Articles & Case Studies


Posted: Monday 27th October 2008

The first of six new filter presses for Scottish Water’s Quality and StandardsIII(Q&S3) programme has just been delivered by AshbrookSimon-Hartley, their framework supplier of filter press dewatering equipment.

Currently being installed at Scottish Water’s Invercannie WTW, that serves the city of Aberdeen, this first press is part of its £14.8M drinking water upgrade. A second Manor press is due to follow shortly and by the end of the year a further four are scheduled for delivery to Scottish Water’s Camphill, Daer and Roberton WTWs for their Q&S3 upgrades. All four projects will contribute to providing cleaner, fresher water for Scotland with investment of almost £680M by March 2010.

Ashbrook Simon-Hartley’s managing director Matt Gibson says: “The main challenge on some of these projects will be working alongside the existing equipment so that operations continue uninterrupted during installation. To achieve this each press is being fully constructed in advance at our UK works and performance-tested before being broken down for shipping.”

Filter presses continue to be the preferred option for sludge dewatering at water treatment works Matt adds. “They produce the high solids cake required but with far less energy consumption and lower operational cost than alternative technologies, like centrifuges.” A further factor in their favour, and one he feels will become more significant as water companies strive for sustainable solutions, is that filter presses have a long design life and are relatively easy to refurbish and upgrade cost-effectively.

This appears to have been the thinking behind Scottish Water’s decision to opt for refurbishment of the filter presses at Burncrooks and Loch Turrett where the works are currently being upgraded. “We’ll be able to return them to ‘as new’ condition and performance for a fraction of the cost of replacement,” Matt says. “And refurbishing them one-by-one, on site, will enable the works’ throughput to be maintained throughout the upgrade. For these reasons, asset owners are increasingly finding renewal to be a more attractive option than replacement.”

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