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Subsurface transport behavior of micro-nano bubbles and potential applications for groundwater remediation.

Li H, Hu L, Song D, Al-Tabbaa A - Int J Environ Res Public Health (2013)

Bottom Line: The permeability of MNB water through sand was compared with that of air-free water.The results show that the bubble diameter distribution is influenced by the surfactant concentration in the water.The results are meaningful and instructive in the further study of MNB research and applications in groundwater bioremediation.

View Article: PubMed Central - PubMed

Affiliation: Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China. lihengzhen09@gmail.com.

ABSTRACT
Micro-nano bubbles (MNBs) are tiny bubbles with diameters on the order of micrometers and nanometers, showing great potential in environmental remediation. However, the application is only in the beginning stages and remains to be intensively studied. In order to explore the possible use of MNBs in groundwater contaminant removal, this study focuses on the transport of MNBs in porous media and dissolution processes. The bubble diameter distribution was obtained under different conditions by a laser particle analyzer. The permeability of MNB water through sand was compared with that of air-free water. Moreover, the mass transfer features of dissolved oxygen in water with MNBs were studied. The results show that the bubble diameter distribution is influenced by the surfactant concentration in the water. The existence of MNBs in pore water has no impact on the hydraulic conductivity of sand. Furthermore, the dissolved oxygen (DO) in water is greatly increased by the MNBs, which will predictably improve the aerobic bioremediation of groundwater. The results are meaningful and instructive in the further study of MNB research and applications in groundwater bioremediation.

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Experimental procedure.
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ijerph-11-00473-f002: Experimental procedure.

Mentions: The experimental procedure is shown in Figure 2. The MNB size distribution in water was analyzed under three generation conditions: deionized water with surfactant concentration 0 mg/L, 5 mg/L and 10 mg/L, respectively. After the MNB generation, samples were immediately collected for particle size analysis. The analysis time was shorter than 90 s, which is much less than the long existence time of MNBs observed by the authors and reported in previous research [15], so the bubble size change during the analysis time can be neglected. For each condition, three replicates were done to ensure the precision of the testing results.


Subsurface transport behavior of micro-nano bubbles and potential applications for groundwater remediation.

Li H, Hu L, Song D, Al-Tabbaa A - Int J Environ Res Public Health (2013)

Experimental procedure.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3924455&req=5

ijerph-11-00473-f002: Experimental procedure.
Mentions: The experimental procedure is shown in Figure 2. The MNB size distribution in water was analyzed under three generation conditions: deionized water with surfactant concentration 0 mg/L, 5 mg/L and 10 mg/L, respectively. After the MNB generation, samples were immediately collected for particle size analysis. The analysis time was shorter than 90 s, which is much less than the long existence time of MNBs observed by the authors and reported in previous research [15], so the bubble size change during the analysis time can be neglected. For each condition, three replicates were done to ensure the precision of the testing results.

Bottom Line: The permeability of MNB water through sand was compared with that of air-free water.The results show that the bubble diameter distribution is influenced by the surfactant concentration in the water.The results are meaningful and instructive in the further study of MNB research and applications in groundwater bioremediation.

View Article: PubMed Central - PubMed

Affiliation: Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China. lihengzhen09@gmail.com.

ABSTRACT
Micro-nano bubbles (MNBs) are tiny bubbles with diameters on the order of micrometers and nanometers, showing great potential in environmental remediation. However, the application is only in the beginning stages and remains to be intensively studied. In order to explore the possible use of MNBs in groundwater contaminant removal, this study focuses on the transport of MNBs in porous media and dissolution processes. The bubble diameter distribution was obtained under different conditions by a laser particle analyzer. The permeability of MNB water through sand was compared with that of air-free water. Moreover, the mass transfer features of dissolved oxygen in water with MNBs were studied. The results show that the bubble diameter distribution is influenced by the surfactant concentration in the water. The existence of MNBs in pore water has no impact on the hydraulic conductivity of sand. Furthermore, the dissolved oxygen (DO) in water is greatly increased by the MNBs, which will predictably improve the aerobic bioremediation of groundwater. The results are meaningful and instructive in the further study of MNB research and applications in groundwater bioremediation.

Show MeSH
Related in: MedlinePlus