Thames Water adds automatic filtration at UK's largest treatment works
9 Nov 2010
London – Thames Water has installed automatic filtration technology at its sewage treatment works in Beckton, east London as part of a major expansion programme at the works – one of the largest in Europe, serving 3.4 million people.
The sewage treatment process features eight large screens that can operate continually to remove screenings from the sewage. Following primary and secondary treatment, washwater is fed into the screens via a series of nozzles to wash the sludge off and clean the screens and brushes.
To prevent the washwater nozzles from blocking and disrupting the screenings separation process, a Bollfilter automatic filtration system has been installed in the Beckton screen house.
The system which comprises two Boll 6.19 automatic self-cleaning Filte rs and CCD pumps is mounted on one skid for ease of installation. The 6.19 filters, which operate under low pressure conditions, are fitted to the washwater inlet feed prior to the pumps, with the added benefit of protecting these from possible particulate damage.
A small amount of the pressurised washwater is fed back into the filters for efficient cleaning without the need for separate backflush pumps, creating a low energy, space efficient filter/pump solution.
The Beckton filter skid is the second similar installation fitted by Laing O’Rourke for Thames Water. The company installed a similar installation at its Deephams STW, following problems with two previous filter systems.
