A simple model to predict the removal of oil suspensions from water using the electrocoagulation technique

Carmona, Manuel; Khemis, Mohamed; Leclerc, Jean-Pierre; Lapicque, François

doi:10.1016/j.ces.2005.08.030

Cited by 124 publications

(54 citation statements)

References 34 publications

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“…The concentration of oil in effluents from different industrial sources is found to vary widely, from several to as high as 40 g/L. [1] For removal of oil droplets from aqueous environments, several techniques have been attempted by many investigators, such as filtration, [2 -5] chemical destabilization, [6] dissolved air flotation, [7 -11] electrocoagulation [12,13] flotation and so on. Other applications for wastewater treatment including o/w emulsion have also been examined by many investigators and are to be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of oil droplet removal from o/w emulsion by adding methylated milk casein in flotation technique

Maruyama

Tada

Seki

2009

Asia-Pacific J Chem Eng

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To clarify oil-in-water (o/w) emulsion, flotation experiments were conducted by adding methylated milk casein (MeCS), which is a biodegradable flocculant. Emulsion used in this study was prepared by ultrasonic emulsification of heavy oil (bunker-A) and sodium dodecyl sulfate (SDS) solution. It was found that addition of MeCS enhanced clarification of oil droplets from o/w emulsion solution due to floc formation by adding MeCS. An optimum dosage of MeCS to form effective floc was determined by the relative turbidity in a clarification experiment. In flotation experiments, clarification ability was evaluated by removal rate constant, k , obtained by fitting of turbidity data to a pseudo-first-order kinetic equation. In case of varying dosage of MeCS and keeping superficial gas velocity, U g , at constant value (5.48 × 10 −2 cm/s), removal rate was greatly influenced by amount of MeCS dosage. The maximum value of k was also obtained at the most optimum dosage of MeCS, and k decreased with adding lesser or larger amount of MeCS than the optimum dosage. On the other hand, in case of keeping the dosage of MeCS at the optimum dosage, and varying superficial gas velocity, up to U g < ca. 0.2 cm/s, k was increased with increasing superficial gas velocity, and increase in removal rate of oil droplets was mostly proportional with increase in bubble surface area production rate. 

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Section: Introductionmentioning

confidence: 99%

Enhancement of oil droplet removal from o/w emulsion by adding methylated milk casein in flotation technique

Maruyama

Tada

Seki

2009

Asia-Pacific J Chem Eng

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“…Electrocoagulation was reported to be e cient to treat water containing oilin-water emulsion [24,25,26]. As the water used during re extinguishment may contain such emulsions, an experiment was done with PFW3.…”

Section: Aluminium Concentration During Electrocoagulationmentioning

confidence: 99%

Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Baudequin

Couallier

Rakib

et al. 2011

Separation and Purification Technology

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Extinguishments of large scale solvent res produce large amounts of water that may contain various uorinated surfactants depending on the type of re ghting foam used. Due to their chemical nature, uorinated parts of uorinated compounds are highly resistant to biochemical and advanced oxidation processes. Therefore the current treatment for the degradation of uorinated surfactant from water used in re extinguishment is high temperature incineration of the water in halogen resistant incinerators. This paper aims to propose a process for purifying re ghting water containing uorinated surfactants.Pilot re ghting waters resulting from heptane re extinguishment with reghting foam containing a uorinated surfactant were produced. Suspended matter was estimated on the basis of turbidity measurement and uorinated not suitable for direct membrane processes because of high fouling, hence electrocoagulation and ltration were required. Electrocoagulation with aluminium electrodes at a charge loading of 600 C L −1 followed by ltration were found su cient to remove turbidity from pilot re ghting waters. Fluorinated surfactant removal was 71 77% and was not signi cantly increased by higher charge loading. Floc separation in bulk solution was achieved by ltration. Reverse osmosis of pretreated pilot re ghting water and concentrated model solutions of pretreated re ghting water were studied and though ux decline was observed, measured retention rates were 99.94 99.97%, with permeate concentrations down to 10 16 µg L −1 of uorinated surfactant at the laboratory scale. The concentrate from reverse osmosis could be recycled in electrocoagulation-ltration. Experimental results indicated that electrocoagulation and ltration followed by reverse osmosis e ciently treated the water from re extinguishment, which enables a further scale-up work.

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“…Because wastewater including o/w emulsion has influences on aqueous environments, for removal of oil droplets from aqueous environments, several techniques have been proposed, such as filtration (Belkacem et al, 1999;Hilal et al, 2004;Lobo et al, 2006;Hu et al, 2007), chemical destabilization (Rios et al, 1998), dissolved air flotation (Abo-El Ela et al, 1980;Fukushi et al, 1998;Zouboulis et al, 2000;Al-Shamrani et al, 2002a;Al-Shamrani et al, 2002b), electrocoagulation (Carmona et al, 2006;Cañizares et al, 2008), flotation (Maruyama et al, 2009) and so on.…”

Section: Introductionmentioning

confidence: 99%

Removal kinetic model of oil droplet from o/w emulsion by adding methylated milk casein in flotation

2012

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In this study, o/w emulsion flotation experiments were conducted by with adding methylated milk casein (MeSC). Emulsion used in this study was prepared by ultrasonic emulsification of heavy oil (bunker-A) and sodium dodecyl sulfate (SDS) solution. A simple kinetic model was proposed to estimate the removal rate of the oil droplets within the column. The model was based on main assumption that adsorption of single droplet adsorbed MeCS or floc onto bubble surface within flotation column. Removal rate constant, K, was defined by k a X s (S b  /V), where k a and X s are overall adsorption rate and saturated adsorption density of oil droplet or floc, S b ,  and V are bubble surface production rate, retention time of bubble swarms and emulsion volume within the column, respectively. The experiments were conducted with varying operating conditions; superficial gas velocity, column dimension and emulsion volume. K was evaluated from slope value of obtained straight line by plotting time versus ln(T/T 0 ), where T/T 0 is relative turbidity. K was mostly proportional to (S b  /V), which corresponds to specific surface area of bubble swarms per unit volume within the column, in the present experimental region. This result suggested that efficiency of this removal process was mainly controlled by the specific surface area of bubble swarms, and proposed model was fundamentally verified.

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A simple model to predict the removal of oil suspensions from water using the electrocoagulation technique

Cited by 124 publications

References 34 publications

Enhancement of oil droplet removal from o/w emulsion by adding methylated milk casein in flotation technique

Enhancement of oil droplet removal from o/w emulsion by adding methylated milk casein in flotation technique

Purification of firefighting water containing a fluorinated surfactant by reverse osmosis coupled to electrocoagulation–filtration

Removal kinetic model of oil droplet from o/w emulsion by adding methylated milk casein in flotation

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