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On the site of the existing
Keldgate Reservoir in North Humberside, Yorkshire Water has
constructed a major new water treatment facility. After pilot
trials at the site, a new physical membrane filter type was chosen by
Yorkshire Water as the most effective for the treatment of water from
the Hull Aquifer.
Complex Control
Aston Dane were chosen to design
and implement the complex control strategies surrounding the control
of the pumping at the borehole sources, chemical dosing and treated
water storage at the main works. The system is designed to
optimise energy usage across the plant whilst maintaining
uninterrupted supplies to the consumers.
New Control System
Twelve
Rockwell SLC PLCs control and monitor the plant at the works and
boreholes in conjunction with a dual duty implementation of
Intellution's FIX DMACS SCADA system.
Each
borehole site connects to the main site control system via leased line
communications with manual backup facilities being provided to enable
continued operation from local operator interfaces in the event of
failure.
Process Simulation
In order to validate the design
of the control system, with its complex interactions with the borehole
flows, Aston Dane prepared a software plant model of the works.
This has proved invaluable throughout the design phase and has
continued to be used to investigate the effect of various demand
scenarios on the treated water storage, chemical dosing, filtration
and borehole pumping systems. The value of the preparation of
such a model continues to be demonstrated by its use for plant
simulation during major testing phases and is also used as a training
environment for operators at the site.
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