Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Agarwal, Kalyani; Trivedi, Mohit; Nirmalkar, Neelkanth

doi:10.1016/j.ultsonch.2021.105860

Cited by 27 publications

(34 citation statements)

References 40 publications

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“…The SBR process had also a high ability to remove nitrogen because of the occurring nitrification process. As a final deduction about all the mentioned results, it was confirmed that the NB aeration system could give considerably promoted efficiencies in all terms of the tested treatment effective parameters (Agarwal et al, 2022a;Agarwal et al, 2022b;Harsh Sharma and Nirmalkar, 2022;Li and Zhang, 2022).…”

Section: Discussionmentioning

confidence: 54%

“…However, there is a lack of information about the comparison of the removal efficiency of pollutants in wastewater treatment systems using FB and NB aeration (Agarwal et al, 2022a;Agarwal et al, 2022b;Harsh Sharma and Nirmalkar, 2022;Li and Zhang, 2022). Hence, this research work aimed to experimentally compare the efficiency of FB and NB aeration in treating wastewater through the SBR system.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

et al. 2022

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The aerobic wastewater treatments depend on the aeration. Hence, the size of the bubbles used in the aeration system may play a crucial role in this regard. This study attempted to investigate the effects of aeration bubble size on wastewater treatment efficiency of a “sequence batch reactor” (SBR) system at a laboratory scale using a novel designed fine/nanobubble forming instrumentation system. Based on the presence of microorganisms in the stationary phase, chemical oxygen demand removal efficiency on the 15th day (80.0 and 95.0%) was majorly better than on the 10th and 15th days in fine and nanobubble aeration systems. Moreover, with increasing sludge age, the “sludge volumetric index” (SVI) increased up to 170.0 ml g−1 on the 15th day. In addition, sludge rate and F/M ratio were much higher and expressively less in the nanobubble system rather than in the fine-bubbles system in which sludge was majorly denser. Therefore, the sludge was more easily deposited and the percentage of dry sludge was higher compared with the fine-bubble system. Thus, oxygen and specific oxygen uptake rate consumption were significantly reduced. The efficiency of the phosphorus removal was estimated to be between 54.0–60.0% for nanobubble aeration, compared to the general systems such as the SBR (10–20%) under similar conditions. In addition, the efficiency of the nitrogen removal in the nanobubble aeration system with different densities of 40.0, 50.0, and 60.0 ml g−1 was found as 99.0%, relatively higher compared to fine bubble with 96.0% nitrogen efficiency. In conclusion, a nanobubble aeration system could give considerably promoted efficiencies in all terms of the tested treatment effective parameters.

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

et al. 2022

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“…NTA (nanoparticle tracking analysis) and DLS (dynamic light scattering) were used to characterize the nanobubble sample under atmospheric conditions . The results were presented in terms of the bubble size distribution, concentration of nanobubbles, bubble diameters, and zeta potential.…”

Section: Materials and Methodologiesmentioning

confidence: 99%

“…NTA (nanoparticle tracking analysis) and DLS (dynamic light scattering) were used to characterize the nanobubble sample under atmospheric conditions. 38 The results were presented in terms of the bubble size distribution, concentration of nanobubbles, bubble diameters, and zeta potential. The concentration of nanobubbles increases monotonically with time, and the mean diameter lies in the range of 100−120 nm as shown in Figure 2b.…”

Section: Nanobubble Generationmentioning

confidence: 99%

Augmenting the Leidenfrost Temperature of Droplets via Nanobubble Dispersion

et al. 2022

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Droplets may rebound/levitate when deposited over a hot substrate (beyond a critical temperature) due to the formation of a stable vapor microcushion between the droplet and the substrate. This is known as the Leidenfrost phenomenon. In this article, we experimentally allow droplets to impact the hot surface with a certain velocity, and the temperature at which droplets show the onset of rebound with minimal spraying is known as the dynamic Leidenfrost temperature (T DL ). Here we propose and validate a novel paradigm of augmenting the T DL by employing droplets with stable nanobubbles dispersed in the fluid. In this first-of-itskind report, we show that the T DL can be delayed significantly by the aid of nanobubble-dispersed droplets. We explore the influence of the impact Weber number (We), the Ohnesorge number (Oh), and the role of nanobubble concentration on the T DL . At a fixed impact velocity, the T DL was noted to increase with the increase in nanobubble concentration and decrease with an increase in impact velocity for a particular nanobubble concentration. Finally, we elucidated the overall boiling behaviors of nanobubble-dispersed fluid droplets with the substrate temperature in the range of 150− 400 °C against varied impact We through a detailed phase map. These findings may be useful for further exploration of the use of nanobubble-dispersed fluids in high heat flux and high-temperature-related problems and devices.

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“…The refractive index of NBs was taken as 1. 58 For each experimental condition, several samples of NBs were prepared at different dilution factors and ζ were measured. The primary rationale for diluting the NBs concentrations was a relatively high NBs concentration per 1 mL of solution.…”

Section: ζ-Potential Measurement the Electrical Potential Of Bubbles ...mentioning

confidence: 99%

Experimental Investigation of Cavitation Bulk Nanobubbles Characteristics: Effects of pH and Surface-Active Agents

et al. 2023

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Nanobubbles (NBs) have a widespread application in antimicrobial activity, wastewater treatment, and ecological restoration due to numerous peculiar characteristics, such as small diameter, long-term stability, and ability to produce hydroxyl radicals. Despite significant applications, only limited comprehensive investigations are available on the role of surfactants and pH in NBs characteristics. Therefore, this study examines the effects of different surfactants (i.e., anionic, cationic, and nonionic) and pH medium on bulk NB formation, diameter, concentration, bubble size distribution (BSD), ζ-potential, and stability. The effect of surfactant at concentrations above and below the critical micelle concentration was investigated. NBs were generated in deionized (DI) water using a piezoelectric transducer. The stability of NBs was assessed by tracking the variation in diameter and concentration over time. In a neutral medium, the diameter of NBs is smaller than in other surfactant or pH mediums. The diameter, concentration, BSD, and stability of NBs are strongly influenced by the ζ-potential rather than the solution medium. BSD curve shifts to a smaller bubble diameter when the magnitude of ζ-potential is high in any solution. In pure water, surfactant, and pH mediums, NBs have existed for a long time. NBs have a shorter life span in environments with a pH ≤ 3. Surfactant adsorption on the surface of NBs increases with increasing surfactant concentration up to a certain limit, beyond which it declines substantially. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to interpret the NBs stability, resulting in a total potential energy barrier that is positive and greater than 45.55 k B T for 6 ≤ pH ≤ 11, whereas for pH < 6, the potential energy barrier essentially vanishes. Moreover, an effort has also been made to explicate the plausible prospect of ion distribution and its alignment surrounding NBs in cationic and anionic surfactants. This study will extend the in-depth investigation of NBs for industrial applications involving NBs.

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Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation?

Cited by 27 publications

References 40 publications

Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

Efficient Wastewater Treatment via Aeration Through a Novel Nanobubble System in Sequence Batch Reactors

Augmenting the Leidenfrost Temperature of Droplets via Nanobubble Dispersion

Experimental Investigation of Cavitation Bulk Nanobubbles Characteristics: Effects of pH and Surface-Active Agents

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