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50-V1200HistoryAt its Baanhoek site in Dordrecht, Evides Industriewaterproduces demineralised water (demi water) for DuPontfrom surface water.DuPont uses this demi water for the productionof polymers (such as Teflon ® and Delrin ® ) and forgeneration of electricity. In 1997, DuPont initiated a survey into the possibilities forhaving the production of demi water handled by interestedexternal parties. Up until that time, DuPont had beenproviding for its own demi water needs (some 1 million m 3annually) by means of an in-house reverse osmosis plant.This plant converted drinking water into demi water.Since the plant had reached the end of its lifespan DuPontfaced substantial new investments in demi water productioncapacity. Under the company’s policy of “back to corebusiness”, the option of outsourcing the water productionwas an obvious one. DuPont chose Evides to be its partnerfor water.BL IXThe first step was taken with the signing of a customcontract between the companies. Besides the technicalterms and conditions (such as output, output variability,water quality, up-time and supply assurance), agreements ofthis type also include other specific conditions (for example,liability, communication between the parties, permits). Incooperation with Vivendi USF Benelux, Evides subsequentlyconstructed, then began the operation of this demi plant.The plant was finished and commissioned in late 1999, withongoing operation being entrusted to Evides Industriewater.At commissioning, the plant’s capacity was 105 m 3 /hour.In mid-2001, at the request of DuPont, the capacity of theplant was raised. To assure continuity of supply, two buffertanks are on permanent standby (total volume: 1,000 m 3 ).
50-V1100 Demi water plantIn the demi water plant, a number of lines - consisting ofserially operated process units - convert river water from theMeuse river (originating from the giant Brabant Biesboschholding basins) into water of demi water quality.The feedwater conductivity is 350-550 µS/cm.All larger suspended matter (up to 100 µm) in the intakeBiesbosch water is first removed with the help of twostrainers. The water is subsequently dosed with Fe(III),which acts as a coagulant. The water is agitated and thenpassed through an ultrafiltration stage (UF; see table 1) toremove particles, suspended matter and microorganisms.This separation takes place in membrane modulesequipped with capillary membranes (dead-end).The UF unit is equipped with eleven pressure tubes.PFD of the demi water plant
Page 1: Du Pont de Nemours (Nederland) B.V.
Page 5 and 6: 50-V1100 Table 4: Demi water spe

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