Water & Wastewater Treatment

www.wwtonline.co.uk | WWT | june 2014 | 29 Dee Valley Water's £17m flagship water treatment works at Llwyn Onn, North Wales, is controlled from inlet-to-outlet by a Mitsubishi Electric system redun- dant, Q Series modular PLC solution T he Dee Valley Water (DVW) project to build a new water treatment works at its flagship site, Llwyn Onn in North Wales, has been com- pleted. The £17m project was officially opened in March 2014 by the Minister for Natural Resources and Food, Alun Davies, though the site has been opera- tional since August 2013. The new works provides DVW with the capacity to produce 47,000m 3 of drinking water per day for Wrexham and the surrounding area. In addition to the standard treatment processes, Llwyn Onn also includes an automated processing system for removing manga- Pump controls at Llwyn Onn Mitsubishi Electric controls £17m Llwyn Onn water treatment works nese, a mineral that occurs naturally in the surface water of the DVW area. With so many people depending on a continued supply of clean water the process for selecting a reliable auto- mation control system for the entire works was particularly stringent. In all, four automation providers, including Mitsubishi, submitted proposals which were scrutinised by DVW and the main project contractor Black & Veatch, before the preferred Mitsubishi solu- tion was chosen (a Mitsubishi Electric system redundant, Q series modular PLC solution). The majority of the subcontract sup- Project focus ● Dee Valley Water project for a new water treatment works at Llwyn Onn ● £17M project opened in March 2014 Andrew robertson TeChniCaL DireCTOr, TyCOn ● there were elements in the contract specification which meant it suited Mit- subishi hardware. dee Valley Water were flexible in their approach and were looking for a fully redundant system ● dee Valley water could see that tycon had achieved this before with a very reliable fully redundant architecture on a larger system installed on the Isle of Man, which tycon arranged for dee to visit. ● the Mitsubishi QnPrH PLCs are designed to work in a redundant set-up and therefore met the specifica- tion from the outset • Drivers "With so many people depending on a con- tinued supply of clean water the process for selecting a reliable automation control system for the entire works was particularly stringent"

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