Remediation of NAPL-contaminated porous media using micro-nano ozone bubbles: Bench-scale experiments

Kwon, Hobin; Mohamed, Mohamed M.; Annable, Michael D.; Kim, Heonki

doi:10.1016/j.jconhyd.2019.103563

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…O 3 -MB and O 3 -NB technology have been employed in groundwater restoration for removal of various representative organic contaminants, such as methyl orange, 195 monoaromatic hydrocarbons (benzene, chlorobenzene, nitrobenzene, and nitro-chlorobenzene), 165 and n-decane. 196 Zhang et al developed a functionalized bubble system, colloidal ozone aphrons, which consisted of multilayer surfactant and encapsulated O 3 -MBs to remove the phenanthrene from the aquifer sediment. 197 O 3 -NBs coupled with ultrasound have been proposed for remediating river sediment contaminated with diverse organic pollutants.…”

Section: Ecological Restorationmentioning

confidence: 99%

“…The details can be found in a recent review by Haris et al and are not discussed here. O 3 -MB and O 3 -NB technology have been employed in groundwater restoration for removal of various representative organic contaminants, such as methyl orange, monoaromatic hydrocarbons (benzene, chlorobenzene, nitrobenzene, and nitro-chlorobenzene), and n -decane . Zhang et al developed a functionalized bubble system, colloidal ozone aphrons, which consisted of multilayer surfactant and encapsulated O 3 -MBs to remove the phenanthrene from the aquifer sediment .…”

Section: Ecological Restorationmentioning

confidence: 99%

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Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

et al. 2022

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Microbubbles (MBs) and nanobubbles (NBs) refer to bubbles of micrometer to nanometer sizes. Due to several unique attributes, including long-term stability, negative surface charge, and the ability to generate reactive oxygen species, MB and NB technology has garnered significant attention in water and wastewater treatment and ecological restoration. Recently, several studies have shown the beneficial effects of MBs and NBs in membrane defouling, pathogen deactivation, environmental remediation, etc. However, there is limited knowledge of the physical and biochemical interactions between MBs and NBs and microbial communities; the mechanistic roles of MBs and NBs on micropollutants removal during aerobic wastewater treatment and anaerobic digestion; and the engineering limitations on versatility and scalability of MB and NB technology, among others. This review fills this gap by providing a systematic discussion on the fundamentals of MBs and NBs, including their size and concentration, physicochemical properties, and generation methods. The latest advances on MB and NB applications to water and wastewater treatment and ecological restoration are then critically discussed. The review thus identifies the challenges of implementing MB and NB technology and concludes with future research directions for a broader understanding of MB and NB technology.

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Section: Ecological Restorationmentioning

confidence: 99%

Section: Ecological Restorationmentioning

confidence: 99%

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

et al. 2022

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“…of the rate of ozone use in wastewater is also extremely low (Orge et al 2011;Pugazhenthiran et al 2011). A Micro-nano-bubble (MNB) generator could solve this problem as it can dissolve air, oxygen, ozone, carbon dioxide, and other gases into the water with bubbles between microns and nanometers (Fan et al 2020;Kwon et al 2020). MNBs, in comparison to normal bubbles, have a specific surface area, slow rising speed, self-pressurized dissolution, a high surface charge, and high mass transfer efficiency (Seddon et al 2012;Hu & Xia 2018;Gao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Treatment of organic pollutants in coke plant wastewater by micro-nanometer catalytic ozonation, A/A/O and reverse osmosis membrane

Feng

Wang

Kang

et al. 2022

Water Science and Technology

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Coking wastewater has a complex and highly concentrated chemical composition, which is toxic and does not biodegrade easily. Treating the organic pollutants in this wastewater is very challenging. The toxic substances in this wastewater make traditional biotechnological treatments inefficient. Current wastewater treatment studies are based on unit processes, and no full process studies could be found. This study used the micro-nano ozone catalytic process as a pretreatment unit, and reverse osmosis membrane treatment as a depth processing unit to improve the effect of the coking wastewater degradation. The micro-nano ozone catalytic pretreatment greatly improves the biodegradability of the coking wastewater and promotes the coking wastewater degradation in the Anoxia-Anaerobic-oxic (A/A/O) system. The integrated coagulation air flotation-micro nano ozone catalytic-A/A/O-reverse osmosis membrane system can remove 98% of the chemical oxygen demand (COD), which meets the direct emission standard of the new national standard (China). The dominant genera in the A/A/O biochemical reactor were Thioalkalimicrobium, Proteiniphilum, Azoarcu, bacillus, Fontibacter, Taibaiella. This work provides a novel approach for the degradation of high-concentration organic wastewater and lays a solid foundation for the restoration of environmental water bodies.

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“…Micronanobubbles (MNBs) are tiny bubbles with diameters of 200 nm–50 μm. They have small diameters, large specific surface areas, and low rising velocities in the liquid phase, so they can persist for long periods and significantly improve gas solubility. , Due to their superior mass transfer characteristics, MNBs have received attention in the fields of bioprocesses and groundwater remediation. , However, most of the studies on MNBs focused on their generation, characterization, and physical properties in aqueous solutions and the effects of application . Reports about the mass transfer of MNBs are still limited.…”

Section: Introductionmentioning

confidence: 99%

Prediction and Experimental Study of Mass Transfer Properties of Micronanobubbles

Bai

Liu

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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In order to study the mass transfer efficiency of micronanobubbles (MNBs), an equation of the volumetric mass transfer coefficient (k L a) was proposed based on theory and dimensionless numbers. It was verified by experimental data from different literature sources. Then, the k L a in an MNB column was measured under the conditions of different salt concentrations. The test results showed that the equation could successfully predict the k L a in an MNB column of not only this research but also other literature. In the MNB column, when the salt concentration increased from 0.0 to 3.0 g/L, the values of the Sauter mean bubble diameter (d BS ), gas holdup (ε), and specific gas−liquid interface (a) had remarkable changes. Salt coalescence suppression was the governing effect for the hydrodynamic variables, and it was more prominent for common bubbles than for MNBs. The value of the k L a in the MNB column was an order of magnitude larger than that in the common bubble column, and it was improved significantly in salt solution. Hydrodynamic variables were dominant effects of mass transfer. Overall, the prediction equation of the k L a provides a reference for the mass transfer rate calculation of MNBs.

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Remediation of NAPL-contaminated porous media using micro-nano ozone bubbles: Bench-scale experiments

Cited by 14 publications

References 36 publications

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

Treatment of organic pollutants in coke plant wastewater by micro-nanometer catalytic ozonation, A/A/O and reverse osmosis membrane

Prediction and Experimental Study of Mass Transfer Properties of Micronanobubbles

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