Effects of co-existing anions on fluoride removal in electrocoagulation (EC) process using aluminum electrodes

Hu, Ching Yao; Lo, Shang Lien; Kuan, Wen-Hui

doi:10.1016/s0043-1354(03)00378-6

Cited by 250 publications

(125 citation statements)

References 24 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…Recently, some of scientific literatures reported that the EC process performed better than CC (chemical coagulation) process in defluoridation efficiency [20][21][22][23]. Thus, the EC/FB/ME process is the best suitable for treatment of fluoride ion in wastewater.…”

Section: Fementioning

confidence: 99%

Removal of Copper and Fluoride from Wastewater by the Coupling of Electrocoagulation, Fluidized Bed and Micro-Electrolysis (EC/FB/ME) Process

Khuê¹

2014

AJCHE

View full text Add to dashboard Cite

Abstract:Copper and fluoride ions were removed from wastewater by the coupling of electrocoagulation, fluidized bed and micro-electrolysis (EC/FB/ME) process. The results indicate that the use of aluminum electrode for simultaneous removal of copper and fluoride ions is better than iron electrode. By the orthogonal experiments study of the main factors influencing the efficiency of the treatment process, the best control parameters of this process were achieved in four aluminum electrodes, an initial pH of 5.0, a hydraulic retention time of 30 minutes, an applied voltage of 5V, a mass of iron-carbon (Fe/C) of 45g and the particle diameter of Fe/C of 20-27 mesh. With these conditions and the initial concentration of ions of 50mg/L, the residual concentration of copper and fluoride are 0.205 mg/L and 2.936 mg/L, respectively. The EC/FB/ME process is suitable for treatment of wastewater that fluoride concentration is less than 50 mg/L and copper concentration is less than 200 mg/L. This process was successfully applied to the treatment of a smelting wastewater sample.

show abstract

Section: Fementioning

confidence: 99%

Removal of Copper and Fluoride from Wastewater by the Coupling of Electrocoagulation, Fluidized Bed and Micro-Electrolysis (EC/FB/ME) Process

Khuê¹

2014

AJCHE

View full text Add to dashboard Cite

show abstract

“…A variety of treatment procedures have been reported for the removal of excess fluoride from polluted waters based on precipitation (Aldaco et al 2007;Akbar et al 2008;Reardon and Wang 2000;Cengeloglu et al 2002;Yadav et al 2006;Nawlakhe et al 1975;Saha 1993), ion exchange (Meenakshi and Viswanathan 2007;Castel et al 2000;Feng Shen et al 2003;Chubar et al 2005;Apambire et al 1997;Singh et al 1999), reverse osmosis (Sehn 2008;Simons 1993), Donnan dialysis (Tor 2007;Garmes et al 2002;Hichour et al 1999), electrodialysis (Lahnid et al 2008;Menkouchi et al 2007;Hichour et al 2000;Adikari et al 1989;Amer et al 2001), nanofiltration ), membrane-based methods (Dieye et al 1998;Mjengera and Mkongo 2003;Lhassani et al 2001;Mameri et al 2001), electrocoagulation (Hu et al 2003), and adsorption on to various adsorbents (Shihabudheen et al 2006;Onyango et al 2006;Tripathy et al 2006;Mohapatra et al 2004;Raichur and Jyoti Basu 2001). The choice of the method depends on conditions like area, concentration, availability of resources, etc.…”

Section: Introductionmentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

View full text Add to dashboard Cite

Background: Deleterious effects of fluoride contamination in ground waters on the health of human beings are well known and intensive research on developing de-fluoridation methods is globally pursued. Of the various methodologies, increasing interest is being envisaged in using the adsorption methods based on active carbons derived from plant material. In the present investigation, Nitric acid activated carbon derived from barks of Vitex negundo plant (NVNC) is probed for its de-fluoridation abilities. Methods: The activated carbon is characterized adopting various physicochemical methods and surface morphological studies are carried out using FT-IR and SEM-EDX techniques. The effect of various parameters such as pH, sorbent dosage, agitation time, initial concentration of fluoride, temperature, particle size and presence of foreign ions on the extraction of the fluoride is studied adopting Batch methods.The adsorption process is analyzed with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherms and kinetics of adsorption is studied using pseudo first-order, pseudo second-order, Weber and Morris intraparticle diffusion, Bangham's pore diffusion and Elovich equations. The methodology developed is applied to real ground water samples.

show abstract

“…Generally, the Fe and Al plates are used as anode materials and stainless steel is used as cathode material (Holt et al, 2002;Mollah et al, 2004). EC has been employed to perform defluoridation (Mameri et al, 1998;Hu et al, 2003). In the EC cell using Al as anode, sacrificial dissolution of aluminum gives Al 3+ , which precipitates as Al(OH) 3 in solutions of near neutral pH (Canizares et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

et al. 2011

View full text Add to dashboard Cite

a b s t r a c tAn integrated electro-oxidation and electrocoagulation system was designed and used to remove As(III) and F À ions from water simultaneously. Dimensionally stable anodes (DSA), Fe electrodes, and Al electrodes were combined into an electrochemical system. Two pieces of DSA electrodes were assigned as the outside of the Fe and Al electrodes and were directly connected to the power supply as anode and cathode, respectively. The Fe and Al ions were generated by electro-induced process simultaneously. Subsequently, hydroxides of Fe and Al were formed. Arsenic ions are mainly removed by iron hydroxides and F À ions are mainly removed by the Al oxides. At the initial concentration of 1.0 mg L À1 , most of As(III) was transferred into As(V) within 40 min at current density of 4 mA cm À2 , whereas F À ions can be efficiently removed simultaneously. The effect of the ratio of Fe and Al plate electrodes and current density on the removal of As(III) and F À was investigated. With one piece of Fe plate electrode and three pieces of Al plate electrodes, it is observed that As(III) with concentration of 1 mg L À1 and F À with concentration of 4.5 mg L À1 can be removed and their final concentrations were below the values of 10 lg L À1 and 1.0 mg L À1 , respectively within 40 min. Removal efficiency of As(III) increases with the increase of solution pH. However, in the pH range of 6-7, removal efficiency of F À is the largest.

show abstract

Effects of co-existing anions on fluoride removal in electrocoagulation (EC) process using aluminum electrodes

Cited by 250 publications

References 24 publications

Removal of Copper and Fluoride from Wastewater by the Coupling of Electrocoagulation, Fluidized Bed and Micro-Electrolysis (EC/FB/ME) Process

Removal of Copper and Fluoride from Wastewater by the Coupling of Electrocoagulation, Fluidized Bed and Micro-Electrolysis (EC/FB/ME) Process

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

Contact Info

Product

Resources

About