Comparison of ferrate and ozone pre-oxidation on disinfection byproduct formation from chlorination and chloramination.

Autor: Jiang Y; Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, United States., Goodwill JE; Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, RI, 02889, United States. Electronic address: goodwill@uri.edu., Tobiason JE; Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, United States., Reckhow DA; Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, United States.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2019 Jun 01; Vol. 156, pp. 110-124. Date of Electronic Publication: 2019 Mar 11.
DOI: 10.1016/j.watres.2019.02.051
Abstrakt: This study investigated the effects of ferrate and ozone pre-oxidation on disinfection byproduct (DBP) formation from subsequent chlorination or chloramination. Two natural waters were treated at bench-scale under various scenarios (chlorine, chloramine, each with ferrate pre-oxidation, and each with pre-ozonation). The formation of brominated and iodinated DBPs in fortified natural waters was assessed. Results indicated ferrate and ozone pre-oxidation were comparable at molar equivalent doses for most DBPs. A net decrease in trihalomethanes (including iodinated forms), haloacetic acids (HAAs), dihaloacetonitrile, total organic chlorine, and total organic iodine was found with both pre-oxidants as compared to chlorination only. An increase in chloropicrin and minor changes in total organic bromine yield were caused by both pre-oxidants compared to chlorination only. However, ozone led to higher haloketone and chloropicrin formation potentials than ferrate. The relative performance of ferrate versus ozone for DBP precursor removal was affected by water quality (e.g., nature of organic matter and bromide concentration) and oxidant dose, and varied by DBP species. Ferrate and ozone pre-oxidation also decreased DBP formation from chloramination under most conditions. However, some increases in THM and dihaloacetonitrile formation potentials were observed at elevated bromide levels.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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