Articles & Case Studies

seepex reduces sludge treatment costs at Severn Trent site

Posted: Monday 5th August 2013

seepex engineers, working together with Severn Trent have improved a problematical sludge thickening system at Packington Sewage treatment plant. The partially manned site handles sewage from a population of 28,000, and maintenance costs had been rising due to a series of system failures causing pump problems.

seepex and Severn Trent diagnosed a series of minor issues which, when combined, caused poor reliability of the system, and they suggested some changes based on their experience of pumps and sludge thickening applications.

The sludge discharge chute was enlarged and positioned directly over a larger open hopper pump from the seepex T range, and ultrasonic level controls were linked to pump speed (via a VSD) so the pump output is matched to the thickener discharge rate. These two changes eliminated problems caused by overflowing hoppers and blockages in the thickener discharge to the pump. The open hopper design with integral auger can handle sludges of varying consistency so removing problems with pump performance due to product variation.

Pipework was simplified, with an increased diameter and more direct route allowing inspection and removal of any blockages.

The results – a happy customer at Severn Trent who comments

To date this year we have not incurred any tankering costs as a result of this issue and the unit has not stopped at all since the installation. Our aim is to resolve all of our problems in such a professional manner”

All in all a collaborative approach to problem solving leading to success.

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