Filtration system prevents blockage
Published: 11 January 2012 - Heather Ramsden
Problem: Thames Water’s Sewage Treatment Works in Beckton, East London needed a system that would prevent the washwater nozzles from blocking and disrupting the screenings separation process. 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.
Solution: A Bollfilter automatic filtration system has been installed comprising two Boll 6.19 automatic self-cleaning filters and CCD pumps mounted on one skid. The 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.