Project Summary
Coffey delivered the construction of a dedicated Wastewater Treatment Plant (WWTP) as part of the wider development of a major manufacturing facility in Athenry. Located near the Clarin River, the plant is designed to treat process effluent using a compact and efficient Moving Bed Biofilm Reactor (MBBR) system, meeting strict environmental discharge standards. The project supports the long-term sustainable operation of the facility.
Project Description
Located at Dexcom in Athenry, the project involved the construction of a complete wastewater treatment facility, including inlet works, balancing and settlement tanks, aeration and sludge holding tanks, and chemical storage and pumping systems. The selected MBBR technology offers operational efficiency, a reduced footprint, and simplified controls—well-suited to the space-constrained site. Mechanical, electrical, and civil works were delivered to integrate the plant into the site infrastructure. Safety and maintainability were prioritised during the design phase, with early engagement from operations teams.
Scope of Works
The works included:
Deep excavations between the inlet chamber and manhole.
Raft foundations for the MCC kiosk.
External drainage, including stormwater discharge routed under the roadway to the Clarin River.
Installation of a ringed ducting system around the facility, supporting current services and future expansion.
Installation of tanks and a 120-tonne crane lift of the elliptical sludge holding tank in two sections.
Secure integration of pipework and cable trays within a Unistrut framework.
Autosampler and regular effluent testing to ensure ongoing compliance.
Technical Highlights
Implementation of an MBBR treatment system offering reduced hydraulic retention time and operational costs.
Above-ground installation of the balance tank to eliminate deep excavation risks.
Automated sampling systems to support environmental compliance.
120-tonne mobile crane used for specialist tank placement.
Early contractor involvement in design to streamline construction and minimise manual handling.
Environmental and Community Measures
The project prioritised local sourcing for materials, suppliers, and labour. This approach reduced transport emissions, supported local employment, and enabled faster procurement and smoother coordination. Compliance was reinforced by continuous effluent sampling and proactive monitoring.
Added Value
Use of in-situ concrete tanks and eliminating the need for a cofferdam saved approximately 8 weeks on the programme and reduced temporary works costs.
Replacing the planned effluent tank with a smaller flume chamber and relocating the balance tank above ground simplified the construction process.
Above-ground installations and reduced excavation depths lowered health and safety risks.
Shared access walkways improved workflow and minimised delays.
Ongoing coordination with the client, main contractor, and subcontractors ensured a smooth delivery and quick resolution of challenges.
To learn more about Coffey’s work in water and waste management, or to discuss future opportunities, please contact us at 091 844356 or info@coffeygroup.com.
