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Zero valent iron produces dichloroacetamide from chloramphenicol antibiotics in the absence of chlorine and chloramines

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Title: Zero valent iron produces dichloroacetamide from chloramphenicol antibiotics in the absence of chlorine and chloramines
Author(s): Chu, W
Ding, S
Bond, T
Gao, N
Yin, D
Xu, B
Cao, Z
Item Type: Journal Article
Abstract: Dichloroacetamide (DCAcAm) is an important type of nitrogenous disinfection byproduct. This study is the first to report that DCAcAm can be formed in the absence of chlorinated disinfectants (chlorine and chloramines). This can occur through reduction of three chloramphenicol (CAP) antibiotics by zero valent iron (ZVI). The effects of key experimental parameters, including reaction time, ZVI dose, pH, temperature, water type, and the presence of humic acid (HA) on the formation of DCAcAm were ascertained. The DCAcAm yields from three CAPs all presented the trend of increasing first and then decreasing with time and also increased with increasing ZVI dosage. DCAcAm yields from the ZVI reduction route were higher than those resulting from the chlorination of some previously identified DCAcAm precursors. Acidic conditions favored the formation of DCAcAm by the ZVI route. In addition, lower temperatures increased DCAcAm yields at extended contact times (>12 h). DCAcAm formed from the three CAPs in the presence of HA was lower than in the absence of HA. The formation potential of DCAcAm from the reduction of authentic waters spiked with CAPs by ZVI showed good linear correlations with initial concentrations of the three CAPs. This allows the formation of DCAcAm from the reduction of CAPs by ZVI to be predicted. Given that many wastewater and drinking water distribution networks contain unlined cast iron pipes, reactions between CAPs and ZVI may contribute to the formation of DCAcAm in such systems.
Publication Date: 12-Aug-2016
Date of Acceptance: 10-Aug-2016
URI: http://hdl.handle.net/10044/1/39729
DOI: http://dx.doi.org/10.1016/j.watres.2016.08.021
ISSN: 1879-2448
Publisher: Elsevier
Start Page: 254
End Page: 261
Journal / Book Title: Water Research
Volume: 104
Copyright Statement: © 2016 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Chloramphenicol
Dechlorination
Dichloroacetamide
Disinfection by-products
Humic acid
Zero valent iron
Environmental Engineering
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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