Study of a new technique for fluoride removal from water

Lounici, H.; Addour, L; Belhocine, D.; Grib, H.; Nicolas, Stéphane; Bariou, B.; Mameri, N.

doi:10.1016/s0011-9164(98)00016-2

Cited by 109 publications

(51 citation statements)

References 9 publications

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“…However, the process generates large amounts of fluoride-containing sludge and causes an unavoidable sludge treatment and disposal problem with increased costs 5 . Other methods, which include ion exchange, membrane (including reverse osmosis and nano-filtration), Donnan dialysis and integrated physiochemical and biological adsorption on active alumina, fly ash and carbon nano-tubbe etc., have all been used for fluoride removal practice [6][7][8][9][10][11][12] . Among the various methods, it has been accepted that the ion exchange electro-dialysis and membrane processes are effective and can remove the fluoride to a suitable level.…”

Section: Introductionmentioning

confidence: 99%

Deflouridation from Aqueous Solutions Using Alum

Subhashini¹,

Swamy²,

Krishna³

2012

Chem Sci Trans

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This research work has been designed to remove the fluoride from aqueous solutions using alum by bench scale experiments. The defluoridating agent, which is easily available even in rural areas, has been selected. The known concentrations of fluoride solution were prepared. The removal of fluorides by the defluoridating agent was studied up to 4 hours for all the fluoride concentrations. The variations in the percentage removal and attainment of equilibrium were recorded. The solutions of 2, 4, 6, 8 and 10 mg/L were prepared. Each Fluoride concentration was tested with 100, 200 and 300 mg/L of alum. The removal of fluoride increased at the rate of 10% per hour up to 55% by 4 h for 100 and 200 mg/L while it rose from 40 to 60% by 4 h equilibration time in 300 mg/L alum solution it reaches 60%. The difference of fluoride removal between 100 and 300 mg/L alum concentrations was only 5% i.e. 0.9 and 0.8 mg/L of fluoride remained after 4 h equilibration time. All the concentrations of defluoridating agent have successfully reduced the fluoride content in waters to permissible limits.

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Section: Introductionmentioning

confidence: 99%

Deflouridation from Aqueous Solutions Using Alum

Subhashini¹,

Swamy²,

Krishna³

2012

Chem Sci Trans

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“…However, the viability of adsorption techniques is greatly dependent on the development of adsorptive materials and optimization of the performance of adsorbents. Among various adsorbents tested for fluoride removal from aqueous solutions, activated alumina (AA) appears as one of the most studied adsorbents [11][12][13][14][15]. According to USEPA, the best two technologies generally available (BTGAs) for fluoride removal are (1) adsorption on activated alumina and (2) reverse osmosis [16].…”

Section: Introductionmentioning

confidence: 99%

Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique

Mohapatra

Rout

Singh

et al. 2011

Journal of Hazardous Materials

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Experimental procedure MaterialsFe(NO 3 ) 3 .7H 2 O and cetyltrimethyl ammonium bromide (CTAB) used for synthesis were of Analytical Grade (E Merck, India). Sodium fluoride (Ranchem, India) was used for the preparation of the standard fluoride (1000 mg/L) stock solution. Sodium 2-(para sulfophenyl azo)-1,8-dihydroxy-3,6-naphthalene disulfonate (SPADNS) and zirconyl oxychloride used for fluoride analysis were of GR (E. Merck) grade. Preparation of mixed iron oxide/hydroxide sample by surfactant mediationprecipitation techniquePage 5 of 38A c c e p t e d M a n u s c r i p t 5 100 mL of a 0.88 M Fe(NO 3 ) 3 was taken in a clean, dry beaker. To this 5 mL of 10 % cetyltrimethyl ammonium bromide (CTAB) solution was added and the solution was stirred for 2 h. The pH of the solution was adjusted to 10.0 by addition of 1 M NaOH solution under stirring. The contents were further stirred for 24 h after pH adjustment. The precipitate formed was filtered through a G4 frit crucible and was thoroughly washed with water until the filtrate was free of nitrate. The precipitate was then transferred to a beaker and the volume made up to 500 mL with water. The beaker was kept at 60 0 C for 12 h in an oven. After aging, the solution was finally filtered through a G4 crucible, washed thoroughly with water and dried in an oven at 100 0 C for 24 h. Batch fluoride sorption experiments on the prepared sample and fluoride analysisA 100 mg/L fluoride stock solution was prepared by dissolving 0.221g of NaF in 1L of double distilled water. The experimental solutions were prepared by appropriate dilutions of the above solution. 0.1 g of the sample was taken in a 100 mL polyethylene plastic vial and 50 mL of fluoride solution of known concentration was added. The contents were kept for constant shaking in a temperature controlled water bath shaker

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“…The electrostatic repulsion on the surface of composite electrodes led to a larger amount of positive charges at low pH (Ayranci and Duman 2005), causing higher desalination efficiency to some extent. Though pH was observed as sensitive parameters for fluoride electrosorption removal (Lounici et al 1997), chloride had higher ion strength and was only slightly affected by the hydroxide ion during the electrosorption process. pH was not the restriction factor for the desalination efficiency of industrial wastewater with high sodium chloride concentration.…”

Section: Ph Valuementioning

confidence: 98%

Electrosorption for organic pollutants removal and desalination by graphite and activated carbon fiber composite electrodes

Zhou

Wang

et al. 2015

Int. J. Environ. Sci. Technol.

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This paper investigates a new type of carbonbased electrodes, which were equipped with graphite and activated carbon fiber composite, to improve the performance of electrosorption. The results indicated that the highest desalination efficiency achieved 55 % and the optimal condition was 1.6 V voltage, 60 min retention time and 1.0 cm electrode distance. Freundlich isotherms successfully fitted with the respective behavior of the composite electrode and provided theoretical evidence for the desalination performance improvement. Applied in real black liquor of refined cotton, the graphite and activated carbon fiber composite electrodes achieved high removal efficiency for conductivity (59 %) and COD Cr (76 %). Similar removal performance was also observed in sodium copper chlorophyll wastewater, and removal efficiency was 37 % for conductivity and 14 % for COD Cr . For the first time, this research demonstrated the biodegradability improvement in real industrial wastewater via electrosorption treatment, suggesting a potential pretreatment technique for high-salinity wastewater.

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Study of a new technique for fluoride removal from water

Cited by 109 publications

References 9 publications

Deflouridation from Aqueous Solutions Using Alum

Deflouridation from Aqueous Solutions Using Alum

Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique

Electrosorption for organic pollutants removal and desalination by graphite and activated carbon fiber composite electrodes

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