Treatment of fluoride concentrates from membrane unit using salt solutions

Jadhav, S.; Gadipelly, Chandrakanth; Marathe, Kumudini V.; Rathod, Virendra K.

doi:10.1016/j.jwpe.2014.04.004

Cited by 29 publications

(8 citation statements)

References 29 publications

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“…The fluoride from groundwater can be removed upto 96% from the initial concentration of 109 mg/L using lime (Reardon and Wang, 2000). Similar findings on F removal by calcium salts have been confirmed by Jadhav et al (2014).…”

Section: Chemical Precipitation/coagulation (Cpc)supporting

confidence: 74%

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

Jadhav

Bringas

Yadav

et al. 2015

Journal of Environmental Management

479

146

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Section: Chemical Precipitation/coagulation (Cpc)supporting

confidence: 74%

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

Jadhav

Bringas

Yadav

et al. 2015

Journal of Environmental Management

479

146

View full text Add to dashboard Cite

“…This may be explained by the CaF 2 particle size which makes the particle-bubble attachment difficult and hence reduces the separation efficiency. Several literature results reported that the particle size of the formed CaF 2 precipitate was about 2 μm [10]. However, the turbidity removal efficiency clearly improved with increasing coagulant concentration.…”

Section: Effect Of Coagulant Dosementioning

confidence: 88%

“…This may be explained by the size of CaF 2 particles originating from the reaction of fluoride with CaCl 2 which are too fine and hence require higher doses of Al(OH) 3 to ensure coagulation [1]. Jadhav et al [10] stated that the particle size obtained with Ca(OH) 2 is greater than that obtained with CaCl 2 . This is due to the fact that, lime itself acts as a coagulant when dissolved in water.…”

Section: Effect Of Neutralizing Salt Naturementioning

confidence: 99%

“…Thus, a polishing step is needed to lower the suspended solids and fluoride concentrations after calcium precipitation. Various treatment technologies, such as coagulation, electrocoagulation-flotation [7][8][9], membrane separation [10], fluidized-bed precipitation [11] have been proposed. In practice, the most recently applied method consists of coagulation followed by flocculation and sedimentation [12].…”

Section: Introductionmentioning

confidence: 99%

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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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“…In many places worldwide, Fand As concentrations show a significant co-contamination in groundwaters whit concentrations up of 29 mg L -1 and 5300 µg L -1 for Fand As, respectively [5]. In the actuality water contaminated with Fand As is a concern, which requires an efficient treatment.…”

Section: Introductionmentioning

confidence: 99%

Reuse of Electrocoagulated Metal Hydroxide Sludge to Fluoride and Arsenic Removal by a Fixed-Bed Column in Continuous Operation

García-Gómez¹,

Rivera-Huerta²,

Almazán-García³

et al. 2018

Preprint

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In the present study, Electrocoagulated Metal Hydroxide Sludge (EMHS) was analyzed as adsorbent material to remove both fluoride ion (F-) and arsenic V (As(V)) from aqueous effluents. This material was generated during an electrocoagulation process using Aluminum anode. It was characterized by using specific surface areas and the surface morphology was studied by scanning electron microscopy (SEM). Adsorbent fixed-beds are generally studied to remove different class of contaminants. EMHS was evaluated using a continuous flow rate column test with an experimental design. The effect of initial concentration of F- (2.5–10 mg L−1) and the Empty Bed Contact Time (EBCT (0.4–0.8 min)) was studied following a central composite design methodology. The experimented parameters had a significant influence on saturation time, breakthrough volume, and breakthrough time. A response surface analysis was a tool for analyzing the adsorption study, showing interactions that are complicated to identify by others methods. The results, here reported, revealed that EMHS is an efficient and promising adsorbent material in order to remove F- and As(V) from water contaminated by these pollutants.

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Treatment of fluoride concentrates from membrane unit using salt solutions

Cited by 29 publications

References 29 publications

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

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

Reuse of Electrocoagulated Metal Hydroxide Sludge to Fluoride and Arsenic Removal by a Fixed-Bed Column in Continuous Operation

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