Wastewater Management
Fig. 1. 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 redundant, Q series modular PLC solution.
Taking control: from inlet-to-outlet
In addition to the standard treatment processes, a new water treatment plant includes an automated processing system for removing manganese.
Neben den
Standardaufbereitungs- verfahren verfügt eine neue Wasseraufbereitungsanlage über ein automatisiertes Aufbereitungssystem zur Entfernung von Mangan.
En plus des processus de traitement standard, une nouvelle centrale de traitement de l’eau inclut un système de traitement automatisé pour retirer le manganèse.
T
he Dee Valley Water (DVW) project to build a new water treatment works at its flagship site, Llwyn Onn in North Wales, has
now been completed. The £17m project opened this year and is controlled by a Mitsubishi Electric system redundant, Q series modular PLC solution. The new works provides DVW with
the capacity to produce 47,000m3 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 manganese, 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 automation control system for the entire
works was particularly stringent. In all, four automation providers, including Mitsubishi, submitted proposals that were scrutinised by DVW and the main project contractor, Black &Veatch, before the preferred Mitsubishi solution was chosen. System integrator, Tycon Automation
has an extensive knowledge of the Mitsubishi product range, having used components to complete several large water control projects in the past. The water treatment process
consists of dissolved air flotation (DAF) clarification, granular activated carbon (GAC) filtration followed by rapid gravity filtration (RGF) and a chlorine contact tank before being pumped to a storage tank – from where it is fed into the distribution network. Although this is not the conventional process order, it is an arrangement that has been designed to work in this area, which has
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