Project Summary
The civil works were carried out by Coffey Construction Ltd. relating to this project. The scheme principally involves the construction of a new wastewater treatment plant to serve the population of Waterford City including the portion of Kilkenny County contiguous to Waterford City known as the environs of Waterford City. There is also a requirement to construct a sea outfall from the proposed wastewater treatment plant to the estuary of the River Suir.
Project Description
The treatment plant will treat domestic, commercial and industrial wastewater from Waterford City and Environs. The design capacity of the plant is for a population equivalent of 188,000. The Works comprise the design, specification, procurement, supply, construction, commissioning, testing, operation and maintenance of a complete, fully functioning wastewater and sludge treatment and recycle/reuse system including final effluent outfall. The Works include all civil, mechanical, electrical and control Works at the Belview Site.
Civil Works Design and Build – Coffey Construction, & M&E Design and Build – Enpure Ltd. The above companies form the consortium that executed the design and build contract.
The Civil works carried out by Coffey Construction relating to this project are included below. (Civil design relating to the items listed below was carried out for Coffey Construction by Ryan Hanley Consulting Engineers.)
Wastewater Treatment Facilities
Concrete Works:
Stormwater storage tanks: the tanks had a diameter of 32m and the base was constructed of reinforced concrete with a conical base. The wall was Shay Murtagh precast concrete units. Once the walls were in place a reinforced concrete ring beam was poured at the base of the walls. There were 4 number tanks.
Primary settlement tanks. the tanks had a diameter of 34m and the base was constructed of reinforced concrete with a conical base. The walls of the tanks were Shay Murtagh precast concrete units. Once the walls were in place a reinforced concrete ring beam was poured at the base of the walls. There were 2 number tanks
Final settlement tanks. the tanks had a diameter of 36m and the base was constructed of reinforced concrete with a conical base. The walls of the tanks were Shay Murtagh precast concrete units. Once the walls were in place a reinforced concrete ring beam was poured at the base of the walls. There were 2 number tanks.
Reinforced:
A reinforced concrete inlet substructure was constructed which acted as the grit removal and screening. The channel was a complex structure with varying different hights and had a series of baffle walls and weir plates to control the flow into to tanks.
Selector Tank: A reinforced tanks that were 10m x 12m x 6m high was constructed in from of the aeration tank and channel the flows into the 4 separate lanes in the aeration tanks. This was controlled by a series of valves.
Aeration Tank: A reinforced tank that was 45m x 38m x 6m high. There were 4 separate lanes and baffle walls within the tank.
Digestor Tanks: A reinforced circular tank with a diameter of 12m and a height of 14m were constructed. 2 number tanks were built. The tanks were above ground.
Miscellaneous: There were numerous concrete plinths and bases constructed around the site for various elements of the M&E equipment. There were 4/5 tanks in the sludge area constructed using reinforced concrete.
New Buildings
- Administration building.
- Sludge thickening buildings
- All domestic services and alarm equipment.
Pipelines
- Design and construction of a 1200mm diameter Treated Effluent Outfall discharging to the River Suir.
- All underground Process pipework and services.
- Site drainage, run-off and internal building drainage.
Ground Works
- Facilities for the collection of skips and containers, whenever necessary.
- Provision of electricity water and other services to the site and plant.
- Access and site roads.
- Landscaping and planting of the site.
- Security fencing including access gates.
