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Six Compact C range progressing cavity (PC) pumps from Mono NOV have been installed at a wastewater treatment works in Dukinfield, Manchester.

Four of the pumps have been installed vertically mounted to automatically transfer primary sludge, with a dry solids 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.

Stuart Merson, mechanical project engineer for Gallifordtry-Costain-Atkins JV, the framework contractor for capital schemes in the south of England for United Utilities, said: ‘Mono was able to provide us with a far better technical solution than our existing equipment offered.

‘The Mono pumps deliver excellent performance and could be installed to meet our specific plant requirements,’ he added.

The plant needed to maximise space in the sedimentation tanks, so Mono’s in-house CAD team designed the pumps to be mounted vertically at the side of the tanks.

Special pre-fabricated pipe adaptors were also designed for the pump inlet to allow easy 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.

As a result of the design recommendations at this site, a number of other wastewater treatment works are now using Mono pumps for this type of application.

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.

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 and, because the pumps were available on a short lead time, the customer was able to order the equipment to suit project timings.

The Compact C progressing cavity pump range has been designed to fit into compact spaces while reliably performing to the maximum duty requirement of the application.

The pump uses positive displacement for process control, variable speed for accurate dosing and features a suction lift capability of more than 8m.

This high-pressure pump eliminates the need for a series of pumps when pumping over long distances and the gentle pumping action minimises shear or crush damage.

Low running speeds and an option of a square inlet and conveyor to assist viscous slurries into the pumping element make it suitable for abrasive applications.

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