Electrocoagulation of synthetically prepared waters containing high concentration of NOM using iron cast electrodes

Yildiz, Yalçın Şevki; Koparal, Ali Savaş; İrdemez, Şahset; Keskinler, Bülent

doi:10.1016/j.jhazmat.2006.06.044

Cited by 93 publications

(40 citation statements)

References 22 publications

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“…In other words, introducing the sodium chloride to the water, increase the conductivity of the emulsion and decreases the fraction of the applied potential that is consumed to conquer the resistance of the emulsion and accordingly increase the fraction of the applied potential directed to the electrochemical coagulation. Yildiz et al (2007) stated that adding electrolyte to the water will increase the delivery of coagulant ions to the medium. However, it must be taken into consideration that increasing the electrolyte concentration implies high concentration in chloride ions in the emulsion.…”

Section: Effect Of Current Density On Oil Separation Efficiencymentioning

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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Section: Effect Of Current Density On Oil Separation Efficiencymentioning

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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“…The increased conductivity can facilitate the passage of current. Yildiz et al 40 reported that the addition of Na 2 SO 4 resulted in the delivery of more iron to the medium. The present study showed that the addition of NaNO 3 is beneficial to the pretreatment by electrocoagulation.…”

Section: Effect Of Supporting Electrolytementioning

confidence: 99%

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Phalakornkule¹,

Mangmeemak²,

Intrachod³

et al. 2010

ScienceAsia

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Palm oil mill effluent (POME) is wastewater generated from the palm oil milling process. It is regarded as a highly polluting wastewater as it has a high chemical oxygen demand (COD), and contains high levels of oil and suspended solids. Pretreatment of POME is desirable before a subsequent biological or other treatment. This paper reports a study of POME pretreatment by (1) electrocoagulation and (2) conventional coagulation with Al 2 (SO 4 ) 3 . At an optimal condition with a current density of 20 A/m 2 for 5 min at 313 K and pH 5, the percentage of oil, COD, suspended solids, and total solids removal by electrocoagulation were 72%, 64%, 53%, and 43%, respectively. The electrical consumption under this condition was in the order of 0.10 kWh/m 3 . The addition of NaNO3 improved the electrocoagulation, and it may also be beneficial for a subsequent biological treatment. At high current densities and/or long electrocoagulation time, POME treatment produced bubbles, which decrease the efficiency of oil removal. This effect did not occur in conventional coagulation. However, chemical coagulation limits oil removal from POME due to the effect of pH. Overall, electrocoagulation should cause less environmental damage than conventional chemical coagulation by Al 2 (SO 4 ) 3 as it treats POME without the need to add sulphate ions.

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“…The complete generation of iron (hydr)oxides by an iron anode in electrocoagulation is often summarized by the following two mechanisms (Mollah et al, 2004;Daneshvar et al, 2007;Yildiz et al, 2007;Endyuskin et al, 1983):…”

Section: Electrocoagulation (Ec) Using Ironmentioning

confidence: 99%

Electrochemical arsenic remediation for rural Bangladesh

Addy¹

2008

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Professor Ashok Gadgil, Co-Chair Professor Robert Jacobsen, Co-Chair Arsenic in drinking water is a major public health problem threatening the lives of over 140 million people worldwide. In Bangladesh alone, up to 57 million people drink arsenic-laden water from shallow wells. ElectroChemical Arsenic Remediation (ECAR) overcomes many of the obstacles that plague current technologies and can be used affordably and on a small-scale, allowing for rapid dissemination into Bangladesh to address this arsenic crisis.In this work, ECAR was shown to effectively reduce 550 -580 µg/L arsenic (including both As [III] and As[V] in a 1:1 ratio) to below the WHO recommended maximum limit of 10 µg/L in synthetic Bangladesh groundwater containing relevant concentrations of competitive ions such as phosphate, silicate, and bicarbonate. Arsenic removal capacity was found to be approximately constant within certain ranges of current density, but was found to change substantially between ranges. In order of decreasing arsenic 2 removal capacity, the pattern was: 0.02 mA/cm 2 > 0.07 mA/cm 2 > 0.30 -1.1 mA/cm 2 > 5.0 -100 mA/cm 2 . Current processing time was found to effect arsenic removal capacity independent of either charge density or current density. Electrode polarization studies showed no passivation of the electrode in the tested range (up to current density 10 mA/cm 2 ) and ruled out oxygen evolution as the cause of decreasing removal capacity with current density. Simple settling and decantation required approximately 3 days to achieve arsenic removal comparable to filtration with a 0.1 µm membrane.X-ray Absorption Spectroscopy (XAS) showed that (1) there is no significant difference in the arsenic removal mechanism of ECAR during operation at different current densities and (2) the arsenic removal mechanism in ECAR is consistent with arsenate adsorption onto a homogenous Fe(III)oxyhydroxide similar in structure to 2-line ferrihydrite.ECAR effectively reduced high arsenic concentrations (100 -500 µg/L) in real Bangladesh tube well water collected from three regions to below the WHO limit of 10 µg/L. Prototype fabrication and field testing are currently underway.

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Electrocoagulation of synthetically prepared waters containing high concentration of NOM using iron cast electrodes

Cited by 93 publications

References 22 publications

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

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

Untitled

Electrochemical arsenic remediation for rural Bangladesh

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