The use of micro-nano bubbles in groundwater remediation: A comprehensive review

Haris, Sabeera; Qiu, Xiaobin; Klammler, Harald; Mohamed, Mohamed M.

doi:10.1016/j.gsd.2020.100463

Cited by 55 publications

(27 citation statements)

References 144 publications

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“…6 After 2000, experimental reports on nanobubbles emerged due to the extensive use of advanced experimental techniques, such as dynamic light scattering (DLS), phase microscopy, infrared spectroscopy and nanoparticle tracking analyzers (NTA). [7][8][9][10] Bulk nanobubbles have aroused strong interest due to their long lifetime and numerous applications, such as water treatment, [11][12][13][14] agriculture, 15,16 biomedicine, 17,18 and micro-reactors. 19 The unexpected stability of bulk nanobubbles seems to contradict the classical theory.…”

Section: Introductionmentioning

confidence: 99%

Stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions

Chen

Zhang

2022

Preprint

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In our previous work [Phys. Chem. Chem. Phys. 2022, 24, 9685], we show with molecular dynamics simulations that bulk nanobubbles can be stabilized by forming a compressed amphiphile monolayer at bubble interfaces. This observation closely resembles the stability origin of microemulsions and inspires us to propose here that stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions: the gas-in-water nanobubble phase coexisting with the external gas phase. The stability mechanism for bulk nanobubbles is then given: The formation of compressed amphiphilic monolayer because of microbubble shrinking leads to a vanishing surface tension, and consequently the curvature energy of the monolayer dominates the thermodynamic stability of bulk nanobubbles. With the monolayer model, we further interpret several strange behaviors of bulk nanobubbles: the gas supersaturation is not a prerequisite for nanobubble stability because of the vanishing surface tension, and the typical nanobubble size of 100nm is due to the small bending constant of the monolayer. Finally, through analyzing the compressed amphiphile monolayer model we propose that bulk nanobubbles can ubiquitously exist in aqueous solutions.

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Section: Introductionmentioning

confidence: 99%

Stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions

Chen

Zhang

2022

Preprint

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“…MB and NB technology has also been employed in the restoration of groundwater contaminated with organics or metals. 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 .…”

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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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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“…Groundwater pollution problems have gained global attention in recent decades due to their frequent occurrence and potentially adverse effects on aquatic ecosystems and human health (Kuroda and Kobayashi 2021). Many studies have focused on the pollution of groundwater and its remediation (e.g., Haris et al 2020), which may depend on advanced technologies and its sustainability. Recent reports that address these issues include: (Balestrini et al 2021) and 12-Assessing how the use of plastic in farming processes may affect water quality; accordingly, aquifers and drinking water supplies should be protected from plastic and pesticide contaminants and thus reduce potential human health hazards (Wanner, 2021).…”

Section: Polluted Groundwater and Covid-19mentioning

confidence: 99%