Removal of Mercury by Foam Fractionation Using Surfactin, a Biosurfactant

Chen, Hau-Ren; Chen, Chien‐Cheng; Reddy, A. Siva Rami; Chen, Chien‐Yen; Li, Wun Rong; Tseng, Min‐Jen; Liu, Hung-Tsan; Pan, Wenfeng; Maity, Jyoti Prakash; Atla, Shashi B.

doi:10.3390/ijms12118245

Cited by 39 publications

(13 citation statements)

References 45 publications

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“…Biosurfactants have a tendency to accumulate at the interface of the medium with air once they are produced in the fermentation broth [42]. Thus, many fractionation processes use some form of separation, in which solutes with high surface activity (biosurfactant) are preferentially adsorbed at the interface between a gas phase and bulk liquid phase and are then removed, for example by foaming [36,43,44]. However, solutes with lower surface activity tend to remain in the bulk aqueous phase and can be extracted by the use of organic solvents [42,45].…”

Section: Resultsmentioning

confidence: 99%

Production of Biosurfactant Produced from Used Cooking Oil by Bacillus sp. HIP3 for Heavy Metals Removal

et al. 2019

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Heavy metals from industrial effluents and sewage contribute to serious water pollution in most developing countries. The constant penetration and contamination of heavy metals into natural water sources may substantially raise the chances of human exposure to these metals through ingestion, inhalation, or skin contact, which could lead to liver damage, cancer, and other severe conditions in the long term. Biosurfactant as an efficient biological surface-active agent may provide an alternative solution for the removal of heavy metals from industrial wastes. Biosurfactants exhibit the properties of reducing surface and interfacial tension, stabilizing emulsions, promoting foaming, high selectivity, and specific activity at extreme temperatures, pH, and salinity, and the ability to be synthesized from renewable resources. This study aimed to produce biosurfactant from renewable feedstock, which is used cooking oil (UCO), by a local isolate, namely Bacillus sp. HIP3 for heavy metals removal. Bacillus sp. HIP3 is a Gram-positive isolate that gave the highest oil displacement area with the lowest surface tension, of 38 mN/m, after 7 days of culturing in mineral salt medium and 2% (v/v) UCO at a temperature of 30 °C and under agitation at 200 rpm. An extraction method, using chloroform:methanol (2:1) as the solvents, gave the highest biosurfactant yield, which was 9.5 g/L. High performance liquid chromatography (HPLC) analysis confirmed that the biosurfactant produced by Bacillus sp. HIP3 consists of a lipopeptide similar to standard surfactin. The biosurfactant was capable of removing 13.57%, 12.71%, 2.91%, 1.68%, and 0.7% of copper, lead, zinc, chromium, and cadmium, respectively, from artificially contaminated water, highlighting its potential for bioremediation.

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Section: Resultsmentioning

confidence: 99%

Production of Biosurfactant Produced from Used Cooking Oil by Bacillus sp. HIP3 for Heavy Metals Removal

et al. 2019

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“…Mercury can be readily bound by incorporating it within plate-like crystals of Hg(S-R) 2 [5]. Several other organic molecular systems have also been recently designed, which are capable of efficiently localizing mercury for subsequent disposal [6][7][8]. On the other hand, liquid mercury represents a particular interest in electrowetting applications enabling the construction of highly conducting metallic nanowires inside carbone nanotubes, which is actively studied by both experiment and computer simulation [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Surface tension of liquid mercury: a comparison of density-dependent and density-independent force fields

2015

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Motivated by an experimental interest we investigate by the means of atomistic Molecular Dynamics simulation the ability of density-independent, empiric density-dependent, and recently proposed embedded-atom force fields for liquid mercury to predict the surface tension of the free surface of liquid mercury at the temperature of 293 K. The effect of the density dependence of the studied models on the liquid-vapor coexistence and surface tension is discussed in detail. In view of computational efficiency of the density-independent model we optimize its functional form to obtain higher surface tension values in order to improve agreement with experiment. The results are also corroborated by Monte Carlo simulations and semi-analytic estimations of the liquid-vapor coexistence density. *

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“…Enrichment ratio and surface or nonsurface‐active compounds recovery are often used as parameters to evaluate the efficiency of foam fractionation. The enrichment ratio is the ratio of surface or nonsurface‐active compounds concentrations in the collapsed foam to their concentrations in the initial solution:

Recovery (%) = \frac{((), C_{i} V_{i} - C_{l} V_{l})}{C_{i} V_{i}} \times 100

Enrichment ratio = \frac{C_{f}}{C_{i}}

where C i , C l , and C f are surface or nonsurface‐active compounds concentrations in the initial feed, culture broth after collection of foam fraction, and in the collapsed foam, respectively, V i is the initial liquid volume, and V l is the remaining liquid volume after foam fractionation .…”

Section: Removal Of Surface and Nonsurface Active Compounds With The mentioning

confidence: 99%

In situ downstream strategies for cost‐effective bio/surfactant recovery

Najmi

Ebrahimipour

Franzetti

et al. 2018

Biotech and App Biochem

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Since 60-80% of total costs of production are usually associated with downstream collection, separation, and purification processes, it has become advantageous to investigate how to replace traditional methods with efficient and cost-effective alternative techniques for recovery and purification of biosurfactants. In the traditional techniques, large volumes of organic solvents are usually used for increasing production cost and the overall environmental burden. In addition, traditional production and separation methods typically carried out in batch cultures reduce biosurfactant yields due to product inhibition and lower biosurfactants activity as a result of interaction with the organic solvents used. However, some in situ recovery methods that allow continuous separation of bioproducts from culture broth leading to an improvement in yield production and fermentation efficiency. For biosurfactants commercialization, enhancement of product capacity of the separation methods and the rate of product removal is critical. Recently, interest in the integration of separation methods with a production step as rapid and efficient techniques has been increasing. This review focuses on the technology gains and potentials for the most common methods used in in situ product removal: foam fractionation and ultrafiltration, especially used to recover and purify two well-known biosurfactants: glycolipids (rhamnolipids) and lipopeptides (surfactins).

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Removal of Mercury by Foam Fractionation Using Surfactin, a Biosurfactant

Cited by 39 publications

References 45 publications

Production of Biosurfactant Produced from Used Cooking Oil by Bacillus sp. HIP3 for Heavy Metals Removal

Production of Biosurfactant Produced from Used Cooking Oil by Bacillus sp. HIP3 for Heavy Metals Removal

Surface tension of liquid mercury: a comparison of density-dependent and density-independent force fields

In situ downstream strategies for cost‐effective bio/surfactant recovery

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