Wexford Town WWTP

TJ O’Connor & Associates were engaged by Wexford Borough Council to act as client’s representative in connection with a project to construct a WWTP which caters for a loading of 45,000 p.e. In addition the plant incorporates a centralised sludge treatment facility capable of treating sewage sludge for a loading of 80,000 PE. A 2km long, 900mm diameter inlet sewer and a 2.5km long 1100mm diamter outfall pipeline to the harbour was constructed under the WWTW contract.

The new treatment plant provides adequate reserve capacity to effectively treat the wastewater for the future development of Wexford town and its environs. Construction of Phase 1 for 30,000pe commenced in February 2002 and was completed in June 2003 under a DBO contract. Phase 2 extended the capacity of the plant to 45,000 PE and was completed in 2009 and is now fully commissioned.

Start/End Date:

2002 – 2009

Contract Value:

€24M

Role:

Client’s Representative under the FIDIC Form of Contract with amendments.

Key Features:

• Commissioning of  site investigation works including marine SI works in Wexford Harbour
• Design and preparation of contract documents for both traditional and design/build/operate contracts
• Shortlisting of DBO applicants
• Report on tenders received
• Preparation of Water Services Pricing Policy report
• Preparation of an EIS
• Foreshore licence application including liaison with the Department of Communications Marine and Natural Resources, Wexford Harbour Commissioners and Wexford Shell fishermen as the harbour is a designated shell fishery
• PPP Assessment reports etc
• Preparation of Water Services Pricing Policy Report
• Public consultation and Part VIII Planning Process
• Flow & Load Surveys
• Construction management and supervision

Works undertaken at the new WWTP (45,000 PE) and Sludge Hub Treatment Centre (80,000) PE included:

• Inlet pumping station
• 2km long 900mm dia inlet sewer
• Preliminary treatment including screening with fine screening system (6 mm bar size) combined with grit removal tank
• Storm overflow tank (1 x 2850 m3)
• Activated sludge treatment using 4 No. Sequencing Batch Reactors
• UV disinfection
• Chemical dosing of the wastewater for nutrient removal
• Imported sludge acceptance (cake and liquid sludges)
• Sludge dewatering via centrifuges
• Thermal drying of the sludge via a belt dryer with an evaporative capacity of 1.3 Tonnes per hour
• Construction of a 2.5km long 1100mm diameter final effluent outfall pipe to Wexford Harbour

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