Severn Trent installs eight UV disinfection systems with new plug and play system

Posted: Friday 10th June 2016

Severn Trent and its project partners have outperformed one of the company's AMP6 targets for 2015/16 by installing eight ultraviolet (UV) disinfection systems at company water treatment works (WTWs).

Severn Trent had set a target for six UV systems to be fitted by the end of March but, working with MWH (UK), NMC-Nomenca, Mott MacDonald Bentley, Lintott Control Systems and Trojan Technologies, and using a factory thinking approach, the team managed to reduce programme duration from 18 weeks to 12 weeks for each site. As the overall project calls for UV systems to be fitted at 28 sites, the improvements have reduced the build time from four years to 30 months.

Marc Lupton, Specialist Teams Manager, said: "These units will help to improve the resilience of our strategic groundwater sites and help to protect the quality of our customers' water for years to come.

"The project has also highlighted our successful 'factory thinking' approach to delivery of our capital programmes by using a standardised factory built assembly, project batching and collaborative planning.

"That meant that, rather than modifying the unit, we could roll them out as a plug and play system where we made modifications to the site if necessary. By doing that, we were able to develop a modular standard UV product that is fully assembled and tested in the factory and then delivered to site."

The treatment units use UV radiation to successfully disinfect bacteria, so reducing the risk of Cryptosporidium or bacteriological failures at our WTWs. The units use special low pressure high output (LPHO) lamps to produce UV radiation, disinfecting the supply without ever coming into contact with the water. All Trojan UV Units being supplied, comply with the very latest UV validated disinfection performance criteria.

"Having a standard product allows us to build confidence with our operational teams as they only have a single product to learn about rather than lots of different systems on each site.

"We're also seeing benefits from using Lintott for the specialist maintenance of the UV systems and emergency call out, so the teams in the WTWs only have to manage the day-to-day operations as they have experts on hand."

The UV systems in AMP6 have so far been fitted at Severn Trent sites at Boughton, Bromsberrow, Buckshaft, Cosford, Neachley, Shugborough, Teanford and Wellings. A further two sites at Blackstone and Chequer House went live at the end of April.

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