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.