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DIRK Dewatering Process at Anglian Water Anglian Water provide sewerage to a population of 5.3 million people. It maintains 32,500 kms of sewers, with sludge production of 130,000 tds. Water is supplied to 4 million people, with 33,800 kms water main consuming 1,272 million litres per day.
The East Anglian region covers 10% of the land area of England and Wales, 40% of the arable acreage and 60% of vegetable production, making it an ideal region for agricultural recycling. At the end of 1998, Anglian Water was disposing of 88% of its sludge to agriculture (60% raw) 11% to dedicated/sacrificial sites, 8% to sea dispersal (discontinued) and 1% (material which cannot be recycled) to landfill. Having identified that dewatering of sludge would provide multiple benefits, reducing the volume and therefore cost of distribution to remote locations, and enabling further treatment required for agricultural disposal under new legislation, Anglian selected DIRK to provide dewatering equipment and services. Anglian Water considered a range of criteria in selecting units, including capacity to handle peak loads and variable sludge quality, reliability of polymer plants and the availability of integrated powder polymer make up units.
Analysis demonstrated that DIRK's mobile, self contained dewatering options would match Anglian's requirements. The fully covered units provide minimum physical impact on site, and DIRK was able to provide the requisite level of quality equipment, supported by consultancy, monitoring and testing facilities to ensure that the ideal solution was configured for each site. DIRK supported the deployment of six mobile dewatering centres across the Anglian Water region. Centrifuge and belt press systems were supplied to meet the necessary minimal manpower criteria, and each system was tailored to the requirements of its location using a range of equipment and technologies, many exclusive to DIRK.
Building on the good dewatering results achieved by DIRK's contract equipment, Anglian Water took advantage of DIRK's experience in alkaline sludge stabilisation in combination with the dewatering processes operated by DIRK. |
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