Formation and control of disinfection by-products from iodinated contrast media attenuation through sequential treatment processes of ozone-low pressure ultraviolet light followed by chlorination.

Autor: Lopez-Prieto IJ; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA. Electronic address: ilopezp@email.arizona.edu., Park M; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA., AzadiAghdam M; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA., Pan H; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA., Jones SL; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA., Snyder SA; University of Arizona, Department of Chemical & Environmental Engineering, 1133 E. James E Rogers Way, Harshbarger 108, Tucson, AZ, 85721-0011, USA; Nanyang Technological University, Nanyang Environment & Water Research Institute, Clean Tech One, 1 Cleantech Loop, #06-08, Singapore, 637141, Singapore. Electronic address: ssnyder@ntu.edu.sg.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2021 Sep; Vol. 278, pp. 130394. Date of Electronic Publication: 2021 Mar 29.
DOI: 10.1016/j.chemosphere.2021.130394
Abstrakt: Different groups of disinfection by-products (DBPs) were studied through the degradation of iopamidol by the sequential oxidation process of ozone-low pressure ultraviolet light (O 3 -LPUV) followed by chlorination. This paper investigates the attenuation of iopamidol under this sequential treatment and the effect of chlorine contact time (30 min versus 3 days) to control the formation potential of DBPs: trihalomethanes (THMs), haloacetonitriles (HANs) and haloacetamides (HAMs). Thirty target DBPs among the 9 iodinated-DBPs (I-DBPs), were monitored throughout the sequential treatment. Results showed that O 3 -LPUV removed up to 99% of iopamidol, while ozone and LPUV alone removed only 90% and 76% respectively. After chlorine addition, O 3 -LPUV yielded 56% lower I-DBPs than LPUV. Increasing chlorine contact time resulted in higher concentrations of all DBP groups (THMs, HANs, and HAMs), with the exception of I-DBPs. One new iodinated-haloacetamide, namely chloroiodoacetamide (CIACM) and one iodoacetonitrile (IACN) were detected. These results suggest the iodine incorporated in iopamidol may be a precursor for iodinated-nitrogenous-DBPs, which are currently not well studied.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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