Project Summary
This project involved the design and construction of a new wastewater treatment plant and associated sewerage network to serve the town of Oldcastle and surrounding area for a Population Equivalent of 3,500.
Project Description
The works comprised the design, specification, procurement, supply, construction, testing and commissioning of a fully functioning wastewater and sludge treatment plant with recycle/reuse system, sewers, connecting pipework and final effluent outfall. The scope also included all civil, mechanical, electrical and control works.
Five pumping stations were constructed as part of the scheme. The sewer network included 25 pipeline runs with a total length of 7,860m, ranging from 90mm to 900mm in diameter. Pipe materials included ductile iron, precast concrete, HDPE and uPVC. The main sewer from Oldcastle to the new treatment plant involved a 1,240m length of 450mm diameter concrete pipe.
Scope of Works
The works included:
- Design and construction of a new wastewater treatment plant, including storm holding, anoxic and aeration tanks, clarifiers, sludge thickening and dewatering systems, and administration facilities.
- Construction of five new pumping stations and associated rising mains.
- Installation of 7.86 km of new sewer network with varying pipe diameters.
- Construction of a new 720 m access road from the R154 to the plant site.
- Decommissioning and reuse of equipment from the old plant, including relocation of a stormwater holding tank to another facility.
Technical Highlights
- Full MEICA design and construction delivered by Coffey.
- 7.86 km of new sewer network with DI pipe diameters ranging from 150 mm to 900 mm.
- Major civil works including 1.24 km of 450 mm diameter concrete sewer connecting Oldcastle to the new treatment plant.
- Integration of advanced sludge treatment: picket fence thickener, sludge press, WAS/RAS pumping station.
- Reuse of the client’s existing stormwater holding tank at another facility through careful dismantling, cleaning and transport.
Added Value
- Careful planning of tie-ins and phased works minimised disruption to the community.
- Reuse of existing assets reduced costs and environmental impact.
- Close collaboration with the client enabled swift agreement of additional works and contract variations.
- Early delivery of critical works improved resilience of the local sewerage network.
Environmental, Safety or Community Measures
- Reuse of a 236 m³ stormwater holding tank at Ferganstown WWTW, reducing waste and extending asset life.
- Construction of new access road designed to minimise disruption to local traffic.
- Pumping station upgrades reduced risk of untreated discharges to the environment.
- Landscaping and fencing works improved visual amenity of the completed site.
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.
