ASTM_D_6529_-_11.pdf

Designation:D652911Standard Test Method forOperating Performance of Continuous ElectrodeionizationSystems on Feeds from 501000 S/cm1This standard is issued under the fixed designation D6529;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the oper-ating characteristics of continuous electrodeionization(CEDI)devices using synthetic feed solutions and is not necessarilyapplicable to natural waters.This test method is a procedureapplicable to solutions with a conductivity range from approxi-mately 50 to 1000 S/cm.1.2 This test method covers the determination of operatingcharacteristics under standard test conditions of CEDI deviceswhere the electrically active transfer media therein is predomi-nantly unregenerated.This results in more rapid achievementof steady state and shorter test time than when performing atest which requires the active media be predominantly regen-erated.1.3 This test method is not necessarily indicative of thefollowing:1.3.1 Long-term performance on feed waters containingfoulants or sparingly soluble solutes,or both,1.3.2 Performance on feeds of brackish water,sea water,orother high-salinity feeds,1.3.3 Performance on synthetic industrial feed solutions,pharmaceuticals,or process solutions of foods and beverages,or,1.3.4 Performance on feed waters less than 50 S/cm,particularly performance relating to organic solutes,colloidalor particulate matter,or biological or microbial matter.1.4 This test method,subject to the limitations previouslydescribed,can be applied as either an aid to predict expecteddeionization performance for a given feed water quality,or asa test method to determine whether performance of a givendevice has changed over some period of time.It is ultimately,however,the users responsibility to ensure the validity of thistest method for their specific applications.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility or regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1293 Test Methods for pH of WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD4189 Test Method for Silt Density Index(SDI)of Water3.Terminology3.1 DefinitionsFor definitions of general terms used in thistest method,refer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 cellan independently fed ion-depleting chamberformed by two adjacent ion-exchange membranes,or by amembrane and an adjacent electrode.3.2.2 continuous electrodeionization(CEDI)devicea de-vice that removes ionized and ionizable species from liquidsusing electrically active media and using an electrical potentialto influence ion transport,where the ionic transport propertiesof the active media are a primary sizing parameter.The CEDIdevices typically comprise semipermeable ion-exchange mem-branes and permanently charged ion-exchange media.Ex-amples include continuous deionization,electrodiaresis,andpacked-bed or filled-cell electrodialysis.3.2.3 current effciencythe ratio,expressed in percent,ofthe net transfer of ionized and ionizable solutes per unit cellwithin a CEDI device,expressed in chemical equivalents1This test method is under the jurisdiction of ASTM Committee D19 onWaterand is the direct responsibilities of Subcommittee D19.08 on Membranes andIon Exchange Materials.Current edition approved Oct.15,2011.Published October 2011.Originallyapproved in 2000.Last previous edition approved in 2009 as D652900 which waswithdrawn January 2008 and reinstated in October 2011.This reinstatement datematches the year date after the designation.DOI:10.1520/D6529-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 transferred per unit time,to the number of coulombs trans-ferred from an external dc power source to each electrode pair,expressed in faradays per unit time.Calculation of currentefficiency is described in 9.2.4.Summary of Test Method4.1 This test method is used to determine performancecapabilities of CEDI devices with regard to extent of ionremoval,pressure/flow relationships and electrical power con-sumption at stan