Effect of aluminum fluoride complexation on fluoride removal by coagulation

Gong, Wen-Xin; Qu, Jiuhui; Liu, Ruiping; Lan, Huachun

doi:10.1016/j.colsurfa.2011.12.010

Cited by 132 publications

(74 citation statements)

References 16 publications

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“…It was inferred that fluoride favored the formation of Al c . It was attributed to that the replacement of some hydroxyls by fluoride ions due to their similar chemical property contributed to the transformation of Al ions with less OH À to induce precipitation [7]. …”

Section: Al Species Distribution Of Different Al Coagulants Over Ph 4-9mentioning

confidence: 99%

“…In this case fluoride removal was mainly attributed to physical adsorption and ion exchange effects [4,31], and the weakly acidic and acidic pH favored its removal. In B ranges from 1.0 to 1.5, PACl includes different Al species such as Al 2 , Al 4 , Al 7 and Al 13 et al [27], the ratios of monomeric Al species were observed to increase with lowered B. In this case coagulation dominated in the removal of fluoride, and different mechanisms such as complexed precipitation, charge attraction, and ion exchanges involve in and facilitated fluoride removal accordingly [32,33].…”

Section: Removal Efficiency Of Fluoride By Pacl With Different Basicitymentioning

confidence: 99%

“…After addition of the Al-based coagulant, the following procedure consisted of 2 min of mixing at 100 rpm, with pH adjusted to the desired value, 2 min rapid mix at 200 rpm, 15 min slow mix at 40 rpm, and 30 min of settling. After settling for 30 min, supernatants were filtered through , and the concentrations of Com-F were obtained by total fluoride concentration minus free fluoride concentration according to the methods of our previous study [7]. The residual Al concentrations were measured by ICP-OES.…”

Section: Jar Testmentioning

confidence: 99%

“…Our previous study indicates that the formation of Al-F complexes involves the removal of fluoride by AlCl 3 , and this effect benefits fluoride removal to a large extent as compared to Al (OH) 3 adsorption [7]. The transformation of different fluoride species, i.e., free fluoride, complexed fluoride (Com-F), and adsorbed fluoride, plays a determining role and is highly dependent on solution pH and the ratio of fluoride to Al (R F:Al ) [8,13].…”

Section: Introductionmentioning

confidence: 99%

“…The removal of fluoride from drinking water has received great attention in the past several decades. Defluoridation can be achieved by different processes such as adsorption [4][5][6], (electro)-coagulation [7][8][9], ion-exchange [10], membrane separation [3], and the Nalgonda process [11]. Among these technologies, coagulation is widely applied due to its simplicity and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Lan

Gong

et al. 2016

Separation and Purification Technology

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a b s t r a c tThis study investigates the effects of aluminum (Al) and F interactions on the coagulation behaviors of Al salts, i.e., AlCl 3 and polymer aluminum chloride (PACl) at different basicity (B) towards fluoride. These coagulants achieve the optimum fluoride removal over pH 6-7, and PACl exhibits higher removal efficiency than AlCl 3 does over pH 4-9. The removal of fluoride is positively correlated with the content of either Al 13 or Al b in Al-based coagulants over pH 4-9 and increases in the order: PACl 2 > PACl 1 > AlCl 3 . As for PACl, the increased B from 0 to 2.4 improves fluoride removal owing to the elevated ratios of Al b . However, at further increased B to 2.8, the formation of colloidal Al species

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Section: Al Species Distribution Of Different Al Coagulants Over Ph 4-9mentioning

confidence: 99%

Section: Removal Efficiency Of Fluoride By Pacl With Different Basicitymentioning

confidence: 99%

Section: Jar Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Lan

Gong

et al. 2016

Separation and Purification Technology

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Simultaneous adsorption of manganese and fluoride from aqueous solution via bimetal impregnated activated carbon derived from waste tire: Response surface method modeling approach

