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
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. The works comprised the design, specification, procurement, supply, construction, testing and commissioning of the complete, fully functioning wastewater and sludge treatment plant and recycle/reuse system, sewers, connecting pipework and final effluent outfall. The Works included all civil, mechanical, electrical and control works.
Works included the construction of 5 pumping stations. The sewer network included 25 individual pipeline runs with a total length of 7,860m. Pipes ranged from 90mm to 900mm in diameter and included pipes manufactured from ductile iron, precast concrete, HDPE and uPVC. The main sewer from the town of Oldcastle to the treatment plant involved a 1240m length of 450mm diameter concrete pipe.
Project Delivery
The wastewater treatment plant works included all civil engineering and MEICA works relating to:
- Inlet pumping station
- Inlet Works
- 1 No. Storm Holding Tank (236m3 capacity)
- 1 No. Anoxic Tank
- 2 No. Rectangular Aeration Tanks
- 2 No. Secondary Clarifiers
- 1 No. Picket Fence Thickener
- 1 No. Rapid Sand Filter
- Outlet Flow Measurement Flowmeter & Pipework
- Sludge Press & Plant Building
- Administration Building
- Tertiary Pumping Station
- WAS/RAS Pumping Station
- Site works, roads, landscaping and fencing
- Provision of mains services
The existing plant was decommissioned and included an oxidation ditch, sludge storage tank, sludge lifting wheel, sludge tanker draw-off point, phosphorus removal system, two clarifiers, WAS/RAS pumping station, control building and all associated M&E equipment. The existing stormwater holding tank was carefully cleaned, disinfected, dismantled and transported to another facility operated by the client (Ferganstown WWTW, Navan) for reuse.
A new access road was constructed from the adjacent Regional Road (R154) to the wastewater treatment works. This road is 5.0m wide and approximately 720m long and is constructed within an overall land take of 8m width, running through agricultural lands.
The upgrade of the existing pumping station included the construction of a new 175m3 emergency holding tank, pump by-pass suction chamber, pipework arrangement for by-pass delivery pipework, pump wash down facilities, standby generator, all pipework connections and controls and decommissioning of the existing wet well following completion of the pumping station works.
The following sewers and rising mains were laid by an open cut to upgrade to the existing sewerage collection system:
Foul / Combined Sewers:
- 220m approx. of 225mm Dia.
- 500m approx. of 300mm Dia.
- 1,175m approx. of 375mm Dia.
- 870m approx. of 450mm Dia.
- 140m approx. of 600mm Dia.
Storm Water:
- 375m approx. of 375mm dia on Main Street.
Rising Mains:
- 530m approx. of 160mm dia HPPE rising main from Cavan Street pumping station.
