Site visit 2015

Crossness Wastewater Treatment Works

The third day will involve a site visit to the Crossness Wastewater Treatment Works. A coach will take you from the University of Surrey and return you there at the end of the day.

Sewer

Photo by Wellcome Library, London

Crossness is Thames Water’s second largest sewage treatment works serving a population of about 2 million. It employs an activated sludge process with primary treatment. The sludge production on site is around 130tDS/day this is treated by combination of the Cambi Thermal Hydrolysis Process (THP) and a Fluidised Bed Incinerator, both will be visited as part of the tour. The THP plant also employs a novel dewatering unit, the Bucher press, which represents a step change in technology for the industry and has opened up an exciting opportunity for post AD energy recovery. More detail will be revealed about Thames Water’s innovative plans for the site and the sludge strategy during the tour. The site’s origins date back over 150years when it was the final discharge of Sir Joseph Bazalegtte’s famous sewer system which helped rid London of the “Great Stink”. The steam powered pumping station still exists today and is operated by ‘The Crossness Engine Trust’ see web link. Lunch will be served in the beautiful Victorian engine house and there will be a chance to see the beam engine in operation. At Crossness, the incoming liquid was raised some 30-40 feet by the application of four large steam driven pumps. The engines were of enormous size and power. They were built by James Watt & Co. to Joseph Bazalgette’s designs and specification, and were named “Victoria”, “Prince Consort”, “Albert Edward” (the Prince of Wales) and “Alexandra” (the Princess of Wales). Lunch will be provided in the Crossness Pumping Station, a magnificent Grade 1 listed Victorian building, in addition, you will have the chance to see the ‘Prince Consort’ in action.

Sewage processing

Photo by David Cane

Sewage processing

Photo by Steve Cadman

crossness.org.uk