Impact of Groundwater Salinity on Bioremediation Enhanced by Micro-Nano Bubbles

Li, Hengzhen; Hu, Liming; Xia, Zhiran

doi:10.3390/ma6093676

Cited by 57 publications

(39 citation statements)

References 34 publications

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“…The interface charge is easily influenced by such parameters as electrolyte concentration. Thus, when water into which NaCl is dissolved is nano-bubbled, Na + is adsorbed as a counter ion for the excess OH− at the interface [28]. In this study, at salinity of 1.5 g/L, an equilibrium state at the interface was likely achieved with minimum zeta potential value.…”

Section: Effect Of Electrolyte Concentrationmentioning

confidence: 70%

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Tekile

Kim

Lee

2016

Environmental Engineering Research

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In this study, change in water-dissolved oxygen (DO) was analyzed under various synthetic water qualities and nanobubbles (NBs) application conditions, such as gas type, initial DO as well as water dissolved, suspended and organic matters contents. When oxygen, rather than air, was introduced into nitrogen-desorbed ultra-pure water, the stagnation time was significantly increased. It took ten days for DO concentration to drop back to saturation. The higher the initial DO concentration, the longer particles were observed above saturation due to particle stability improvement. The oxygen mass transfer rate of 0.0482 mg/L/min was found to reach a maximum at an electrolytic concentration of 0.75 g/L, beyond which the transfer rate decreased due to adsorption of negative ions of the electrolyte at the interface. High levels of turbidity caused by suspended solids have become a barrier to dissolution of NBs oxygen into the water solution, and thus affected the transfer performance. On the other hand, by applying NBs for just an hour, up to 7.2% degradation of glucose as representative organic matter was achieved. Thus, NBs technology would maintain a high DO extent for an extended duration, and thus can improve water quality provided that water chemistry is closely monitored during its application.

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Section: Effect Of Electrolyte Concentrationmentioning

confidence: 70%

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Tekile

Kim

Lee

2016

Environmental Engineering Research

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“…Consequently, the long lasting MNBs would stay in pore water until dissolved. Li et al (2013Li et al ( , 2014 studied the hydraulic conductivities of sand for MNB water with different salt concentrations, demonstrating that MNBs would not reduce the groundwater mobility in high permeability aquifer. Therefore, MNB aeration offers the potential for enhancing aerobic bioremediation effect, comparing compared with the traditional air sparging technology of injecting macrobubbles.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Micro‐Nano Bubbles and Potential Application in Groundwater Bioremediation

Song

et al. 2014

Water Environment Research

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Content of oxygen in water is a critical factor in increasing bioremediation efficiency for contaminated groundwater. Micro-nano bubbles (MNBs) injection seems to be an effective technique for increasing oxygen in water compared with traditional air sparging technology with macrobubbles. Micro-nano bubbles have larger interfacial area, higher inner pressure and density, and lower rising velocity in water, superior to that of macrobubbles. In this paper, MNBs with diameters ranging from 500 nm to 100 lm are investigated, with a specific focus on the oxygen mass transfer coefficient from inner bubbles to surrounding water. The influence of surfactant on the bubbles formation and dissolution is studied as well. The stability of MNBs is further investigated by means of zeta potential measurements and rising velocity analysis. The results show that MNBs can greatly increase oxygen content in water. Higher surfactant concentration in water will decrease the bubbles size, reduce the dissolution rate, and increase the zeta potential. Moreover, MNBs with greater zeta potential value tend to be more stable. Besides, the low rising velocity of MNBs contributes to the long stagnation in water. It is suggested that micro-nano bubble aeration, a potential in groundwater remediation technology, can largely enhance the bioremediation effect. Water Environ. Res., 86, 844 (2014).

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“…The latter might be related to the balanced air (or nitrogen) nanobubbles covered by hydrophobin HFBII in the sample after shaking, since the HFBII sample before shaking represented only the diameter of the monomeric model. In recent studies, it has been reported that stable nitrogen nanobubbles have a spherical shape with a diameter in the range of 100 to 434 nm . However, more evidence should be obtained before this hypothesis can be established.…”

Section: Resultsmentioning

confidence: 99%

“…In recent studies, it has been reported that stable nitrogen nanobubbles have a spherical shape with a diameter in the range of 100 to 434 nm. [29,30] However, more evidence should be obtained before this hypothesis can be established.…”

Section: Droplet Size Analysismentioning

confidence: 99%

Improvement of the retention of ocimene in water phase using Class II hydrophobin HFBII

Khalesi

Mandelings

Herrera‐Malaver

et al. 2015

Flavour & Fragrance J

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Hydrophobins have exceptional surface activity with potential applications for food and pharmaceutical industry. In this study, the effect of Class II hydrophobin HFBII on the retention of a volatile compound, ocimene in a water phase was investigated. We observed a negative gushing when 200 μg pure HFBII (κ-grade) and 40 μg ocimene (assay ≥ 90%) was added to 1 L sparkling water with CO 2 concentration of 7 g/L. The droplet size analysis of κ-HFBII, ocimene and the mixture of them showed that the ocimene was emulsified in a solution containing κ-HFBII. The stability of this emulsion was reduced in function of time and this effect was intensified by increasing the temperature and the presence of CO 2 . Additionally, the retention of ocimene in a HFBII rich solution was measured by SPME-GC-MS. When 0.26±0.03 mg HFBII/mL is added to ocimene solution, 43% of the original ocimene concentration (i.e. 5.9 × 10 À6 mg/mL) remained in the solution after 3 days, and 32% after 7 days. In contrast, original ocimene concentration in solutions without HFBII was only retained 20% and 14%, respectively. It showed the potential of HFBII to incorporate insoluble flavour compounds in beverages and control their release.

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Impact of Groundwater Salinity on Bioremediation Enhanced by Micro-Nano Bubbles

Cited by 57 publications

References 34 publications

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Extent and persistence of dissolved oxygen enhancement using nanobubbles

Characteristics of Micro‐Nano Bubbles and Potential Application in Groundwater Bioremediation

Improvement of the retention of ocimene in water phase using Class II hydrophobin HFBII

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