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Bicarbonate-form anion exchange: Inorganic and Organic Fouling
A) Changing water supply and quality
B) Advanced treatment processes needed to meet new requirements from changes in A and demands from D
C) Waste generated in chloride-form anion exchange needs treatment
D) Increasing water demands impact demands in B and generates waste to be treated
E) Effluent contains trace contaminants from C (including high TDS) and D that remain post treatment
This research project was funded by an NSF
funded I3 project at UF awarded to CAR, an
NSF/Australian Academy of Sciences EAPSI
fellowship awarded to CAR, an Occidential
Chemical Research grant awarded to THB,
and faculty start-up funds granted to THB.
We would like to thank Orica Watercare for
providing MIEX resin. Christopher A. Rokicki
(Ph.D., 2013)
Dr. Treavor H. Boyer
Overview and Objectives
The use of previously underutilized water sources for potable water supplies has brought about many new challenges for water
treatment engineers. Magnetic ion exchange (MIEX) is a technology that allows for the targeting removal of natural organic
matter (NOM) from water sources. Currently anion exchange resins such as MIEX are used predominantly in the chloride-form.
The use of a chloride-form resin leads to increased chloride concentration in treated water and thus a potential increase in
corosivity. Additionally, chloride-form resins generate a saline brine solution that is difficult to dispose. Bicarbonate-form resins
may not have these issues, but there is limited literature exploring the use of bicarbonate-form anion exchange. The objective of
this research is to determine how the fouling of bicarbonate-form MIEX differs from the fouling of chloride-form MIEX.
Specific objectives of this research is to: 1) determine which mechanisms contribute to inorganic fouling; 2) quantify the extent
to which inorganic fouling occurs in bicarbonate-form resins; 3) determine the extent to which biological-fouling occurs on
bicarbonate-form anion exchange; 4) determine which microbial interactions impact bicarbonate-form anion exchange
performance.
Preliminary Conclusions
Presence of Magnesium and Calcium increases the extent of fouling of anion exchange resins.
Fouling of bicarbonate-form resins occurs most rapidly in the presence of magnesium
The presence of healthy microbial populations will form biofilms in a bicarbonate-form anion exchange column.
Rokicki, C.A., Boyer, T.H., 2011. Bicarbonate-form anion exchange: Affinity, regeneration, and stoichiometry. Water Research
45 (3), 1329 -1337. DOI: 10.1016/j.watres.2010.10.018
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Treavor H. Boyer, Ph.D. ~ Assistant Professor ~ Department of Environmental Engineering Sciences ~ University of Florida
[email protected] ~ 352.846.3351 ~ www.ees.ufl.edu/homepp/boyer ~ www.twitter.com/WaterWeUpTo
