Effects of operational parameters on cadmium removal from aqueous solutions by electrochemical coagulation

Bayar, Serkan; Yılmaz, Alper Erdem; Boncukçuoğlu, Recep; Fìl, Baybars Ali; Kocakerìm, M. Muhtar

doi:10.1080/19443994.2012.749201

Cited by 33 publications

(16 citation statements)

References 36 publications

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“…However, adjusting the initial pH to 3 decreased COD about 25 % from 7150 to 5256. This was also demonstrated in other research (Aoudj et al 2010;Bayar et al 2013) that reported that the treatment efficiency was very poor either at low or high pH. The optimal value is revealed to be pH 6.…”

Section: Effect Of Initial Phsupporting

confidence: 78%

“…An increase in the time of electrolysis from 10 to 60 min yields an increase in the dye removal efficiency from 52.5 to 98.28 %. Also, Bayar et al (2013) found that the best removal efficiency was obtained under the conditions of 180-min electrolysis time, wastewater with constant pH of 6. There was no remarkable result at pH 3 or levels higher than 7.…”

Section: Effect Of Treatment Timementioning

confidence: 95%

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Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw

Rastegarfar

Behrooz

Bahramifar

2015

Environ Monit Assess

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The effect of electrocoagulation treatment was investigated on black liquor from soda-anthraquinone (AQ) pulping of wheat straw. Removal of phenol, chemical oxygen demand (COD), color, total suspended solids (TSS), total dissolved solids (TDS), and total solids (TS) from black liquor was investigated at different current densities by using aluminum electrodes at various electrolysis times (10, 25, 40, 55, and 70 min) and pH levels (3, 5, 7, 9, and 10.5). It was observed that at 16 V, electrolysis time of 55 min and current density of 61.8 mA/cm(2) were sufficient for the removal of the pollutants. Energy consumption was evaluated as an important cost-relation parameter. Results showed that the electrocoagulation treatment reduced color intensity from the high initial value of 18,750 to 220 PCU. This was strongly influenced by the pH level of the wastewater. In addition, it was found that the removal efficiency increased with increasing of current density. The maximum efficiencies for removal were 98.8, 81, 80, 92, 61, and 68 % for color, phenol, COD, TSS, TDS, and TS, respectively. The lowest energy consumption values were obtained at neutral pH after 55 min. Electrocoagulation was found to be an effective, simple, and low-cost technique to treat black liquor.

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Section: Effect Of Initial Phsupporting

confidence: 78%

Section: Effect Of Treatment Timementioning

confidence: 95%

Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw

Rastegarfar

Behrooz

Bahramifar

2015

Environ Monit Assess

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“…Water is used in daily activities, which in turn increases the need for efficient wastewater treatment facilities. Due to rapid industrialization, a large quantity of polluted water is generated every year by different industries such as textile (Zheng et al 2012), leather (Natarajan et al 2013), pharmaceutical (Farhadi et al 2012;Boroski et al 2009), heavy metal (Al Aji et al 2012), cadmium removal (Bayar et al 2013;Yilmaz et al 2012), arsenic (Can et al 2012(Can et al , 2014, dairy processing (Idris et al 2012), paint (Singh et al 2015), petroleum (Zhou et al 2012), pulp and paper (Bengtsson et al 2008;Pokhrel and Viraraghavan 2004), distillery (Lucas et al 2009), fertilizer (Srivastava et al 1996), tannery (Houshyar et al 2012), landfill (Wu et al 2011), bakers yeast (Gengec et al 2012), food processing (Pocostales et al 2012), biodiesel (Ngamlerdpokin et al 2011) and olive packaging industries (García-García et al 2011;Kul et al 2015), Pistachio processing industry Fil et al 2014), etc. The pulp and paper industry is a large consumer of fresh water and an important source of wastewater (Ashrafi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Sono assisted electrocoagulation process for the removal of pollutant from pulp and paper industry effluent

