Articles & Case Studies

Veolia's Actiflo Turbo is hot stuff at low operating temperatures

Posted: Tuesday 20th September 2016

Veolia Water Technologies has been awarded a contract to supply Actiflo Turbo technology for primary clarification at Northumbrian Water's Horsley water treatment works (WTW). Veolia's Actiflo was selected following on-site pilot trials, between February and May 2012, demonstrated the ability of the process to operate at water temperatures down to 1 degree Celsius whilst still achieving tight clarified water targets for turbidity, colour and residual aluminium.

Horsley WTW will supply 150 million litres of water a day to 800,000 customers on Tyneside. Horsley wtw's raw water supply comes from the River Tyne at Ovingham and the Whittle Dene complex of reservoirs. The Veolia Actiflo plant, part of a works upgrade being carried out by Northumbrian Water's partners, Doosan Interserve Joint Venture, consists of three streams of Actiflo Turbo AC8 units. Apart from its ability to operate at low temperatures, Actiflo Turbo was chosen because it uses Veolia's well proven, ballasted floc, high rate clarification technology in which Actisand is dosed as a seed for floc formation. The resulting rapidly settling flocs means a plant footprint which is 5 to 20 times more compact than conventional clarification systems a major advantage at sites like Horsley where space is restricted. The process also provides the option of dosing powdered activated carbon to remove organic compounds and THM precursors - a seasonal problem at Horsley.

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