Kinnegar Wastewater Treatment Works PFI

This contract for Northern Ireland Water was the first of its kind in Northern Ireland and set up under a Private Finance Initiative.


Northern Ireland Water

Contract Value

£10 Million

Contract Duration

1999 - 2024


Project details

The project included the design and construction of a treatment works catering for a population equivalent of 110,000. The site was an existing disposal works at Belfast Lough on the County Down coast.

The works consisted of a new Inlet Treatment structure to screen incoming flows and remove inert material, two 9m diameter SwirlFlo tanks to provide primary treatment and four Sequential Batch Reactors (SBR) each of 7500m3 capacity for secondary treatment. The Final effluent water is discharged into Belfast Lough via an outfall from the site's tidal ponds. Discharges from the ponds occur twice daily high tide.

Storm retention is provided by utilising five existing sedimentation tanks as store tanks. The sludge arising from the process was stored in three new tanks and two converted existing tanks. The sludge is pressed to between 25 – 30 % dry solids. The treated sludge is transported off site for incineration.

Lagan have a 100% share in Coastal Clearwater Ltd the SPV company, Laganwater have a 100% share in Coastal Industrial Ltd formed to service the Operation and Maintenance requirements of the works. The operational period of the contract is 25 years starting from April 1999.

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