Chloramination of iopamidol- and bromide-spiked waters containing natural organic matter

Author:

Ackerson Nana Osei B.1,Liberatore Hannah K.2,Richardson Susan D.2,Plewa Michael J.3,Ternes Thomas A.4,Duirk Stephen E.1

Affiliation:

1. Department of Civil Engineering, University of Akron, Akron, OH 44325, USA

2. Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA

3. Department of Crop Sciences and Safe Global Water Institute, University of Illinois at Urbana-Champaign, 1101 West Peabody Drive, Urbana, IL 61801, USA

4. Federal Institute of Hydrology (BfG), Am Mainzer Tor 1, D-56068, Koblenz, Germany

Abstract

Abstract Iopamidol (an iodinated X-ray contrast medium) and bromide are precursors in the formation of halogenated disinfection byproducts (DBPs). The interactions of these precursors are vital to elucidate the formation of halogenated DBPs during chloramination. This work investigated the formation of total organic halogen and select individual DBPs in two laboratory-chloraminated source waters containing iopamidol and bromide. Experiments were carried out in batch reactors containing Barberton source water (BSW) and Cleveland BSW (CSW), spiked with iopamidol (5 μM), bromide (15 μM), and 100 μM monochloramine. Total organic iodine concentrations were approximately equal regardless of source water since they are mostly unreacted iopamidol and iopamidol DBPs. Almost equal amounts of total organic chlorine (3–4 nM) were produced in the source waters, but higher quantities of total organic bromine were formed in BSW than CSW. Substantial quantities of regulated trihalomethanes (THMs) and haloacetic acids (HAAs) were formed in the source waters, along with appreciable concentrations of iodinated trihalomethanes (CHBrClI, CHCl2I, and CHBr2I). Low concentrations of iodo-HAAs were detected, especially at low pH. Overall, bromide concentrations appeared to suppress iodo-DBP formation during chloramination of iopamidol in the presence of natural organic matter. A good correlation (R2 = 0.801) between the yields of regulated DBPs and iodo-DBPs was observed.

Funder

German Research Foundation

National Science Foundation USA

Publisher

IWA Publishing

Subject

Water Science and Technology

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