Efficient breaking of water/oil emulsions by a newly isolated de-emulsifying bacterium, Ochrobactrum anthropi strain RIPI5-1

Mohebali, Ghasemali; Kaytash, Ashk; Etemadi, Narges

doi:10.1016/j.colsurfb.2012.04.037

Cited by 34 publications

(26 citation statements)

References 24 publications

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“…De-emulsifying activity Mohebali et al (2012) yeast Saccharomyces cerevisiae exhibited emulsion with the vegetable oils tested and showed emulsion activity of 65 % towards palm oil as oil-in-water with a critical emulsifier concentration of 20 g/l with similar emulsifying properties to the commonly used food emulsifiers gum arabic and lecithin (Dikit et al 2010). The emulsion was stable over a wide range of pH, temperature and salinity showing a great potential for application in salad dressing.…”

Section: Emulsification Capacitymentioning

confidence: 96%

“…In fact, whole bacterial cells of B. subtilis (Janiyani et al 1994), Nocardia amarae , Micrococcus sp. (Das, 2001) and Ochrobactrum anthropi were reported as de-emulsifying agents (Mohebali et al 2012). Along with different experiments, mixed culture products were shown to exhibit high de-emulsifying activity as compared to the most effective pure culture of A. calcoaceticus (Nadarajah et al 2002).…”

Section: De-emulsification Capacitymentioning

confidence: 97%

“…and Alcaligenes latus showed high de-emulsification activity with 96 % deemulsification of a water-in-oil emulsion within 24 h. Mohebali et al (2012) isolated a new de-emulsifying bacterium, O. anthropi strain RIPI5-1. The potential activity of this strain was also explained using a complex oil field emulsion and suggested a biodemulsification capacity of about 63 and 72 % when using the whole culture and whole cells of the bacteria, respectively (Mohebali et al 2012). Also, the finding of Park et al (2000) reported that aerial spores of Streptomyces sp.…”

Section: De-emulsification Capacitymentioning

confidence: 98%

“…Problems associated with the presence of water in oil include corrosion, scale formation and sludge accumulation in storage tanks. These altered the viscosity of oil and the flow properties and reduced distillation efficiency (Mohebali et al 2012). Before being transported and refined, crude oil emulsions should be demulsified to reduce water content and recover crude oil (de Souza Sobrinho et al 2013).…”

Section: De-emulsification Capacitymentioning

confidence: 99%

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High molecular weight bioemulsifiers, main properties and potential environmental and biomedical applications

Mnif

Ghribi

2015

World J Microbiol Biotechnol

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High molecular weight bioemulsifiers are amphipathic polysaccharides, proteins, lipopolysaccharides, lipoproteins, or complex mixtures of these biopolymers, produced by a wide variety of microorganisms. They are characterized by highly structural diversity and have the ability to decrease the surface and interfacial tension at the surface and interface respectively and/or emulsify hydrophobic compounds. Emulsan, fatty acids, phospholipids, neutral lipids, exopolysaccharides, vesicles and fimbriae are among the most popular high molecular weight bioemulsifiers. They have great physic-chemical properties like tolerance to extreme conditions of pH, temperature and salinity, low toxicity and biodegradability. Owing their emulsion forming and breaking capacities, solubilization, mobilization and dispersion activities and their viscosity reduction activity; they possess great environmental application as enhancer of hydrocarbon biodegradation and for microbial enhanced oil recovery. Besides, they are applied in biomedical fields for their antimicrobial and anti-adhesive activities and involvement in immune responses.

