SLUDGE AND SEWAGE TREATMENT
Continental technique used for UK scum
A build up of scum on the anaerobic tank at a BNR plant was proving costly for one water company. Corgin managed to return it to good health
running them. B
One of the biggest challenges facing BNR operators is the formation of surface scum on the anaerobic and/or anoxic tanks. If not removed continuously, this scum can build up and cause process issues which should not be underestimated. These include reduced retention time, high suspended solids in the final effluent, and poor overall plant performance.
Corgin was recently called in to propose a remedy for scum that was building up rapidly on a newly-constructed anaerobic tank at a UK wastewater treatment works. Over the course of a few weeks the scum would build up to a depth of nearly a meter.
With no way of escape from the square tank, a vacuum tanker with two operators had to be called in fortnightly or monthly to suck out this sticky, odorous mess.
Based on successful European installations over 15 years and other
The Foam Skimmer removes surface scum and foam before pumping it away
installations in the UK wastewater industry, odour control specialist Corgin recommended the Foam Skimmer.
This unique equipment removes surface scum and foam, collapsing and thickening it to between 3% and 6% dry solids before pumping it away for disposal. This low-energy, high solids method of removal is a sustainable way of dealing with such problematic scum build-ups. Within days of commissioning the Foam Skimmer, the anaerobic tank was sporting a near scum-free surface. For the first time since the BNR plant was commissioned, operators could see the water surface. nnn
iological nutrient removal (BNR) plants are still relatively scarce in the UK, but are common in other European countries. There is also greater awareness of some of the problems associated with
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Derek Thompson | Product manager | Lhoist UK | Hindlow | Buxton | Derbyshire T: 01298 768 670 M: 07976 391673
derek.thompson@
lhoist.com www.lhoist.co.uk
22 Water & Wastewater Treatment December 2010
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