Articles & Case Studies

Gee pre-treatment dosing technology at the heart of Fobney upgrade

Posted: Friday 6th February 2009

Under a contract awarded by Veolia Water Solutions and Technology (VWS), Gee & Company has installed the bulk of the dosing equipment for the Actiflo TM clarification process to treat abstracted water as part of Thames Water’s upgrade of Fobney Advanced WTW in Reading.

By virtue of Gee’ single-source capability, the scope of the company’s contract was to fabricate all thermoplastic chemical storage tanks, and – after factory testing – to supply, install and commission three separate dosing systems, including skid-mounted Signal metering pumps, and all suction and discharge pipe-work to the points of application.

Located in a new and dedicated chemical dosing house at Fobney, the system stores and doses sodium hydroxide, ferric chloride and dosing only for polyelectrolyte.

Of these chemicals, the storage of sodium hydroxide is contained within a lagged and heated 17m³ celmar GRP tank. Ferric chloride is also stored within a Celmar/ GRP tank, of 23m³ capacity, both tanks being fitted with side-entry manways. Both are also manufactured in accordance with BS 4994 Cat1. The tanks have a design life of twenty years, which equates to twenty thousand filling and emptying cycles. Gee manufactured, installed, spark-tested and commissioned all the thermoplastic storage tanks.

Within the Fobney dosing house, two types of metering pumps are deployed. Both the caustic and ferric are dosed by Signal S400 stepper motor pumps, with built-in electronic controls. The polyelectrolyte is dosed using Signal S300MD motor-driven diaphragm pumps, fitted with servo control for automatic stroke length adjustment.

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