SWELL PROJECT
SWELL -WARRENPOINTWWTW
Warrenpoint WwTW after SWELL upgrade.
Concrete for aeration tank base was poured from 6pm-6am to avoid traffic congestion.
Activated Sludge Plant (ASP) and balance tank.
CONSTRUCTED IN 1976, WARRENPOINT WWTW SERVES THE TOWN AND THE NEIGHBOURING VILLAGES OF ROSTREVOR AND BURREN... WARRENPOINTWASTEWATER TREATMENTWORKS
T he previous Warrenpoint WwTW was designed for a population equivalent of 16,195, with treated effluent being discharged via a 300m long, 450mm diameter outfall pipe directly into Carlingford Lough. Over 40 years on, investigations found that the plant was receiving a load from a population equivalent of 16,259, meaning that it was operating beyond its intended design capacity. The previous operational problems were due to excessive flows being pumped to the inlet works. This problem was exacerbated by network infiltration tidal ingress and inadequate flow balancing at the WwTW. This resulted in un-attenuated flows and premature use of storm tanks in dry weather conditions. This factor was considered to be a significant potential source of wastewater pollution to Carlingford Lough, contributing towards the failure to meet ‘Good’ Water Framework Directive Status status. The improvements delivered under the SWELL project concentrated on addressing overloading at Warrenpoint WwTW and the potential loss of wastewater in order to improve water quality within Carlingford Lough.
CONTRACTORS As main contractor, Geda Construction had overall responsibility to deliver the project on time and within budget, which they succeeded in doing by working in collaboration with key suppliers and sub- contractors to identify and prepare for key milestones for the project. One of the key challenges involved the pouring of 700m3 of concrete for the aeration tank base. “This involved liaison with DFI Roads to close the hard shoulder of the A2 carriageway,” explained Paul McElroy, Contracts Manager for GEDA Construction. “The pour commenced at 6pm and was completed at 6am to avoid traffic congestion around the major link city, Newry.” Atkins provided civil, structural and geotechnical design services. “We were involved from the initial enabling and investigatory works through to optioneering/outline design and detailed design for construction,” said Robin Andrews, Project Manager for Atkins. “Warrenpoint had a complex arrangement of interconnecting pipes and services, and managing the interfaces between existing and new infrastructure was a key element of the design. Atkins adopted BIM Level 2 protocols from the outset and developed
integrated 3D models for existing and proposed works that allowed designers, contractor and client team to collaborate from the optioneering phase through to construction and commissioning.” Water Solutions Ireland (WSI) carried out a full turnkey MEICA and process design and build solution for the SWELL upgrade. Commenting on the completed project, Patrick Cunningham, Contracts Director for WIS said, “To deliver the benefits of improved flow management and remove the potential for loss of biological loading during dry weather conditions, Water Solutions was tasked to review the existing works and develop a full replacement treatment works capable of treating a design of 21,000PE. “The opportunity to put in practice the company motto of “Working to protect the Environment” through a collaborative working relationship with the SWELL team was fantastic.”
PROJECTTEAM...
McAdam Design
Construction Consultancy Services
GEDA Construction
“The previous operational problemswere due to excessive flows beingpumped to the inlet works.”
Water Solutions Ireland
Atkins
www.northernbuilder.co.uk
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