Clugston gets green light for £72m Leeds sludge treatment plant

Black & Veatch and Clugston Construction are set to begin work on a £72m sludge treatment and anaerobic digestion facility at Knostrop works in the centre of Leeds.

Work can now begin after Yorkshire Water secured planning permission for the bio-energy facility from Leeds City Council.

Knostrop waste water treatment works on Knowsthorpe Lane has been treating sewage from domestic properties and industry for 100 years. The new facility will replace the existing sludge and bio-solid incinerator which was constructed in 1993 and enable the more efficient and effective treatment of sewage combined with the additional benefit of renewable power production from the waste water effluent.

Clugston contract for civil engineering services is worth £14.9m. Its subcontracted package includes, ground preparation and stabilisation, involving recycling of existing concrete structures and installation of 300 CFA piles. This will be followed by construction of the foundations for tanks, control buildings and installation of ductile iron pipework and cable ducting.

Yorkshire Water director of asset management Nevil Muncaster said: “This is the single biggest investment of our current investment period (2015-2020) and will not only provide increased treatment capacity for our sludges but will also deliver significant operational cost savings enabling us to keep customer bills as low as possible.”

He added: “Knostrop is designated as a strategic waste site so by increasing the future sludge and bio-solid treatment capacity of the works the project will support also growth in the Leeds sub-regions.”

On completion in 2019, the facility will be capable of processing 131 tonnes of dry sludge a day and will generate enough renewable energy, using heat and power engines, to provide 55% of the site’s energy needs.

In October 2014 a 123-metre high wind turbine was constructed at Knostrop at a cost of £3.5m. This provides an average of 10% of Knostrop’s energy needs.