Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

John, Alexander; Carra, Irene; Jefferson, Bruce; Jodkowska, Monika; Brookes, Adam; Jarvis, Peter

doi:10.1016/j.cej.2022.134854

Cited by 24 publications

(3 citation statements)

References 39 publications

(41 reference statements)

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“…The authors argued about a possible higher ozone concentration in the liquid film in microbubbles relying on •OH radical scavenger experiments. Opposing this view, Brookes and co-workers ( 55 ) reported no substantial evidence on a higher •OH radical production induced by microbubbles in water compared to standard aeration systems with ozone. They proposed that •OH generation is primarily connected to ozone self-decomposition, suggesting that alternative mechanisms for •OH production, such as microbubble collapse, may be of negligible significance or absent under the pH conditions examined and within the prevailing bubble size distribution.…”

Section: Discussionmentioning

confidence: 97%

Microstructured gas-liquid-(solid) interfaces: A platform for sustainable synthesis of commodity chemicals

Wang,

Pera-Titus

2024

Sci. Adv.

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Gas-liquid-solid catalytic reactions are widespread in nature and man-made technologies. Recently, the exceptional reactivity observed on (electro)sprayed microdroplets, in comparison to bulk gas-liquid systems, has attracted the attention of researchers. In this perspective, we compile possible strategies to engineer catalytically active gas-liquid-(solid) interfaces based on membrane contactors, microdroplets, micromarbles, microbubbles, and microfoams to produce commodity chemicals such as hydrogen peroxide, ammonia, and formic acid. In particular, particle-stabilized microfoams, with superior upscaling capacity, emerge as a promising and versatile platform to conceive high-performing (catalytic) gas-liquid-(solid) nanoreactors. Gas-liquid-(solid) nanoreactors could circumvent current limitations of state-of-the-art multiphase reactors (e.g., stirred tanks, trickle beds, and bubble columns) suffering from poor gas solubility and mass transfer resistances and access gas-liquid-(solid) reactors with lower cost and carbon footprint.

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Section: Discussionmentioning

confidence: 97%

Microstructured gas-liquid-(solid) interfaces: A platform for sustainable synthesis of commodity chemicals

Wang,

Pera-Titus

2024

Sci. Adv.

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“…The ozonator (OZ-5) was purchased from MAT Filtration Technologies™, which can convert the oxygen to ozone by the corona-discharge method [33]. The output flow rate OH) that is even more reactive as a nonselective oxidant [13,14].…”

Section: Ozone-nanobubble Solution Preparationmentioning

confidence: 99%

“…The ozonator (OZ-5) was purchased from MAT Filtration Technologies™, which can convert the oxygen to ozone by the corona-discharge method [33]. The output flow rate and concentration of ozone produced by OZ-5 were approximately 5 g/h and 5 L/min using dried air as the gas source, respectively.…”

Section: Ozone-nanobubble Solution Preparationmentioning

confidence: 99%

Nanobubble Technology Enhanced Ozonation Process for Ammonia Removal

Tian

Zhang³

et al. 2022

Water

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Ozone (O3) has been widely used for water and wastewater treatment due to its strong oxidation ability, however, the utilization efficiency of O3 is constrained by its low solubility and short half-life during the treatment process. Thereby, an integrated approach using novel nanobubble technology and ozone oxidation method was studied in order to enhance the ozonization of ammonia. Artificial wastewater (AW) with an initial concentration of 1600 mg/L ammonia was used in this study. In the ozone-nanobubble treatment group, the concentration of nano-sized bubbles was 2.2 × 107 particles/mL, and the bubbles with <200 nm diameter were 14 times higher than those in the ozone-macrobubble treatment control group. Ozone aeration was operated for 5 min in both nanobubble treatment and control groups, however, the sampling and measurement were conducted for 30 min to compare the utilization of O3 for ammonia oxidation. H+ was the by-product of the ammonia ozonation process, thus the pH decreased from 8 to 7 and 7.5 in nanobubble treatment and control groups, respectively, after 30 min of operation. The fast removal of ammonia was observed in both systems in the first 10 min, where the concentration of ammonia decreased from 1600 mg/L to 835 and 1110 mg/L in nanobubble treatment and control groups, respectively. In the nanobubble treatment group, ammonia concentrations kept the fast-decreasing trend and reached the final removal performance of 82.5% at the end of the experiment, which was significantly higher than that (44.2%) in the control group. Moreover, the first-order kinetic model could be used to describe the removal processes and revealed a significantly higher kinetic rate constant (0.064 min−1) compared with that (0.017 min−1) in the control group. With these results, our study highlights the viability of the proposed integrated approach to enhance the ozonation of a high level of ammonia in contaminated water.

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Machine learning-aided characterization of microbubbles for venturi bubble generator

Ruan

Zhou²,

Ding

et al. 2023

Chemical Engineering Journal

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Are microbubbles magic or just small? a direct comparison of hydroxyl radical generation between microbubble and conventional bubble ozonation under typical operational conditions

Cited by 24 publications

References 39 publications

Microstructured gas-liquid-(solid) interfaces: A platform for sustainable synthesis of commodity chemicals

Microstructured gas-liquid-(solid) interfaces: A platform for sustainable synthesis of commodity chemicals

Nanobubble Technology Enhanced Ozonation Process for Ammonia Removal

Machine learning-aided characterization of microbubbles for venturi bubble generator

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