ISO INTERNATIONAL STANDARD 20468-6 First edition 2021-06 Guidelines for performance evaluation of treatment technologies for water reuse systems - Part 6: Ion exchange and electrodialysis Lignes directrices pour I'eévaluation des performances des techniques detraitementdessystemesdereutilisationdeI'eau Partie 6: Echange d'ions et électrodialyse Referencenumber IS0 20468-6:2021(E) ISO @ ISO 2021 IS020468-6:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved IS020468-6:2021(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms, definitions, and abbreviated terms. 3.1 Terms and definitions ..1 3.2 List of Abbreviated terms 4 Outline ofion exchangeand electrodialysis 4.1 General 5 Principle of Ion exchange[1]-[19] 4.2 6 4.2.1 Systemconfiguration 7 4.2.2 Process. .9 4.3 Principle of Electrodialysis[1]-[19] 10 System configuration ..13 4.3.1 4.3.2 .15 Process. 4.4 Applicationexamples ..16 4.4.1 ..16 Ionexchange 4.4.2 Electrodialysis ..16 4.5 Performanceevaluationfor ion exchange and electrodialysis ..17 Performance evaluation guideline for ion exchange resin[14]-[19] ..17 5 5.1 Performance evaluation .17 5.1.1 Functional requirements .17 5.1.2 Non-functional requirements .17 5.1.3 Timing for evaluating key factors ..18 5.2 Evaluation method. ..19 5.2.1 Ionexchangeresin ..19 5.2.2 Treated water quality .20 5.2.3 Ion exchange resin tower .20 5.2.4 Operation and maintenance .20 Performance evaluation guideline for electrodialysis [11]-[18] 6 .20 6.1 Performanceevaluation 20 6.1.1 Functional requirements 20 6.1.2 Non-functional requirements 21 6.1.3 Timingforevaluatingkeyfactors .22 6.2 Evaluation method[5][2],[8],[9] .23 Ion exchangemembrane .23 6.2.1 6.2.2 Stack performance .23 6.2.3 Operationand maintenance ..24 Annex A (informative) Main process and typical applications of IER and IEM [20] .26 Annex B (informative) Main treatment technologies and target constituents for reusing water...27 AnnexC (informative)StructuralmodelofIER .28 AnnexD (informative) Selectivity and selectivity coefficient of IERs. .29 AnnexE(informative)ComparisonofvariousIERs. ..31 AnnexF (informative)General operation ofanIERprocess .33 Annex G (informative) Flow diagram of IE and ED process [20] ..35 AnnexH (informative)Feedwaterconditions. .37 AnnexI (informative)Measurementmethod ofelectrical resistanceofIEM .38 @ IS0 2021- All rights reserved ii