 2015 Local Authority Engineering Award 

About the Clonakilty Nereda WwTW

Nereda technology comes to Ireland with first treatment plant at Clonakilty

The challenge

Clonakilty WwTW is situated in County Cork, which is the second most populous county in Ireland. The municipal plant serves a population equivalent of 23,000. As part of utility provider Irish Water’s €7 million infrastructure investment, Clonakilty was one of 13 upgraded in County Cork. The scheme arose from the need to protect Clonakilty Harbour, which is classified as a National Heritage Area, Special Area of Conservation and a Special Protection Area. The old plant also experienced some odour issues which needed to be addressed, due to its capacity being overloaded. In addition to matters of conservation, the capacity of the plant needed to be increased, to enable reliable treatment of a greater volume of effluent, to allow the discharged water quality to be enhanced. This would be beneficial both to locals and visitors to the area.

Nereda WWTP Clonakilty, Ireland

Image: Overview of the Clonakilty WWTP

The Solution

The main contractor, EPS Group, was awarded a 20 year design, build and operate (DBO) contract at Clonakilty WwTW. EPS selected Nereda technology for Clonakilty, its first use in Ireland. Clonakilty’s average capacity is now 4896 m³/day, with peak flow capability of 626 m³/day. The upgraded process combines screening, grit and FOG removal. The award-winning Nereda technology uses aerobic granular biomass – this means it requires much less energy and process stages to produce clean water, and it only needs a third of the footprint of other conventional water treatments.

The Outcome

Clonakilty, which became operational in 2015, was the first of more projects in Ireland – inlcuding the wastewater treatment plant of Dublin, Ringsend – to use Nereda technology. The new plants will help utilities provider Irish Water meet its requirements under European Union Urban wastewater treatment directive, which endeavours to improve health, water quality and the integrity of the environment. A key factor at Clonakilty is that the construction of the upgrade is largely underground, to minimise the visual impact of the project on its surroundings. As a result of Nereda’s implementation, Cork County Council won the ‘Local Authority Engineering Initiative Award’ at the Engineers Ireland Excellence Awards 2015, for its innovation and creativity.

Contact us

Barry Oliver

Director Sales UK, Water Products & Innovation

Birmingham, UK

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The local benefits of the project

Nereda logo small Ensure treated effluent complies with EPA standards
Nereda logo small Allow for future growth in population and economic development
Nereda logo small Increase wastewater treatment capacity
Nereda logo small Resolve odour and noise issues

Jim Palmer - Technical Director | EPS
We are delighted to provide Nereda as the next generation wastewater treatment technology to our clients. Nereda is a cutting-edge development which offers very low cost of ownership to end-users of wastewater treatment plants. Jim Palmer - Technical director EPS Group