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Pilot‐Scale Evaluation of Bicarbonate‐Form Anion Exchange for DOC Removal in Small Systems
Author(s) -
Ness Alysse,
Boyer Treavor H.
Publication year - 2017
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.5942/jawwa.2017.109.0124
Subject(s) - bicarbonate , sodium bicarbonate , chemistry , brine , chloride , sodium , ion exchange , inorganic chemistry , nuclear chemistry , ion , organic chemistry
This article highlights results from an ion exchange (IX) pilot‐plant study that evaluated bicarbonate‐form anion exchange resin (AER) with sodium bicarbonate (NaHCO 3 ) regeneration for dissolved organic carbon (DOC) removal. Sodium chloride (NaCl) is the conventional regeneration salt; however, NaHCO 3 could be used as an alternative to reduce the environmental impacts associated with NaCl brine disposal. In a comparison of chloride‐form AER and bicarbonate‐form AER, results indicated that chloride‐form AER and bicarbonate‐form AER have a similar affinity for DOC; chloride‐form AER treats more bed volumes before breakthrough than bicarbonate‐form AER; chloride‐form AER is regenerated 10–48% more efficiently with NaCl compared with bicarbonate‐form AER regenerated with NaHCO 3 ; polyacrylic AER is regenerated more efficiently than polystyrene AER using both NaCl and NaHCO 3 ; and the total cost of using NaCl and NaHCO 3 is comparable when brine disposal is considered. Results from this study provide guidance for small water systems considering IX treatment.