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Int. J. Environ. Res. Public Health 2014, 11(1), 473-486; doi:10.3390/ijerph110100473
Article

Subsurface Transport Behavior of Micro-Nano Bubbles and Potential Applications for Groundwater Remediation

1
,
1,* , 2
 and
3
1 Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 2 In Situ Solution China Co., Ltd, Nanjing 211106, China 3 Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
* Author to whom correspondence should be addressed.
Received: 24 October 2013 / Revised: 12 December 2013 / Accepted: 20 December 2013 / Published: 30 December 2013
(This article belongs to the Special Issue IJERPH: 10th Anniversary)
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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.
Keywords: micro-nano bubbles (MNBs); size distribution; hydraulic conductivity; dissolved oxygen (DO) micro-nano bubbles (MNBs); size distribution; hydraulic conductivity; dissolved oxygen (DO)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Li, H.; Hu, L.; Song, D.; Al-Tabbaa, A. Subsurface Transport Behavior of Micro-Nano Bubbles and Potential Applications for Groundwater Remediation. Int. J. Environ. Res. Public Health 2014, 11, 473-486.

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