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Section: Emulsification Capacitymentioning

confidence: 96%

Section: De-emulsification Capacitymentioning

confidence: 97%

Section: De-emulsification Capacitymentioning

confidence: 98%

Section: De-emulsification Capacitymentioning

confidence: 99%

See 2 more Smart Citations

High molecular weight bioemulsifiers, main properties and potential environmental and biomedical applications

Mnif

Ghribi

2015

World J Microbiol Biotechnol

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“…Apart from the above-mentioned parameters, agitation speed of demulsifier in emulsion, residence time for phase separation and settling, phase volume ratio (sample volume:emulsion volume), and reaction mixture volume are among the major factors affecting the emulsion breaking efficiency [147,181].…”

Section: Culture Agementioning

confidence: 99%

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Zolfaghari

Fakhru’l‐Razi

Abdullah

et al. 2016

Separation and Purification Technology

554

255

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The difficulties associated with transportation and refining of crude oil emulsions as well as produced water discharge limitations are among the conspicuous clues that have led the oilfield researchers to probe into practical demulsification methods for many decades.Inconsistent research outcomes observed in the literature for a particular demulsification method of a typical emulsion (i.e., water-in-oil or oil-in-water) arise not only from the varied influential parameters associated (such as salinity, temperature, pH, dispersed phase content, emulsifier/demulsifier concentration, droplet size, etc.), but also from the diverse types of emulsion constituents (namely oil, surfactant, salt, alkali, polymer, fine solids, and/or other chemicals/impurities). Being the main component in formation of stabilizing interfacial film surrounding the dispersed phase droplets, surfactant is the most predominant contributor to emulsion stability, extent of which depends on its nature (being ionic or nonionic, and its degree of hydrophilicity/lipophilicity), concentration and interaction with other surface-active agents in the emulsion, as well as on the salinity, temperature, and pH of the system. In this paper, it is endeavored to overview some of the most commonly exploited demulsification techniques (i.e., chemical, biological, membrane, electrical, and microwave irradiation) on both the oilfield and synthetic emulsions, taking into account the emulsion-stabilizing anddestabilizing effects with regard to the dominant parameters plus the emulsion composition.Further, the variations occurring in interfacial properties of emulsions by demulsification process are discussed. Finally, the mechanism(s) involved in emulsions resolution achieved by each method is elucidated. Clearly, the most efficient demulsification approach is the one able to attain desirable separation efficiency while complying with the environmental regulations and imposing the least economic burden on the petroleum industry.

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Using microalgae for remediation of crude petroleum oil–water emulsions

Kuttiyathil

Mohamed

Al‐Zuhair

2020

Biotechnology Progress

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Crude petroleum oil spills are among the most important organic contaminations.While the separated oils accumulated on the surface water are relatively easily removed, the emulsified portions are more difficult to remove and pose significant threats to the environment. Bioremediation using bacteria has proven to be an effective method, but the biomass produced in this case does not have any significant remunerative value. In this work, microalgae were proposed to combine emulsified oil remediation process with the potential of microalgae as a biofuel feedstock, thus enhancing the economic and environmental benefits of the process. A freshwater strain of Chlorella vulgaris was grown in water containing different concentrations of emulsified crude oil at different temperatures. The specific growth rate (μ max ) of the microalgae for each initial oil concentration was determined and was found to increase with the increase in initial oil concentration. For example, at 30 C, the specific growth rate, μ increased from 0.477 to 0.784 per day as the oil concentration increased from 57 to 222 mg/L. At 30 C, the effect of substrate concentration agreed with that of the microalgae growth, whereas at 40 C, the drop in oil concentration decreased with the increase in concentration. The results were fitted to a modified Monod kinetics model that used specific interfacial area as the influential substrate instead of the actual concentration. The results of this study clearly show the potential of using microalgae for emulsified oil remediation at relatively high concentrations.

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Efficient breaking of water/oil emulsions by a newly isolated de-emulsifying bacterium, Ochrobactrum anthropi strain RIPI5-1

Cited by 34 publications

References 24 publications

High molecular weight bioemulsifiers, main properties and potential environmental and biomedical applications

High molecular weight bioemulsifiers, main properties and potential environmental and biomedical applications

Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry

Using microalgae for remediation of crude petroleum oil–water emulsions

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