Asaithambi

Aziz

Sajjadi

et al. 2016

Environ Sci Pollut Res

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In the present work, the efficiency of the sonication, electrocoagulation, and sono-electrocoagulation process for removal of pollutants from the industrial effluent of the pulp and paper industry was compared. The experimental results showed that the sono-electrocoagulation process yielded higher pollutant removal percentage compared to the sonication and electrocoagulation process alone. The effect of the operating parameters in the sono-electrocoagulation process such as electrolyte concentration (1-5 g/L), current density (1-5 A/dm), effluent pH (3-11), COD concentration (1500-6000 mg/L), inter-electrode distance (1-3 cm), and electrode combination (Fe and Al) on the color removal, COD removal, and power consumption were studied. The maximum color and COD removal percentages of 100 and 95 %, respectively, were obtained at the current density of 4 A/dm, electrolyte concentration of 4 g/L, effluent pH of 7, COD concentration of 3000 mg/L, electrode combination of Fe/Fe, inter-electrode distance of 1 cm, and reaction time of 4 h, respectively. The color and COD removal percentages were analyzed by using an UV/Vis spectrophotometer and closed reflux method. The results showed that the sono-electrocoagulation process could be used as an efficient and environmental friendly technique for complete pollutant removal.

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“…Conventional treatment technologies for heavy metals mainly include chemical precipitation [8], ionexchange [9], adsorption [10], membrane [11], flotation [12], coagulation-flocculation [13], and electrochemical methods [14]. Among these, adsorption process is featured by its easy setup, simple operation, low maintenance cost, and many types of readily accessible costeffective adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale iron oxides loaded granular activated carbon (GAC-NSIO) for cadmium removal

Zhang

Chen

et al. 2016

Desalination and Water Treatment

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A new hybrid material was prepared by loading the nanoscale iron oxide particles within the pores of granular activated carbon (GAC-NSIO) and used as adsorbent to remove Cd(II) in aqueous phase. The new material is characterized by the pH pzc , TEM, XRD, BET, and XPS analytical techniques to deduce the potential adsorptive mechanism, and further it along with GAC were assessed in the removal of Cd(II) from aqueous solution for various physico-chemical factors iron-loaded content, pH, humic acid, isotherm, kinetics, and thermodynamics, under the batch reactor studies and rapid small-scale column tests also appended dealing with the breakthrough volume. Characterization of adsorbent indicated that the amorphous nanoscale iron oxides were successfully immobilized on GAC. Adsorption mechanism mainly included surface complexation, Donnan membrane effect, and electrostatic attraction. The optimum iron-loaded content of GAC-NSIO was 17%. The adsorption process was more favorable at high pH, and iron oxide was almost no leaching (<0.25%) in the pH range of 3-6. Adsorption isotherm fitted well with Langmuir and Freundlich models. And adsorption kinetics fitted well with pseudo-second-order and intraparticle diffusion models. Results indicated that loaded nanoscale iron oxides significantly increased adsorption capacity of Cd(II) though the adsorption rate declined slightly and the adsorption process was endothermic. The maximum adsorptive capacity of GAC-NSIO (7.84 mg/g) increased by 700%, compared to that of GAC (0.98 mg/g). The presence of humic acid could greatly impact Cd(II) adsorption which promoted adsorption at low concentrations (1-10 mg/L) and inhibited adsorption at high concentrations (10-300 mg/L). Rapid small-scale column tests were conducted to obtain Cd(II) breakthrough profile. The results corresponded well with those from batch tests. Results demonstrate that the GAC-NSIO is a promising adsorbent for the removal of Cd(II) in contaminated water environment.

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Effects of operational parameters on cadmium removal from aqueous solutions by electrochemical coagulation

Cited by 33 publications

References 36 publications

Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw

Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw

Sono assisted electrocoagulation process for the removal of pollutant from pulp and paper industry effluent

Nanoscale iron oxides loaded granular activated carbon (GAC-NSIO) for cadmium removal

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