Abstract
ABSTRACTSince the introduction of submerged filters for sewage treatment in Europe, process improvements have been rapid. Downflow submerged filters using natural medium have been superseded by upflow filters using synthetic floating medium. Many advantages have been claimed for these systems and Anglian Water have investigated the operation of the Biobed and Filtabed submerged filters for carbonaceous oxidation, nitrification and suspended‐solids removal. The process is based on the use of a bed of floating plastic beads (2–5 mm) through which the sewage flows in an upward direction. The reactor is aerated or non‐aerated according to the required application. Results have shown the process to be capable of producing an effluent containing less than 2 mg/l amm.N and 5 mg/l SS. Backwash water requirements are less than 1%. The Biobead/Filtabead systems are designed to be competitive with regard to area, capital and operating costs.
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