• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
TABLE 2 Properties of Ion Exchange Resins
Specific Ion Exchanger Reactions - h1015v2_67

Chemistry Volume 2 of 2
Page Navigation
  43    44    45    46    47  48  49    50    51    52    53  
DF Influent  concentration,  conductivity,  or radioactivity Effluent  concentration,  conductivity,  or  radioactivity DF Influent  concentration Effluent  concentration DF 15  ppm  Cl 0.1  ppm  Cl DF 150 DF Influent  radioactivity Effluent  radioactivity DF 2.8  ×  102  µCi/ml 1.0   ×  104   µCi/ml DF 280 WATER TREATMENT PROCESSES DOE-HDBK-1015/2-93 Principles of Water Treatment CH-04 Rev. 0 Page 10 The  ion  exchange  process  is  reversible.    If  too  much  solution  is  passed  through  the  ion exchanger (that is, the capacity of the resin has been exceeded) the exchange may reverse, and undesirable ions or other substances that were previously removed, will be returned to the solution at the effluent.  Therefore, it is necessary to periodically monitor the performance of the ion exchanger and either replace or regenerate the resin when indicated.  Ion exchanger performance is measured by comparing the solution concentration, conductivity, or radioactivity at the influent and effluent.  The parameter measured depends upon the purpose of the ion exchanger.  The term normally applied to ion exchanger effectiveness is decontamination factor (DF),  which  is  defined  as  a  ratio  of  the  concentration  (or  activity)  of  the  fluid  at  the  inlet compared to the concentration (or activity) at the effluent, which expresses the effectiveness of an ion exchange process. Example 1: An ion exchanger influent contains 15 ppm chloride (Cl).  Effluent chloride is measured at 0.1 ppm.  What is the DF of this ion exchanger? Solution: Example 2: Reactor coolant activity entering the purification ion exchanger equals 2.8 x 10    µCi/ml -2 gross activity.  Ion exchanger effluent activity taken at the same time and conditions is measured at 1.0 x 10    µCi/ml.  What is the DF? -4 Solution:







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.