Project Summary
Coffey undertook the upgrade of the Castlemoyle Water Treatment Plant (WTP), increasing its treated water output capacity from 170m³/hr to a minimum of 349.3m³/hr. The works included the provision of a second treatment stream, upgrading of existing facilities, and ancillary works at raw water intakes and storage reservoirs.
Project Description
The existing treatment process at Castlemoyle – comprising coagulation, flocculation, dissolved air flotation (DAFF), rapid gravity filtration, disinfection, and fluoridation – was retained and enhanced by the addition of a second treatment stream. This was achieved by constructing new processes within the footprint of existing Flo-filter units and flocculation chambers, avoiding the need for planning approvals.
The project included works at the Aughananagh and Pollmounty River intakes, Dranagh Raw Water Storage Reservoir, and Ballyleigh Raw Water Balancing Tank. Sedimentation of raw water was designed to occur at the Dranagh inlet reservoir. Coffey provided full design, construction, mechanical and electrical installation, testing, and commissioning services.
Scope of Works
The works included:
- Design and construction of a second treatment stream within the existing WTP footprint.
- Ancillary works at Aughananagh and Pollmounty River intakes.
- Upgrade of Dranagh Raw Water Storage Reservoir and Ballyleigh Raw Water Balancing Tank.
- Installation and commissioning of a specialist monolithic concrete rapid gravity filter floor system with over 1,000 nozzles.
- Installation of a silt trap and sections of new and replacement ductile iron pipework.
- Mechanical, electrical, instrumentation, testing, and commissioning.
Technical Highlights
- Installation of an in-situ monolithic concrete rapid gravity filter floor system integrated into the surrounding civil structure.
- Over 1,000 filter nozzles installed to retain filtration media while allowing filtered water to pass for public supply.
- Integration of new processes within existing plant footprint to eliminate planning delays.
Added Value
- Delivered a significant increase in water treatment capacity, supporting long-term water security.
- Smart use of existing infrastructure to minimise planning requirements and accelerate delivery.
Environmental, Safety or Community Measures
- Improved water quality and supply reliability for the local community.
- Use of efficient treatment technologies to safeguard raw water sources from the Aughananagh and Pollmounty rivers.
To learn more about Coffey’s work in water and wastewater management, or to discuss future opportunities, please contact us at 091 844356 or info@coffeygroup.com.
