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Medium‐Pressure UV/Chlorine Advanced Oxidation of Taste and Odor Compounds
Author(s) -
Springer James C.,
Kashinkunti Ramesh,
Hong Ying
Publication year - 2018
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/awwa.1090
Subject(s) - odor , chlorine , geosmin , nitrate , chemistry , alkalinity , hydrogen peroxide , ultraviolet , water treatment , environmental chemistry , advanced oxidation process , inorganic chemistry , environmental engineering , organic chemistry , environmental science , materials science , catalysis , optoelectronics
Installations of medium‐pressure ultraviolet (UV) disinfection systems continue to increase, and some systems have excess dose capacity that could potentially be used for a low‐level advanced oxidation process (AOP). While UV/hydrogen peroxide has been commonly used in advanced oxidation applications, UV/chlorine (Cl 2 ) is much less understood and may have limited applications for some of these systems. This work investigates the role of Cl 2 residual, pH, alkalinity, and nitrate on this AOP and the performance that can be achieved at conditions typical to drinking water treatment plants. Results show that a 40–60% reduction of 2‐methylisoborneol and geosmin could be achieved with ambient water quality conditions by adding Cl 2 and significantly increasing the applied UV energy to several hundred mJ/cm 2 MS2 reduction equivalent dose, potentially bringing these compounds below the odor threshold. Experiments with the addition of nitrate demonstrate that it can also serve as a radical generator in waters containing low levels of nitrate.