Providing support for treatment works

Few people driving past United Utilities'Wybersley Water treatment Works in Cheshire will even hazard a guess as to the role this stateof- the-art process plays in producing safe drinking water for homes and businesses across the Stockport area.

In addition to providing 24/7 service and support, Denca has carried out a number of projects at the site.

These have included continuous monitoring capability for cryptosporidium contamination, integration of Lamella plant, and SCADA upgrade. Denca has also upgraded systems.

United Utilities, concerned that a single PLC failure would cause total shutdown, asked Denca to undertake a survey with the remit to propose how reliability concerns could be eliminated or improved.

Denca's expertise enabled the combination of the WTW's PLC1 and PLC2 into a pair of hot standby units in order to create a 'dual redundancy system', ensuring that drinking water supply could not be compromised in the event of a single systems failure.