Effect of electrical potential on the electro-demulsification of oily sludge

Elektorowicz, Maria; Habibi, Shiva; Chifrina, R.

doi:10.1016/j.jcis.2005.08.042

Cited by 81 publications

(54 citation statements)

References 12 publications

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“…Oily sludge waste is also a sophisticated W/O emulsion produced during crude oil conveyance, storage, and refining process, containing 30-50 wt.% oil, 30-50 wt.% water, and 10-12 wt.% solid content, which is mainly stabilized by fine solids adsorbed at the droplet surface and hamper the drops coalescence, and is deemed hazardous to surroundings as well as human health because of its high concentration of petroleum hydrocarbons, which thus makes it essential to undergo the oil recovery process prior to the sludge disposal [2,17,18].…”

Section: Water-in-oil (W/o) Emulsionsmentioning

confidence: 99%

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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

555

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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Section: Water-in-oil (W/o) Emulsionsmentioning

confidence: 99%

“…In general, a three-step coalescence mechanism is introduced: approaching of dispersed droplets, interfacial film thinning, and ultimately film breakup leading to coalescence of droplets [18,217]. The overall governing step is often the film thinning process which is appreciably improved applying an effectual electric field [8].…”

Section: Mechanismmentioning

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

555

255

View full text Add to dashboard Cite

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“…During the electrolysis, ferrous ions produced by anodic dissolution reacted vigorously with the emulsified hydrocarbons, leading to phase inversion and breaking of the emulsion. Stabilized drops of hydrocarbon were then readily sorbed and adhered to the surface of the metallic hydroxides particles [22]. Likewise, hydrogen gas bubbles (H 2 ) evolved at the cathode electrodes floated the hydroxide flocs together with the hydrocarbons adsorbed on the surface of hydroxides.…”

Section: Efficiency and Reproducibility Of The Obw Treatment By Combimentioning

confidence: 99%

Organics removal in oily bilgewater by electrocoagulation process

Asselin

Drogui

Brar

et al. 2008

Journal of Hazardous Materials

138

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“…Secondly, following this process, the electro-coagulation of the separated solid phase could occur near the anode area, leading to increased solid phase and sediments concentration. Lastly, the separated liquid phase (water and oil, without colloid particles and fine solids) can produce an unstable secondary oil-in-water emulsion which could be gradually electro-coalesced near the cathode area through charging and agglomeration of droplets, thus forming two separated phases of water and oil (Elektorowicz et al, 2006).…”

Section: Electrokinetic Methodsmentioning

confidence: 99%

“…However, most of the electrokinetic studies on oily sludge have been conducted at the laboratory level, and the performance and costs at a large scale still need further investigation. It is expected that using oily sludge storage pools as the electrokinetic cell at the field scale could considerably reduce the treatment cost (Elektorowicz et al, 2006).…”

Section: Electrokinetic Methodsmentioning

confidence: 99%

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

Hu¹

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Oily sludge is one of the most significant wastes generated in the petroleum industry.It is a complex emulsion of various petroleum hydrocarbons (PHCs), water, metals, and fine solids. Due to its hazardous nature and increased generation quantities around the world, the effective treatment of oily sludge has attracted widespread attention. The complexity of its composition and diversity of its origin sources make oily sludge management a difficult and costly undertaking. Many methods have been developed for the treatment of oily sludge through oil recovery or sludge disposal approaches, but no single specific process can be considered as a panacea since each method is associated with different advantages and limitations. Efforts should focus on the improvement of current technologies and the combination of oil recovery with sludge disposal in order to comply with both resource reuse recommendations and environmental regulations. The object of this study was to develop novel combined methods for oil recovery treatment on different refinery oily sludges. The investigation focused on the oil recovery performance of combined methods based on four individual treatment processes including ultrasonic irradiation, solvent extraction, freeze/thaw, and pyrolysis in oily sludge treatment.Firstly, the oil recovery and salt removal effects of ultrasonic irradiation on oil refinery tank bottom sludge were investigated, together with those of direct heating.Ultrasonic power, treatment duration, sludge-to-water ratio, and initial sludge-water slurry temperature were examined for their impacts on sludge treatment. It was found that the increased initial slurry temperature could enhance the ultrasonic irradiation performance, especially at lower ultrasonic power level (i.e., 21 W), but the application of higher-power ultrasonic irradiation could rapidly increase the bulk temperature of slurry. Ultrasonic 2 irradiation had a better oil recovery and salt removal performance than direct heating treatment. More than 60% of PH Cs in the sludge was recovered at an ultrasonic power of 75 W, a treatment duration of 6 min, an initial slurry temperature of 25 °C, and a sludgeto-water ratio of 1 :4, while salt content in the recovered oil was reduced to <5 mg/L, thereby satisfying the salt requirement in refinery feedstock oil. In general, ultrasonic irradiation could be an effective method in terms of oil recovery and salt removal from refinery oily sludge, but the separated wastewater still contains relatively high concentrations of PH Cs and salt which requires proper treatment.Two types of ultrasonic assisted extraction (UAE) treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated for oil recovery from refinery oily sludge. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil an...

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Effect of electrical potential on the electro-demulsification of oily sludge

Cited by 81 publications

References 12 publications

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

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

Organics removal in oily bilgewater by electrocoagulation process

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

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