Removal of the precursors of regulated DBPs and TOX from surface waters and wastewater effluents using mixed anion exchange resins
Date
2020-08-20
Authors
Kanan, Amer
Soyluoglu, Meryem
Karanfil, Tanju
Journal Title
Journal ISSN
Volume Title
Publisher
Chemosphere
Abstract
Both organic and inorganic precursors play important roles in the formation and speciation of disinfection
by-products (DBPs). This study aimed to investigate the efficacy of three different anion exchange
resins for removing both organic and inorganic DBP precursors simultaneously in a single treatment
system. Resins in the single (Purolite®-Br, MIEX®-Br, and MIEX®-Gold) and mixed (Purolite®-Br with
MIEX®-Gold and MIEX®-Br with MIEX®-Gold) application modes were tested and compared for the
removal of dissolved organic carbon (DOC), bromide (Br ), and iodide (I ) from a raw source water and a
treated wastewater effluent. Uniform formation condition (UFC) tests were conducted to measure the
concentrations of trihalomethanes (THM4), haloacetic acids (HAA9), haloacetonitriles (HAN6), and total
organic halides (TOX): total organic chlorine (TOCl), total organic bromine (TOBr), and total organic
iodine (TOI) before and after the anion exchange resin treatments. The anion exchange treatment substantially
lowered the DOC, UV254 absorbing matter, dissolved nitrogen (DN), Br , and I . Consequently,
the formation of THM4, HAA9, HAN6, and TOX in the examined chlorinated water samples were reduced
significantly. The maximum reduction in THM4 and TOX (66e69% and 61%, respectively) from wastewater
effluent was achieved by the mixed resin system, which also reduced the THM4 and TOX by 77%
and 77%, respectively, from raw source water. Overall, mixed resin systems (a DOC-selective and a Brselective
resin) resulted in lower amounts of THM4 and HAA9 formation during subsequent chlorination
with lower bromine incorporation as compared to single resin systems. Furthermore, they exhibited
lower TOBr formation, while TOI formation was not detected
Description
Mixed and single anion exchange
resins were tested for the removal of
organic and inorganic DBPs precursors
from water.
Formation of total organic halides
(TOX) was more reduced from
wastewater effluents treated by the
mixed resin system.
Doubling the resin dose resulted in
less than 10e20% improvement in
DBP precursors’ removal.
Keywords
Disinfection by-products , Ion exchange , Bromide , Dissolved organic carbon , Total organic halides
Citation
Kanan A, Soyluoglu M, Karanfil T (2021) Removal of the precursors of regulated DBPs and TOX from surface waters and wastewater effluents using mixed anion exchange resins. Chemosphere 263:1–8. https://doi.org/10.1016/j.chemosphere.2020.128094