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Specialist Chemical Engineering Solutions
Southern Water has signed a five-year framework agreement with Gee & Company to supply turnkey packaged wastewater dosing systems under the AMP4 programme. The initiative covers the supply of factory-built ferric dosing plant for phosphate removal to at a number of sites across the Southern Water region.
Comments Gee’s Barry Green, “The framework is for large and small pre-packaged dosing units of the type that we have previously supplied to a number of water utilities, including Southern itself, Yorkshire, Anglian, Thames and Dwr Cymru. This stand-alone solution is highly effective at getting such systems on line more quickly.
“Because they are built and tested in the factory, they offer benefits compared with traditionally built plant, notably that weather dependency is taken out of the equation”, he continues. “For example, the removal of nearly all the civil works means that curing of the lining of traditionally built concrete bunds is no longer the problem that it once could be.
“Just as important to an agreement such as this is the consistency of plant design. It means that training, operation and through-life maintenance will all be set and managed to consistent standards, right across Southern Water’s operation”, he explains.
The turnkey phosphate removal container systems will be similar in concept to the Gee systems supplied under a pre-framework agreement to Southern’s wastewater treatment works at Romsey, Hampshire, earlier this year. This particular £8.6m scheme, which includes the installation of new sand filters, will improve the quality of discharge water – bringing it up to the latest IPPC European environmental standards a year ahead of schedule.
The 11.5 tonne Gee dosing unit houses all the necessary chemical storage tanks, bunds, dosing skid and electrical control panels. The Gee-built phosphate storage vessels are twin 24 cubic metre capacity Cellmar GRP storage tanks constructed to BS 4994, Category 1 and supported on their own bunds. The adjoining dosing skid contains three sets of Signal twin S200 pumps giving flow rates of from 11 to 54 litres/hour. They are arranged in a duty/stand by configuration, with auto changeover function.
A separate kiosk containing all the electrical control equipment is attached to the main container. This lockable kiosk is accessed externally which, apart from improving security, creates a physical separation of the electrical controls from any possibility of contact with chemicals or fumes. This dedicated area has its own heating, lighting and ventilation.
Operation of the whole dosing process uses a Chemitrol Plus system with a controller, allowing pre-set control of all six pumps. It offers dosing control through all parameters including phosphate load, works flow or against a daily profile.
The whole pre-packaged and factory-built container was produced at Gee’s Birmingham factory, where it was tested under controlled conditions, prior to site delivery. At Romsey, the only site preparation that was necessary was the laying of a prepared concrete raft and the provision of the necessary dosing ducts and telemetry.
Having supplied and installed hundreds of these containers across the country, Gee is accomplished at transporting and craning these large units into position, often at remote rural water treatment sites. The company employs its own trained banksmen for just this purpose.
Adds Barry Green, “Through this framework agreement with Southern Water, Gee will be providing many such turnkey containerised dosing systems over the next five year period. Delivery will be made via 4 Delivery Limited, the supply chain network for all Southern’s capital works under the AMP4 programme”.
Gee has spearheaded the use of factory-built package plant for chemical dosing.