Bose

Mukherjee

Rahaman

2021

Env Prog and Sustain Energy

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Adsorptive removal of manganese and fluoride from wastewater by waste tire-derived activated carbon impregnated with iron and cobalt has been presented in this article. The surface properties of bimetallic activated carbon were characterized in scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and X-ray diffraction (XRD). The newly developed adsorbent was used for simultaneous removal of fluoride and manganese from aqueous solution. Present work focuses on the optimization of process parameters using response surface method (RSM) technique employing significant parameters, namely, adsorbent dosage, initial fluoride and manganese concentrations, contact time and pH. Central composite design in RSM was utilized for the levels of adsorbent dosage (0.5-1 g/L), initial fluoride concentration (20-40 ppm), initial manganese concentration (30-50 ppm), time (15-35 min), and pH (4-8) of the solution. The R 2 value obtained from the statistics data was 96.25 and 97.57% for fluoride and manganese, respectively. The optimal values were determined as the adsorbent dosage of 1.25 g/L, initial fluoride concentration of 10 ppm, initial manganese concentration of 25.25 ppm, the contact time of 30.9 min and pH of solution of 2.0, under which 99.96% manganese and 85.34% fluoride removal efficiency could be accomplished. K E Y W O R D S activated carbon, adsorption of Mn and F, iron-cobalt nanocomposite, response surface method, waste tire | INTRODUCTIONSupervision of harmful ions, like manganese and fluoride, is of public health concern since manganese affects the central nervous system of the human body and fluoride is accountable for bone fluorosis. 1 Fluoride is useful to human health at very low concentrations, it inhibits dental caries and benefits in bone strength. However, higher than a tolerable level of 1.5 ppm, fluoride leads to several complications such as skeletal and dental fluorosis, diminished birth rates, neurological disorders, and lower intelligence quotient. Fluoride cannot exist in elemental form in the environment owing to its high electronegativity and reactivity. 2 The epidemiological studies demonstrate that drinking water is the most common method of fluoride entrance into the human body. 3 Manganese is a trace element valuable for the operation of the human body (2-5 mg/day), but as heavy metal, it is very toxic, particularly after contact with a high dose. The long-time exposure to manganese upsets several systems in the human body such as cardiac systems, reproductive, respiratory and neurological illness clinics called manganism. 4,5 According to WHO, the extremely tolerable limit of manganese in drinking water is 0.5 mg/L. 6,7 The means that have been adopted for the removal of manganese and fluoride from polluted water are precipitation, 8 membrane processes, 9 ion exchange, 10 adsorption, 11 coagulation, 12 and electrochemical treatments. 13

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Experimental evaluation of sand filtration and ultrafiltration as subsequent treatment of coagulation for fluoride removal

Dubey

Agarwal

Gupta

2021

Env Prog and Sustain Energy

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Fluoride concentration in groundwater above than the prescribed value by WHO (>1.5 mg/L) has led to severe health issues. One of the fluoride removal techniques that are low cost and highly efficient is the coagulation technique. Aluminum salts are used as coagulants along with lime to maintain desired pH. The main drawback of this technique is the large concentration of aluminum in treated water. Therefore, the present study aims to lower down the aluminum concentration in the defluoridated water within the acceptable limits by applying sand filter and ultrafiltration membrane subsequently. Aluminum removal efficiency of ultrafiltration was almost 90% and 70% for sand filtration. In terms of energy consumption, ultrafiltration consumed 60 kWh/m3 and sand filtration consumed 6.2 kWh/m3. Cost analysis was also done and it was observed that sand filter was more cost effective than ultrafiltration. Also, ultrafiltration consumed 10 times higher energy than sand filter for treating 1 m3 of water.

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Effect of aluminum fluoride complexation on fluoride removal by coagulation

Cited by 132 publications

References 16 publications

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

Simultaneous adsorption of manganese and fluoride from aqueous solution via bimetal impregnated activated carbon derived from waste tire: Response surface method modeling approach

Experimental evaluation of sand filtration and ultrafiltration as subsequent treatment of coagulation for fluoride removal

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