Articles & Case Studies


Posted: Tuesday 5th April 2016

LEADING waste water treatment specialist, Greener Waste Technology (GWT), has led a successful scheme to aid flood recovery and provide a green option for cleaning filter bed media for Scottish Water.

The site, based in Dumfries and Galloway, was flooded by a breach in a nearby riverbank, depositing silt and mud on the surface of the filters, blocking the media and stopping the beds from treating efficiently.

GWT's innovative process enabled the company to complete an intensive clean of the media while the filter bed remained online.

The programme involved a flushing routine to rinse accumulated silt through the bed and wash mud out of the filter media, supported by a combination of spreading and dosing of a patented blend of pre-assimilated bacteria species using a BioCube dosing unit.

The method is more effective, quicker and up to 50 per cent less expensive than traditional filter bed cleaning methods which require the removal of media using heavy machinery.

This can often damage supporting walls and drainage tiles, and also requires the filter bed to be offline for a considerable length of time meaning a hired treatment support process will likely be needed to support the site during the cleaning project.

GWT's cleaning process removes the need for excavating the old media and washing and replacing or renewing it. Alluvial solids can become bound up with excess biofilm and flushing of filter beds is often not sufficient to remove them.

The use of pre-selected strains of bacteria alongside the flushing and rinsing ensures that heavy accumulations of organic matter located deep within the filter bed are efficiently removed.

The addition of a BioCube bacteria breeding unit after the clean ensured the site was supported by reducing load at the head of the works to ensure fast recovery times under flood conditions.

Stuart Christian, Technical Manager at GWT, said: "The BioCube bacteria breeding and acclimatisation unit is a useful tool for sites struggling to meet consent but with limited budgets and long lead times for any potential capital work.

"The BioCube dosing supports the populations of naturally occurring bacteria by improving the environment in which indigenous species flourish, in turn improving the function of mechanical parts and improving the capacity of a works ensuring that increased loads can be handled better to safeguard treatment standards."

David Kiltie, a process scientist with Scottish Water, said: "We found this to be an effective and efficient way of carrying out the required cleaning of media, helping us to maintain the effective operation of the waste water treatment works."

Greener Waste Technology saved the utility over 50% in costs on this project and reduced the timescale of the cleaning task using this innovative approach.

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