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Wanlip Sludge Works

Wanlip STW is Severn Trent Water’s third largest sewage works. The site is located north of the city of Leicester and serves a population equivalent (PE) of 582,800. By the year 2026 Wanlip STW will treat a dry weather flow (DWF) of 140,000m3/d, a full flow to treatment (FFT) of 345,600m3/d for a PE of approximately 660,000. The old treatment works included a sludge digestion facility treating indigenous sludge, imported sludge and trade waste sludge. The Wanlip Sludge Project is part of the AMP5 investment programme and provides Severn Trent Water and its customers with a new sludge digestion facility with an increased treatment capacity to replace the existing aged and inefficient sludge digestion plant.

The works completed in the main contract were

New build sludge facility including; SAS thickening, primary sludge thickening, sludge import, enabling/common works, pre-digestion blend tanks, APD, GPD, dewatering, CHP, pipelines, roads and paving.


Franklyn Yates Engineering Scope of Work:

Franklyn Yates engineering scope of work included the design, supply, manufacture and installation of over 8000 metres of various ductile iron, stainless steel, scotchcoated carbon steel and plastic pipework systems.  This included the installation of numerous free issued valves, pumps, flowmeters and instruments.

Franklyn Yates had to co-ordinate the design of the pipework systems with information provided via a 3D model and various different package supplier data such as gravity belt thickeners, heat exchangers, tanks and centrifuges.  This proved to be very challenging due to the sheer size and complexity of the whole project.

One of the key factors in ensuring that the project was a success for all the stakeholders was the adaption of the “collaborative planning” approach for which Franklyn Yates was the principal driver as we had the majority of the work to deliver.

Another challenging element of the project was the support arrangements of the above ground pipework.  Much of the pipework was at height where it connected into various sludge digesters, tanks and the SAS building.  It also crossed many access roads throughout the site which meant that several pipe bridges had to be designed and installed.  Interfacing with the clients’ civil design and delivery contractor was again another very difficult challenge.  Having faced the challenges head on the above ground pipework systems and the pipework support matrix was completed within budget and without incidents of accidents.


If you would like to find out more information on the overall works completed on site you will find a useful case study on the link below

Wanlip Sludge Works

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