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Galliford Try Biwater Mott (End User: Thames Water)
Crossness Sewage Treatment Works (STW) in East London is one of the largest treatment works in the UK, serving approximately two million people. The £145m upgrade project forms part of Thames Water’s London Tideway Improvements programme, which comprises major engineering schemes to improve water quality in the River Thames. This programme includes upgrading London’s five major STW’s, so they can treat more sewage and do it to a higher standard; and creating the Lee Tunnel and proposed Thames Tunnel, designed to prevent pollution entering the Thames from 35 sewer overflow points along the river. Thames Water appointed Tamesis, a joint venture between Laing O’Rourke and Imtech Process, as the major contractor for the Crossness STW upgrade.
The upgrade is designed to meet the improved environmental standards required by the Environment Agency (EA). The improvements will enable the site to treat 44% more sewage than it does currently, significantly reducing the amount of storm sewage that overflows into the River Thames during heavy rainfall when the site’s treatment capacity is exceeded. This scheme will also allow for a 10% population increase in the area being served. The new, additional stream at Crossness will mirror the existing works to provide optimised wastewater treatment. Being one of the largest treatment works in the UK, Crossness STW, along with its sister site, Beckton STW, represent the two largest wastewater improvement projects to be delivered for Thames Water in AMP5.