Valves hold the key to CASS plant
15 Jan 2000
Keystone valves are playing an important rOle in the new £5million Wath sewage treatment works in South Yorkshire, the first in the UK based on the CASS cyclic activated sewage system.
Main contractor Babcock Engineering owns the UK patent for CASS, which is already in use on plants in the USA and the Far East. The system treats activated sludge on a batch by batch basis, rather than the traditional constant throughput. Treating the sewage in four separate stages has proved to be less labour intensive since the process lends itself more easily to automatic controls.
At Wath, flow control is provided by Keystone quarter-turn butterfly valves which give the bubble-tight shut-off and accurate control necessary for the effective operation of the batch processes. In addition, Keystone knifegate valves control the flow of sewage into the four CASS treatment tanks, a critical part of the process.
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