Comparison of the efficiency of OH radical formation during ozonation and the advanced oxidation processes O3/H2O2 and UV/H2O2

2006 ◽  
Vol 40 (20) ◽  
pp. 3695-3704 ◽  
Author(s):  
Erik J. Rosenfeldt ◽  
Karl G. Linden ◽  
Silvio Canonica ◽  
Urs von Gunten
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Radical Formation ◽  
Oh Radical ◽  
Oxidation Processes

scholarly journals Ultrafine bubbles as an augmenting agent for ozone-based advanced oxidation

2021 ◽  
Author(s):  
Tatek Temesgen ◽  
Mooyoung Han
Keyword(s):  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Negative Influence ◽  
Oh Radicals ◽  
Oh Radical ◽  
Oxidation Processes ◽  
Acidic Conditions ◽  
Ph Conditions ◽  
First Time ◽  
Influence Of Ph

Abstract In this study, the influence of nanobubbles (NBs) application in ozone (O3) based advanced oxidation processes (AOP) is investigated. The results demonstrate the potential of NBs application to O3 – based AOP. It was observed that NBs suppress the negative influence of pH and operating temperatures on the efficiency of ozonation. In addition, the application of NBs tends to improve the solubility of O3 and the rate of mass transfer under the influence of a broad range of temperature and pH conditions. The results of this research indicate that application of NBs minimized the reduction in concentration of dissolved O3 with an increase in temperature. Furthermore, application of NBs highly improved the OH radical formation in acidic conditions. The results of this research depicted for first time that the application of NBs strongly encourages the initiation of reactions involving OH radicals. It was found by this research that NBs can boost the concentration of OH radicals up to 3.5 fold compared to equivalent MB supported ozonation systems. This is assumed to improve the efficiency of currently existing conventional bubble supported O3 – based AOP systems.

Inter-calibration of OH radical sources and water quality parameters

1997 ◽  
Vol 35 (4) ◽  
pp. 1-8 ◽  
Author(s):  
Jürg Hoigné
Keyword(s):  
Water Quality ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Oh Radicals ◽  
Oh Radical ◽  
Natural Systems ◽  
Oxidation Processes

OH radicals are the key oxidants that control most Advanced Oxidation Processes (AOPs) currently applied in water technology and that also occur in some natural systems such as cloud waters. The efficiencies of the various OH radical sources can be experimentally quantified and compared when they are calibrated by following the oxidation of inter-calibrated reference compounds that react during the process only with OH radicals. To apply and generalize the results, however, water quality parameters controlling the lifetime of OH radicals via OH-scavenging reactions by pollutants and further solutes must also be quantified by methods that allow for calibrations.

Advanced oxidation processes: mechanistic aspects

2008 ◽  
Vol 58 (5) ◽  
pp. 1015-1021 ◽  
Author(s):  
C. von Sonntag
Keyword(s):  
Activated Carbon ◽  
Fenton Reaction ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oh Radicals ◽  
Oh Radical ◽  
Reactive Intermediate ◽  
Oxidation Processes ◽  
Water Matrix ◽  
Vacuum Uv

The reactive intermediate in Advanced Oxidation Processes (AOPs) is the •OH radical. It may be generated by various approaches such as the Fenton reaction (Fe2 + /H2O2), photo-Fenton reaction (Fe3 + /H2O2/hν), UV/H2O2, peroxone reaction (O3/H2O2), O3/UV, O3/activated carbon, O3/dissolved organic carbon (DOC) of water matrix, ionizing radiation, vacuum UV, and ultrasound. The underlying reactions and •OH formation efficiencies are discussed. The key reactions of •OH radicals also addressed in this review.

The basics of oxidants in water treatment. Part A: OH radical reactions

2007 ◽  
Vol 55 (12) ◽  
pp. 19-23 ◽  
Author(s):  
C. von Sonntag
Keyword(s):  
Water Treatment ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Radical Reactions ◽  
Oh Radicals ◽  
Oh Radical ◽  
Oxidation Processes

The Advanced Oxidation Processes (AOPs) are based on the reactions of the highly reactive •OH radicals. The formation of •OH by the various AOPs and their ensuing reactions are reviewed.

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