A critical review of the recent developments in micro–nano bubbles applications for domestic and industrial wastewater treatment

Sakr, Marwa; Mohamed, Mohamed M.; Maraqa, Munjed A.; Hamouda, Mohamed A.; Hassan, Ashraf Aly; Ali, Jafar; Jung, Jinho

doi:10.1016/j.aej.2021.11.041

Cited by 83 publications

(30 citation statements)

References 131 publications

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“…For example, the use of injectors capable of generating nano-sized bubbles can result in an increase in the ozone interphase mass transfer rate. In this case however, modification to the ozone mass transfer equation (eqs and ) should be made to accommodate the high internal pressure induced by the high surface tension of nanobubbles. , Due to the fast reaction kinetics of FA, use of nanobubbles would enable the liquid HRT to be reduced significantly. For other organic compounds or mixtures of compounds, the optimal HRT will be dependent on the reaction kinetics of the target compounds with OH • .…”

Section: Resultsmentioning

confidence: 99%

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Lian

Jiang

Garg

et al. 2022

Environ. Sci. Technol.

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The efficacy of oxidation of recalcitrant organic contaminants in municipal and industrial wastewaters by ozonation is influenced by chemical reaction kinetics and hydrodynamics within a reactor. A 3D computational fluid dynamics (CFD) model incorporating both multiphase flow and reaction kinetics describing ozone decay, hydroxyl radical ( • OH) generation, and organic oxidation was developed to simulate the performance of continuous flow ozonation reactors. Formate was selected as the target organic in this study due to its well-understood oxidation pathway. Simulation results revealed that the dissolved ozone concentration in the reactor is controlled by rates of O 3 (g) interphase transfer and ozone self-decay. Simulations of the effect of various operating conditions showed that the reaction stoichiometric constraints between formate and ozone were reached; however, complete utilization of gas phase ozone was hard to achieve due to the low ozone interphase mass transfer rate. Increasing the O 3 (g) concentration leads to an increase in the formate removal rate by ∼5% due to an enhancement in the rate of O 3 (g) interphase mass transfer. The CFD model adequately describes the mass transfer occurring in the two-phase flow system and confirms that O 3 (g) interphase mass transfer is the ratelimiting step in contaminant degradation. The model can be used to optimize the ozone reactor design for improved contaminant degradation and ozonation efficiency.

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Section: Resultsmentioning

confidence: 99%

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Lian

Jiang

Garg

et al. 2022

Environ. Sci. Technol.

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“…Compared with acoustic cavitation, hydrodynamic cavitation appears to be the more practical and economical way to generate MB at pilot and industrial scale and at higher rates using a simple centrifugal pump along with a flow confiner like venturi tube, orifice plate, throttling valves (Wang et al 2021). For more information on the micro-bubble generation methods and bubble characterisation techniques, one can refer to these recent articles (Sakr et al 2021).…”

Section: Mb Generationmentioning

confidence: 99%

Contemporary application of microbubble technology in water treatment

Nair

Pinedo‐Cuenca

Stubbs

et al. 2022

Water Science and Technology

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Microbubble technology constitutes a suite of promising low-cost technologies with potential applications in various sectors. Microbubbles (MBs) are tiny gas bubbles with diameter in the micrometre range of 10–100 μm. Along with their small size, they share special characteristics like slow buoyancy, large gas-liquid interfacial area and high mass transfer efficiency. Initially, the review examines the key dissimilarities among the different types of microbubble generators (MBG) towards economic large-scale production of MBs. The applications of MBs to explore their effectiveness at different stages of waste-water treatment extending from aeration, separation/ flotation, ozonation, disinfection and other processes are investigated. A summary of the recent advances of MBs in real and synthetic wastewater treatment, existing research gaps, and limitations in upscaling of the technology, conclusion and future recommendations is detailed. A critical analysis of the energetics and treatment cost of combined approaches of microbubble technology with other advanced oxidation processes (AOPs) is carried out highlighting the potential applicability of hybrid technology in large scale waste-water treatment.

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“…Furthermore, the demand for water in domestic and industrial activities has significantly increased, which has accordingly increased the amount of wastewater that is released into sewage systems. Thus, the reuse and treatment of wastewater have become important concepts in the attempt to increase water availability [2]. The wastewater industry is in a state of transition [3] due to the recent wastewater effluent standards and emerging contaminants such as pharmaceutical and personal care products, and dyes in water bodies [4].…”

Section: Introductionmentioning

confidence: 99%

Wastewater Treatment: Current and Future Techniques

Mojiri

Bashir

2022

Water

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Recently, national and international effluent standards have become more stringent, posing a significant challenge in the water treatment industry. Accordingly, treatment techniques with minimal energy consumption and maximal performance are urgently required for wastewater and water treatments. This topic was investigated from both technical and environmental perspectives to improve water and wastewater treatment techniques and enhance the quality of water bodies. This Special Issue (SI) has attracted investigations by researchers worldwide, including those from Australia, the United States, Finland, Turkey, South Africa, Oman, China, Japan, Malaysia, and Pakistan. In this SI, research and review articles propose and discuss efficient water and wastewater treatment techniques. We hope that the readers of Water can learn about new aspects of wastewater treatment using physicochemical, biological, and hybrid techniques. Finally, we hope that this SI will contribute to the United Nations’ Sustainable Development Goal 6, which is to ensure a secure water supply globally through cost-efficient technologies.

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A critical review of the recent developments in micro–nano bubbles applications for domestic and industrial wastewater treatment

Cited by 83 publications

References 131 publications

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

Contemporary application of microbubble technology in water treatment

Wastewater Treatment: Current and Future Techniques

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