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‘Roughing Demineralisation By EDR - A Manufacturers Viewpoint’

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Recent Developments in Ion Exchange

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Synopsis

The Electrodialysis Reversal (EDR) process was introduced commercially in the early 1970’s, with over 500 plants now in operation (from 6 m3/d to 24,000 m3/d). EDR is a symmetrical and reversible membrane demineralisation technique using ion exchange resins in sheet form. It has several advantageous characteristics for functioning well on all types of waters to be found in Europe. Aspects of EDR equipment design are explained. Operational results of representative European pilot plant trials and commercial plants show low power consumption, high water recovery, no chemical dosing and relative freedom from fouling even in severe conditions. Mineral removal is 85–95% depending on analysis and temperature. The economic benefits of the use of EDR as a roughing demineraliser upstream of ion exchange are presented.

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References

  1. ‘Desalting Plants Inventory Report No 8’ by Wangnick Consulting Engineers sponsored by International Desalination Association Feb 1985.

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  2. ‘Electrodialysis Reversal units used as pre-demineraliser in boiler feed water treatment’ by M. Mansouri. 45th IWC Conference Pittsburgh 1984.

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  3. ‘Commercial Production of Ultrapure Water by fully automatic triple membrane (UF/EDR/RO) demineralisers’ by W E Katz & F G Clay 46th IWC Conference Pittsburgh 1985.

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  4. ‘Critical pH as a major parameter in the formation of calcium carbonate’ by H W Venderbosch & L J Overman, KEMA, Arnhem, Holland 1986.

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  5. ‘The determination of supersaturation limits in an EDR unit with aliphatic anion membranes’ by D Elyanow,E Sieveka & J Mahoney. 9th NSWSIA conference Washington DC 1981.

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Author information

Authors and Affiliations

  1. Ionics (U.K.) Ltd, UK

    R. M. Lewis C. Eng, ACGI

Authors
  1. R. M. Lewis C. Eng, ACGI
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Editor information

Editors and Affiliations

  1. Research Division, The North East Wales Institute, Deeside, Clwyd, Wales, UK

    P. A. Williams

  2. Chemistry Deparment, University of Reading, Whiteknights, Reading, UK

    M. J. Hudson

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© 1987 Elsevier Applied Science Publishers Ltd

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Lewis, R.M. (1987). ‘Roughing Demineralisation By EDR - A Manufacturers Viewpoint’. In: Williams, P.A., Hudson, M.J. (eds) Recent Developments in Ion Exchange. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3449-8_33

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  • DOI: https://doi.org/10.1007/978-94-009-3449-8_33

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8044-6

  • Online ISBN: 978-94-009-3449-8

  • eBook Packages: Springer Book Archive

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