Investigation of Ozone Reaction in River Waters Causing Instantaneous Ozone Demand

Cho, Min; Kim, Haeshim; Cho, Soon Haeng; Yoon, Jeyong

doi:10.1080/01919510390481577

Cited by 27 publications

(19 citation statements)

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“…Ozone exposure can be directly determined from an ozone decomposition curve with time in a batch-type reactor (Hoigné and Bader 1994). Ozone decomposition in natural waters typically shows bi-phasic kinetic behavior (Buffle et al 2006a;Cho et al 2003;Elovitz and von Gunten 1999;Kaiser 2000a, 2000b;Hoigné and Bader 1994;Park et al 2001;Yong and Lin 2013). Within a few seconds to a minute after ozone is added, it is quickly consumed by its reaction with ozone-reactive water constituents such as dissolved organic matter (DOM) with phenol, amines moieties, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Ozone decomposition after the IOD phase is slower and typically follows apparent firstorder decay kinetics for the ozone concentration. The corresponding first-order decay rate constant in the secondary phase has been termed k sec (Cho et al 2003;Elovitz and von Gunten 1999;Elovitz, von Gunten, and Kaiser 2000a;Hoigné and Bader 1994;Park et al 2001;Yong and Lin 2013). Using the IOD and k sec as the master parameters, the time-dependent ozone concentration ([O 3 ] t ) and the corresponding ozone exposure can be calculated with Equations [2] and [3], respectively:…”

Section: Introductionmentioning

confidence: 99%

“…The R Ct values determined in the secondary ozone decay phase in natural water are usually constant (Acero and Von Gunten 2001;Buffle and Von Gunten 2006;Cho et al 2003;Elovitz and Von Gunten 1999;Elovitz, Von Gunten, and Kaiser 2000a;Park et al 2001). In this case, R Ct is equal to the concentration ratio of the OH radical to ozone (i.e., R Ct = [ • OH] t /[O 3 ] t ), which is useful for kinetic modeling of the ozonation process (Kaiser et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Seasonal Variation of Water Temperature and Dissolved Organic Matter on Ozone and OH Radical Reaction Kinetics During Ozonation of a Lake Water

Shin

Hidayat

Lee

2015

Ozone: Science & Engineering

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This study used key description parameters of the ozonation process in lake water samples over a 1-year period to better understand the influence of seasonal variations in water quality such as water temperature and dissolved organic matter on ozone decomposition and OH radical formation and reaction kinetics. The parameters were the initial ozone demand (IOD), ozone decay rate constant after the IOD (k sec ), ratio of OH radical exposure to the ozone exposure (R Ct ), and ratio of ozone consumption to the OH radial exposure multiplied by the second-order rate constant for the reaction of the OH radical with an OH radical probe compound (Ω). The seasonal variations in water quality had the most significant influence on R Ct (39-64%), followed by k sec (35-38%), Ω (27-34%), and IOD (11-25%) for the raw lake water and sand-filtered water in which the numbers inside parentheses indicate the percent standard deviation of the measured values for 1 year. For the oligotrophic-type lake water, the seasonal variation in water temperature (6-26°C) had the most significant influence on the k sec , R Ct , and Ω. The Ω was newly found to be inversely related with water temperature, possibly due to the temperature-dependent OH radical yield from ozone decomposition. This implies that the OH radical oxidation capacity during ozonation can be significantly influenced by the temperature due to the varying ozone decomposition rate and the intrinsic OH radical yield. This study also demonstrated the Ω is a useful, alternative parameter to the R Ct for describing or predicting OH radical exposure from ozone consumption especially when the ozone decay is rapid or varies over time such as the initial ozonation phase of natural water or wastewater where a considerable OH radical exposure takes place. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Seasonal Variation of Water Temperature and Dissolved Organic Matter on Ozone and OH Radical Reaction Kinetics During Ozonation of a Lake Water

Shin

Hidayat

Lee

2015

Ozone: Science & Engineering

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“…This has been shown to result in very high transient • HO concentrations and thereby plays an essential role in many processes such as bromate formation or pharmaceutical contaminants oxidation (Buffle et al 2004;Park et al 2001). In batch reator experiments, Cho et al (2003) showed that IOD of two Korean river waters (pH fixed at 7, alkalinity < 10 mg/L as CaCO 3 ) was responsible for over 40% of the consumption of ozone applied, which ranged from 0.26 to 0.29 mg/mg of the DOC. They also found that more than 40% of IOD of two commercial humic acids came from the • OH mediated ozone reaction.…”

Section: Discussionmentioning

confidence: 99%

“…IOD is defined as the initial rapid ozone consumption during approximately the first 20 s of ozonation Cho et al 2003;Hoigné and Bader 1994;Park et al 2001). For this work, IOD was calculated as the difference between the applied dosage and the initial ozone concentration predicted by regressing a first-order decay on the ozone vs time data.…”

Section: Dbp-ufc Correlations With Immediate Ozone Demand (Iod)mentioning

confidence: 99%

Efficacy of Ozone to Reduce Chlorinated Disinfection By-Products in Quebec (Canada) Drinking Water Facilities

Meite

Fotsing

Barbeau

2014

Ozone: Science & Engineering

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The impact of ozonation on the reduction of chlorinated disinfection by-products formation was investigated in 15 full-scale and lab-scale drinking water facilities of Québec (Canada). Total trihalomethanes (TTHM) and the sum of six haloacetic acids (HAA6) were measured after chlorination under uniform formation conditions (UFC). Results showed that before ozonation TTHM and HAA6 average concentrations were 89.4 and 45.3 μg/L, respectively. In full-scale ozonation conditions TTHM-UFC and HAA6-UFC reductions averaged respectively 27 and 32%. After lab-scale ozonation at a O 3 /C of 1:1, a decrease of only 9% of TTHM was calculated, while for HAA6, reduction was not significantly impacted (30%). For BDOC, average concentrations of 0.13, 0.46, and 0.69 mg C/L were measured before and after and lab-scale ozonation, respectively. Chlorine demand (Cl 2 D) and immediate ozone demand (IOD) were found to be the most appropriate indicators to evaluate NOM reactivity after ozonation.

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The Photo-Fenton System

Lee

Seo

Pham

2022

Springer Handbook of Inorganic Photochemistry

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Investigation of Ozone Reaction in River Waters Causing Instantaneous Ozone Demand

Cited by 27 publications

References 0 publications

Influence of Seasonal Variation of Water Temperature and Dissolved Organic Matter on Ozone and OH Radical Reaction Kinetics During Ozonation of a Lake Water

Influence of Seasonal Variation of Water Temperature and Dissolved Organic Matter on Ozone and OH Radical Reaction Kinetics During Ozonation of a Lake Water

Efficacy of Ozone to Reduce Chlorinated Disinfection By-Products in Quebec (Canada) Drinking Water Facilities

The Photo-Fenton System

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