Bench scale electrocoagulation studies of bio oil-in-water and synthetic oil-in-water emulsions

Karhu, M.; Kuokkanen, Ville; Kuokkanen, Toivo; Rämö, Jaakko

doi:10.1016/j.seppur.2012.06.003

Cited by 69 publications

(27 citation statements)

References 32 publications

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“…Effects of pH, electrode material, current density and treatment time are investigated, and the removal efficiency of 95.1 % for total hydrocarbon was achieved in optimized conditions (pH of neutral, electrode arrangement of steel-aluminum as anode-cathode and current density of 18 mA/cm 2 ). Karhu et al (2012) studied bench-scale treatment of 0.6 and 2 % bio oil-in-water and synthetic oil-in-water emulsions. No significant difference was detected in using stainless steel or aluminum electrodes.…”

Section: Electrocoagulationmentioning

confidence: 99%

Electrocoagulation for COD and diesel removal from oily wastewater

Safari

Aghdam

Kariminia

2015

Int. J. Environ. Sci. Technol.

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This study investigated the diesel and COD removal from oily wastewater by electrocoagulation. Experiments were conducted in a 2-l reactor using aluminum and iron electrodes. Effects of different parameters including pH (3-11), time (10-60 min), voltage (4.5-10.5 V), supporting electrolyte (NaCl concentration), electrode material and initial diesel concentration (3500-11,000 mg/L) were studied in order to evaluate the efficiency of electrocoagulation. Furthermore, the consumption of energy and the amount of sludge produced by this method were evaluated. The highest removal efficiency (COD removal of 99.1 ± 0.2 % and diesel removal of 98.8 ± 0.2 %) was observed under the following conditions: pH 7, 40 min, 10.5 V, NaCl concentration of 0.5 g/ L, diesel concentration of 3500 mg/L. The consumption of energy was estimated to be 6.47 kWh/m 3 , and the amount of sludge generated was 1995 mg/L. The results demonstrated that the electrocoagulation is a feasible technique for treatment of heavily contaminated petroleum refinery wastewater.

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Section: Electrocoagulationmentioning

confidence: 99%

Electrocoagulation for COD and diesel removal from oily wastewater

Safari

Aghdam

Kariminia

2015

Int. J. Environ. Sci. Technol.

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“…However, conventional wastewater treatment methods remain unsatisfactory (Zhou et al, 2008). Conventional coagulation which is widely used technique has many drawbacks including the requirement of high amount of coagulant, long operation time, high treatment cost, large area of construction, corrosion problems due to the decrease in pH and problems with produced sludge (Martinez-Delgadillo et al, 2010;Karhu et al, 2012). Biological processes are generally less expensive than the chemical equivalents.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Electrocoagulation Treatment Technique for the Separation of Oil from Wastewater

Fadali¹,

Ebrahiem²,

Gamil³

et al. 2015

J. of Environmental Science and Technology

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Oily wastewater represents a dangerous threat when discharged to receiving bodies. This research investigates electrocoagulation as a simple, effective and economic technique for treatment of such wastewater. Bench scale reactors were used to evaluate the factors that may affect the treatment of a wastewater obtained from Kuwait Gulf Oil Company. Aluminum was used as a sacrificial anode. Electrodes were arranged at different configurations (horizontal, vertical and vertical anode with horizontal cathode) to select the optimal one. Other tested operation parameters include time of treatment, current density, the distance between the electrodes, anode tubes diameters and the electrolyte concentration of the emulsion. The treatment efficiency was evaluated by comparing the initial and final turbidity of the treated wastewater. Experimental results indicate that the efficiency of oil separation increased with the increase of the treatment time, current density, anode diameter and concentration of electrolyte. However, it decreased with the increase of distance between electrodes. The horizontal arrangement gave the best results. The data shows that oil separation increases slightly with increasing temperature. The optimum time and current density for oil separation was determined as 30 min and 30 mA cmG 2 , respectively. These parameters reduced the turbidity of the wastewater from 95-5 NTU.

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“…Several researchers, as Un et al (2009), Canizares et al (2007, Yang (2007), Bensadok et al (2008), Cerqueira et al (2014), and Karhu et al (2012), have reported high efficiency in removing chemical oxygen demand (COD), oil and grease (O&G), color, and turbidity, indicating that it is a promising alternative in treatment of oily emulsion for oil industry such as oilfield-produced water.…”

Section: Introductionmentioning

confidence: 99%

Effects of untreated and treated oilfield-produced water on seed germination, seedling development, and biomass production of sunflower (Helianthus annuus L.)

Marques

Souza

Rigo

et al. 2015

Environ Sci Pollut Res

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This study aims to evaluate possible toxic effects of oil and other contaminants from oilfield-produced water from oil exploration and production, on seed germination, and seedling development of sunflower (Helianthus annuus L.). In comparison, as treated by electroflocculation, oilfield-produced water, with lower oil and organic matter content, was also used. Electroflocculation treatment of oilfield-produced water achieved significant removals of chemical oxygen demand (COD) (94 %), oil and grease (O&G) (96 %), color (97 %), and turbidity (99 %). Different O&G, COD, and salt levels of untreated and treated oilfield-produced water did not influence germination process and seedling biomass production. Normal seedlings percentage and vigor tended to decrease more intensely in O&G and COD levels, higher than 337.5 mg L(-1) and 1321 mg O2 L(-1), respectively, using untreated oilfield-produced water. These results indicate that this industrial effluent must be treated, in order to not affect adversely seedling development. This way, electroflocculation treatment appears as an interesting alternative to removing oil and soluble organic matter in excess from oilfield-produced water improving sunflower's seedling development and providing a friendly environmental destination for this wastewater, reducing its potential to harm water resources, soil, and biota.

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Bench scale electrocoagulation studies of bio oil-in-water and synthetic oil-in-water emulsions

Cited by 69 publications

References 32 publications

Electrocoagulation for COD and diesel removal from oily wastewater

Electrocoagulation for COD and diesel removal from oily wastewater

Investigation of the Electrocoagulation Treatment Technique for the Separation of Oil from Wastewater

Effects of untreated and treated oilfield-produced water on seed germination, seedling development, and biomass production of sunflower (Helianthus annuus L.)

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