A major upgrade to the existing Wastewater Treatment Works was required for Northern Ireland Water with the aim to ensure no major further capital expenditure during the next 5 years whilst a new plant is designed and constructed under the IF106 framework. A condition survey report was undertaken by RPS which examined all the major and critical equipment and infrastructure and put recommendations forward on which items should be refurbished or replaced to help ensure the WwTW remained serviceable without interruption, so far as practicable until the new works is constructed.

The upgrade project entailed:

• Installation of 2 new Pedro-Gil Turbo blowers, replacing 4 of the older Robushci Screw blowers, including all M&E works and PLC process controls.

• New GRP Conical roofs were installed on the existing circular SAS and primary tanks

• Complete refurbishment of the inlet works with all screens removed and refurbished, fitting new chains and motor/gearbox assembly and overhauling both compactors.

• Installing two new interstage pumps and repairing the remaining two pumps.

• Replacing the scraper mechanisms and de-sludge pumps of the two Swirl-Flo Hydrodynamics Vortex Separator (HDVS) tanks

• All 8 SBR Mixers refurbished and the 4 SAS pumps replaced

• Complete overhaul of the sludge conveyor system

• Both inlet drainage pumps overhauled

• Removal and replacement of the scroll and bowl assembly of the NOXON centrifuge

• Replaced 13 valve actuators, 4 penstocks on the SBR inlet splitter chamber, 4 Honeywell Odour monitors and 16 analogue hydro-rangers with digital units.

• Refurbishment of the decanter arms and upgrade of the actuators in all four SBR tanks

All works were programmed and carried out without disruption to the live treatment works and maintaining the consent standards of the effluent.