Thames Water’s Mogden Sewage Treatment Works is the United Kingdom’s third largest, serving 2 million customers in Greater London. In 2010, work began on an upgrade and expansion project to increase Mogden’s treatment capacity and meet the Environment Agency’s new consent standard.
Working with Thames Water’s Capital Delivery and Operations teams, Black & Veatch was employed as design and build partner for engineering, procurement and construction (EPC) of the new works. The challenge was that under moderate rainstorms, Mogden was unable to fully treat incoming flows. This resulted in more frequent than desirable use of storm tanks and potential discharges of partially treated sewage to the River Thames.