The application of surfactant colloidal gas aphrons to remediate contaminated soil: A review

Tao, Wei; Mei, Changgen; Hamzah, N.

doi:10.1016/j.jconhyd.2020.103620

Cited by 12 publications

(7 citation statements)

References 67 publications

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“…In addition, one unique function was provided: it was possible to create hyperoxygenated reaction conditions by generating microbubbles in the solvent. In recent bioremediation technologies, the application of micro-nano bubble technology has begun to be discussed ( 30 – 32 ), and we argue in this study that this technology is also useful for the cleanup of PCBs. Biphenyl dioxygenase as BphA introduces two oxygen atoms into PCB, requiring a sufficient amount of oxygen molecules.…”

Section: Discussionmentioning

confidence: 78%

Augmentation of an Engineered Bacterial Strain Potentially Improves the Cleanup of PCB Water Pollution

et al. 2021

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Section: Discussionmentioning

confidence: 78%

Augmentation of an Engineered Bacterial Strain Potentially Improves the Cleanup of PCB Water Pollution

et al. 2021

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“…Though CGA generation has been observed at 8000 rpm or lower mixing speeds in some previous studies (Longe, 1989; Sebba, 1985), no CGA generation was observed at 8000 rpm. As described in the previous literature, the generation of CGAs depends on a wide variety of setup‐specific parameters including shape and dimensions of rotary device, dimensions of the CGA generation container, configuration of baffles, and concentration and type of surfactants (Longe, 1989; Tao, 2020). Therefore, variability between various studies utilizing different equipment is expected.…”

Section: Resultsmentioning

confidence: 99%

“…Here, the average half‐life of CGAs was estimated to be a few minutes based on the increase in dye concentration after the initial removal period. The observed reduction in dye removal over time, or liquid drainage, can be avoided in future laboratory tests or field applications by designing a more efficient and continuous CGA foam layer extraction step, to ensure that CGAs have a retention time of <7 min in the separation column (Molaei and Waters, 2015; Tao et al., 2020).…”

Section: Resultsmentioning

confidence: 99%

“…They are formed by mixing gases, water, and surfactants in a high‐shear environment. CGAs have powerful sorbent properties via electrostatic interactions and have shown the ability to separate dyes, proteins in the food industry, heavy metals, and contaminants such as trichloroethylene from water with high‐performance levels (95%–98% removal; Basu & Malpani, 2001; Hashim et al, 2012; Tao et al, 2020). CGAs are very different from air bubbles: they are fundamentally a different structure; they are significantly smaller, with diameters of approx.…”

Section: Introductionmentioning

confidence: 99%

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Process to separate per‐ and polyfluoroalkyl substances from water using colloidal gas aphrons

Kulkarni

Aranzales

Javed

et al. 2022

Remediation Journal

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Current ex situ per-and polyfluoroalkyl substances (PFAS) remediation strategies often involve the treatment of large volumes of PFAS-impacted water via separation processes to concentrate PFAS for subsequent treatment or disposal. This study presents a new method for concentrating PFAS that relies on colloidal gas aphrons (CGAs), unusual microstructures composed of water, multilayers of surfactants, and air, that can be used for separation via electrostatic and hydrophobic sorption. This study successfully demonstrates the efficacy of CGAs in removing ionic dyes (as PFAS surrogates) (81%-91%), as well as ultra-short and short-chain PFAS (60%-90%) and perfluorooctanoic acid (PFOA, 88%) within 10 min. However, poor removal of perfluorooctane sulfonic acid (PFOS, 0%) was observed within 10 min of treatment. Compared to bubbling with nitrogen alone, and nitrogen with cetrimonium bromide (CTAB) in bulk solution, CGAs demonstrate significantly higher removal of perfluorobutanoic acid, a short-chain PFAS (0% for N 2 , 11% for N 2 + CTAB, and 90% for CGAs). These results suggest that CGAs may serve as a promising new separation and concentration technology for removing a suite of PFAS from water, particularly for difficult to remove short-chained compounds.

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“…Surfactants as the surface-active agent were found to modify the surface hydrophobicity of bacteria and fungi, thereby affecting the degradation activity [21][22][23][24][25]. For example, rhamnolipid and tergitol could alter the hydrophobicity of R. erythropolis 3586 and hydrophilicity of P. putida 852 to different extents [26].…”

Section: Introductionmentioning

confidence: 99%

Effect of rhamnolipid on the physicochemical properties and interaction of bacteria and fungi

et al. 2020

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Bacterial adhesion on surfaces is an essential initial step in promoting bacterial mobilization for soil bioremediation process. Modification of the cell surface is required to improve the adhesion of bacteria. The modification of physicochemical properties by rhamnolipid to Pseudomonas putida KT2442, Rhodococcus erythropolis 3586 and Aspergillus brasiliensis ATCC 16404 strains was analysed using contact angle measurements. The surface energy and total free energy of adhesion were calculated to predict the adhesion of both bacteria strains on the A. brasiliensis surface. The study of bacterial adhesion was carried out to evaluate experimental value with the theoretical results. Bacteria and fungi physicochemical properties were modified significantly when treated with rhamnolipid. The adhesion rate of P. putida improved by 16% with the addition of rhamnolipid (below 1 CMC), while the increase of rhamnolipid concentration beyond 1 CMC did not further enhance the bacterial adhesion. The addition of rhamnolipid did not affect the adhesion of R. erythropolis. A good relationship has been obtained in which water contact angle and surface energy of fungal surfaces are the major factors contributing to the bacterial adhesion. The adhesion is mainly driven by acid-base interaction. This finding provides insight to the role of physicochemical properties in controlling the bacterial adhesion on the fungal surface to enhance bacteria transport in soil bioremediation.

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The application of surfactant colloidal gas aphrons to remediate contaminated soil: A review

Cited by 12 publications

References 67 publications

Augmentation of an Engineered Bacterial Strain Potentially Improves the Cleanup of PCB Water Pollution

Augmentation of an Engineered Bacterial Strain Potentially Improves the Cleanup of PCB Water Pollution

Process to separate per‐ and polyfluoroalkyl substances from water using colloidal gas aphrons

Effect of rhamnolipid on the physicochemical properties and interaction of bacteria and fungi

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