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Propump forms solid base at £140m sewage works upgrade

Propump’s foamed concrete application has been used at the £140 million expansion of Mogden Sewage Treatment Works in Isleworth, West London. The project is due for completion in March 2013, and will increase the site’s treatment capacity by 50%.

Originally built in the early 1930s, the 55 hectare plant is now one of the UK’s largest sewage treatment works serving close to 2 million people. As a result of population increases, ageing structures and a much publicised history of sewage overflowing into the River Thames during heavy rainfall, there was a clear need for a more efficient, robust and versatile sewage system.

Thames Water appointed Black & Veatch as design and build contractor for the £140 million upgrade which is part of Thames Water’s plans to extend the site’s sewage treatment capacity by 50%. This will significantly reduce the amount of storm sewage that overflows into the tidal stretches of the River Thames when the site becomes overloaded during heavy rainfall. The improvements will also help Thames Water meet tighter quality standards for the effluent discharged.

A crucial element in this upgrade of the sewage works’ capabilities is the upgrade of eight final settlement tanks. As the last stage of the treatment process before the water is discharged to the River Thames, it was vital that these settlement tanks could meet the increasing capacity demands. To ensure any extra weight placed on these old structures is kept to an absolute minimum, strong and lightweight 500kg/m³ foamed concrete from Propump Engineering provided the solution when it came to filling and reinforcing the bottom section of the tanks.

Regularly used to fill underground voids, encapsulate pipes and create flat screeds, the easy application of foamed concrete also makes it ideal for the site where space and access is limited. Foamed concrete is pumpable, self-compacting and can mould itself to the shape of any void for a rapid installation.

Following the foamed concrete application, Black & Veatch will complete the upgrade by reshaping the tanks’ floor areas.

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