ISO INTERNATIONAL STANDARD 20419 First edition 2018-10 Treated wastewater reuse for irrigation Guidelines for the adaptation of irrigation systems and practices to treated wastewater Reutilisation des eauxusees traitees en irrigationLignes directrices pour I'adaptation des systemes et pratiques d'irrigation auxeauxuséestraitees Referencenumber IS0 20419:2018(E) ISO @IS02018 IS020419:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS02018-Allrights reserved IS020419:2018(E) Contents Page Foreword V Introduction. .vi 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions. .1 Treated wastewater (TwW) 2２ 3.1 3.2 Filtration.... Twwqualitymonitoringformicro-irrigation 4 4 4.1 General. 4 4.2 TwW quality monitoring devices 4 4.2.1 Flushing counterfor automated filters 4 4.2.2 pH level sensor 4 4.2.3 Clogging capacity meter 4 4.2.4 Chlorinedemand sensor 55 4.3 Tww quality monitoring procedure 5 Tww reservoirs 5 5.1 General. 5 5.2 TwW reservoir safety 5 5.3 TwW reservoir design 5 5.4 Type of TwW stored in the reservoir 5 5.5 QualityofTwW stored inthereservoir 6 5.6 Reservoir processes affecting TwW quality and derived reservoir operation 6 5.7 Reservoir engineering data and design. 6 5.8 Biological treatmentinreservoirs 6 Filtration systems .7 6 6.1 General. 6.2 Filtration battery manifold structure .8 6.3 Filtration technology Filtrationmedia .12 6.4 Flow/filterarea ratio. .12 6.5 Filtration stationslocation inaccordancewith flow direction 12 6.6 Filtration grade 13 6.7 Manual filter cleaning .13 7 Pumping stations .13 7.1 General. 13 7.1.1 Bottom pumping chamber 13 7.1.2 Floating suction head 13 7.2 Reservoir stratification prevention 14 Adaptation of emitters to TwW .15 8 8.1 .15 General. 8.2 Emitters classification 15 8.3 Drippers .15 8.3.1 General. 15 8.3.2 On-surfacedripperand sub-surfacedripper .15 8.4 Durability and longevity of dripper 15 8.5 Functional features of the dripper 15 .15 8.5.1 General. 8.5.2 Functional features. 16 .20 8.6 Sprinkler/centrepivot/frontal pivot 8.6.1 20 General. 8.6.2 Overhead sprinkler. 20 8.6.3 Mini sprinklers. 21 @ IS0 2018 - All rights reserved iii