Rotork assists Dwr Cymru Welsh Water?s drinking water improvement programme
Dec 21, 2010
Welsh Water is investing £200 million to upgrade its water treatment works across Wales by 2015. This includes the water treatment plant at Cwellyn, where Rotork intelligent electric valve actuators have been installed to control the flow through a new state-of-the-art extension to the works.
Water from Llyn Cwellyn, some two kilometres distant, gravitates to the new treatment plant at a rate of up to 850 m3/hour. The flow initially passes through inlet static mixers where coagulant is dosed to maximise the performance of the DAF (dissolved air flotation) process. The flow is divided into three identical DAF streams, which consist of one Flocculator followed by one DAF cell where particles in suspension are floated to the surface to form a sludge blanket.
The clarified water is then filtered through first stage RGF (rapid gravity filtration) before being pumped to the existing treatment works through Ultra-Violet disinfection to deactivate cryptosporidium.
The Rotork IQT actuators, including some modulating units, control all valve operations including the inlet works flow control, automatic desludging of the DAF cells, automatic backwashing of the RGF plant and the plant treating the effluent created by the clarification and filtration processes.
The successful completion of the upgrade project at Cwellyn will safeguard the drinking water quality for 70,000 Dwr Cymru Welsh Water customers in the Caernarfon area.
Telephone: +44 1225 733200
Fax: +44 1225 333467
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