Fluoride Removal from pretreated Photovoltaic Wastewater by Electrocoagulation: An Investigation of The Effect of Operational Parameters

Drouiche, Nadjib; Aoudj, S.; Lounici, H.; Drouiche, M.; Ouslimane, Tarik; Ghaffour, Noreddine

doi:10.1016/j.proeng.2012.01.1218

Cited by 72 publications

(30 citation statements)

References 33 publications

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“…It is employed for wafer etching and quartz cleaning operations [1]. The generated acid fluoride-containing wastewaters are characterized by low pH and fluoride concentrations more than 1,000 mg/L [1,2]. The direct discharge of such solutions may represent a huge threat for the environment.…”

Section: Introductionmentioning

confidence: 99%

Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation

Aoudj

Khelifa

Drouiche

et al. 2015

Desalination and Water Treatment

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A B S T R A C TReduction of toxic dissolved fluoride and CaF 2 nanoparticle pollution is a critical environmental problem for the semiconductor industry. In this study, suspended matter and fluoride are simultaneously eliminated by combining coagulation and electroflotation. The EF cell was equipped with DSA titanium coated with ruthenium oxide (Ti/RuO 2 ) as anode and stainless steel as cathode. High turbidity removal efficiency is achieved by using EF as a separation technique. The effect of the following parameters: electrolysis time, coagulant concentration, initial pH, nature of neutralizing salt and current intensity was studied. Removal efficiencies of both fluoride and CaF 2 nanoparticles are satisfactory. Under optimum conditions, the solid-liquid separation efficiency is about 97% in terms of turbidity removal which corresponds to a residual turbidity of 4.4 NTU complying with the standard limit (5 NTU), while fluoride efficiency removal may reach 73% corresponding to 10 mg/L, which is below the environmental recommendations.

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Section: Introductionmentioning

confidence: 99%

Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation

Aoudj

Khelifa

Drouiche

et al. 2015

Desalination and Water Treatment

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“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13] www.deswater.com doi: 10.1080/19443994.2015.1007487 for the human body is usually from the drinking water which covers about 75-90% of the daily intake [8]. Natural and anthropogenic activities are the major sources of fluoride pollution in water ecosystems.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…Various operating parameters, such as the electrode material (aluminum and iron), the current density (0.5-2 mA/cm 2 ), the duration of electrolysis, the supporting electrolyte dosage (0.01-0.03 M Na 2 SO 4 ), the initial pH (4)(5)(6)(7)(8), and the presence of other ions (Ca 2+ , Mg 2+ , PO 3À 4 and SO 2À 4 ), were examined to achieve optimal performance of the process. The experimental results revealed that fluoride removal was enhanced at pH 6, higher current density, and higher EC time when the aluminum electrode was used.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…The presence of fluoride in high concentrations in drinking water is a public health problem; consequently, its removal is a very essential process and has been the focus of many studies all over the world [1][2][3][4][5][6]. If the fluoride concentration increases to more than 4 mg/L in drinking water, skeletal fluorosis and fluorosis deformity in hips, knees, and other joints can be observed [7].…”

Section: Introductionmentioning

confidence: 99%

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Predictive equations for the defluoridation by electrocoagulation technique using bipolar aluminum electrodes in the absence and presence of additives: a multivariate study

Naim

Moneer

El‐Said

2015

Desalination and Water Treatment

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A B S T R A C TThe adverse public health problem due to the fluoride that is found in drinking water and waste water is of great concern. In the present work, the effect of different variables on the defluoridation by electrocoagulation (EC) process was studied. The variables were analar and commercial sodium fluoride solutions, different fluoride concentrations, pH of solution, temperature, speed of agitation, electrode spacing, type of comprising water, electrolyte additives (NaCl, KCl, NH 4 Cl, and CH 3 COONH 4 ), and mono and bipolar configurations. The present data indicated that the time required to reach the highest % extractions for the different concentrations of fluoride solutions (57.90, 42.30, 29.0, 21.50, 11.60, and 6.44 mg/L) was 5-15 min. Among the studied variables that significantly affected the maximum defluoridation efficiency, the type of comprised water was the only variable that did not pose observable effect. Statistically, a multivariate study was applied to get a set of predictive multiple regression equations, those were under constant and variable conditions of the fluoride removal process. Interestingly, these equations significantly represented the EC defluoridation technique under the studied variables. Due to the high economic value, the low applicable energy, as well as the saving of time that belong to the process of fluoride removal by EC, it is advisable to use the predictive equations for the EC defluoridation of different waters and wastewaters under the same conditions .

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“…But, as far as the authors knowledge, very few literatures are available for defluoridation by EC using Fe electrodes [33,34]. Drouiche et al investigated about fluoride removal from photovoltaic wastewater by EC using iron bipolar electrodes.…”

Section: Introductionmentioning

confidence: 99%

Comparison and understanding of fluoride removal mechanism in Ca2+, Mg2+ and Al3+ ion assisted electrocoagulation process using Fe and Al electrodes

Govindan

Raja

Maheshwari

et al. 2015

Journal of Environmental Chemical Engineering

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Fluoride Removal from pretreated Photovoltaic Wastewater by Electrocoagulation: An Investigation of The Effect of Operational Parameters

Cited by 72 publications

References 33 publications

Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation

Removal of fluoride and turbidity from semiconductor industry wastewater by combined coagulation and electroflotation

Predictive equations for the defluoridation by electrocoagulation technique using bipolar aluminum electrodes in the absence and presence of additives: a multivariate study

Comparison and understanding of fluoride removal mechanism in Ca2+, Mg2+ and Al3+ ion assisted electrocoagulation process using Fe and Al electrodes

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