05 May 2009
The vertically mounted pumps handle dry solids in concentration of up to six per cent, in a consistent and controlled flow from the bottom of the primary sedimentation tanks to the secondary treatment process. Mono’s CAD team had to design the pumps for vertical mounting in order to maximise space in the sedimentation tanks. Special pre-fabricated pipe adaptors were also designed for the pump inlet to allow connection to the existing discharge pipework at the base of the tanks. Davit points also eliminate the need for maintenance staff to enter into a confined space to disconnect the pumps for any routine maintenance. The remaining two Compact C pumps were installed to transfer sludge liquor. Once sewage has received sufficient treatment, excess liquor, a combination of sewage and biological mass, is discharged into settling tanks and the treated supernatant is run off to undergo further treatment before discharge. Mono’s pumps were installed to transfer this sludge liquor from the top of the sludge-settling tank, for further storage, before returning it back to the inlet works.Steve Merson is a mechanical project engineer for Gallifordtry-Costain-Atkins JV, the framework contractor for capital schemes in the South for United Utilies. He said: “Liquors are very concentrated and problems can be experienced in periods of low flow. Mono was able to offer variable speed control so that the amount of liquor pumped out was dependant on the flow coming in.”The Mono pumps were installed inside the bunded walled dry well area of the plant’s pump house.
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