Defluoridation of drinking water using adsorption processes

Loganathan, P.; Vigneswaran, S.; Kandasamy, Jaya; Naidu, Ravi

doi:10.1016/j.jhazmat.2012.12.043

Cited by 295 publications

(162 citation statements)

References 82 publications

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“…The sole culprit behind this is fluoride, mainly in drinking water. Thus, the most effective way of cutting down the occurrence of fluorosis would involve defluoridation of drinking water [1,2] Several defluoridation techniques with various successes are reported [3][4][5]. These include; adsorption/ion exchange, precipitation/coagulation, reverse and forward osmosis, and electrolysis as shown in table 1.…”

Section: Introductionmentioning

confidence: 99%

“…These include; adsorption/ion exchange, precipitation/coagulation, reverse and forward osmosis, and electrolysis as shown in table 1. Among these, adsorption seems to be economical and user-friendly especially in the developing world [3,5] where point of use treatment is recommended [1]. Different adsorbents have different limitations; for instance, synthetic ion exchangers are relatively expensive and work better under acidic pH [3].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Stereochemistry of the Active Compounds on Fluoride Adsorption Efficiency of the Plant Biomass

Mwakabona

Machunda

Njau

2014

AJCHE

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Several studies have reported various defluoridation capabilities of plant biomasses. The resultant variations in fluoride removal capacities are associated with the presence of different types of active functional groups in the respective biomasses. This study reports of the fluoride removal efficiencies of sisal leaf biomass in comparison. Comparison with other plant biomasses were made and hence the fluoride removal efficiencies of maize leaf (ML), goose grass (GG), banana false stem (BFS), Aloe vera (AV), untreated sisal fibre (USF) and sisal pith (SP) with similar active functional groups but different stereochemistry and solubility of the active compounds are reported. A portion of 0.5 g of each biomass was mixed with a 10 mg/l fluoride solution in a 10 ml portions under the same experimental conditions. The maximum fluoride removal capacity of sisal fibre biomass was found to be 26.6 %. By comparison, the fluoride removal efficiencies of ML, GG, BFS, AV, USF and SP were found to be, 4.1, 4.6, 7.1, 26.6, 29.4 and 47.3 % respectively. This suggests that, stereochemistry and solubility of the active compounds have a significant role to play in water defluoridation by plant biomasses, and thus, knowledge of the stereochemistry and solubility of the active compounds in plant biomass is very important to fully unlock biomass' defluoridation potentials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Stereochemistry of the Active Compounds on Fluoride Adsorption Efficiency of the Plant Biomass

Mwakabona

Machunda

Njau

2014

AJCHE

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“…Ukoliko se u strukturu formiranog alginatnog gela ugrade pozitivno naeletrisani multivalentni katjoni (npr. Fe 3+ , Al 3+ , Ce 3+ , La 4+ , Zr 4+ ) može se povećati adsorpcioni kapacitet alginata [22,23]. Joni aluminijuma pri geliranju alginata daju fizički najstabilnije gelove, a uz to imaju i veliki afinitet prema fluoridnim jonima.…”

Section: Uvodunclassified

Fluoride ion adsorption onto Al-alginate particles

Milivojević¹,

Jocic²,

Lopičić³

et al. 2017

Zas Mat

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“…According to the solubility product of CaF2 (3.9×10 -11 mol 3 /l 3 ), 8.8mg/l of calcium is sufficient to obtain 8 mg/l of fluoride theoretically; however, in the actual cases, an 8-mg/l concentration of fluoride cannot be achieved even by adding 300 mg/l of excess calcium. As a result, secondary treatments, such as ion exchange or the addition of aluminum, are introduced to meet the regulation [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Removing Fluoride From a Hot Spring Using an Electrolysis System

Imai¹

2017

GEOMATE

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A high concentration of fluoride in the wastewater from hot springs is an environmental issue in Japan, since some of the wastewater exceeds the national minimum effluent standards of 8 mg/l. However, an effective treatment for fluoride removal has not yet been developed. Accordingly, the temporal effluent standards of 15mg/l -50 mg/l have, so far, been applied to the wastewater from hot springs.In this study, an electrolysis system consisting of an anode bath and a cathode bath separated by a diaphragm made of a clay panel was tested for the removal of fluoride. In an electrolysis system, fluoride is removed by co-precipitation with magnesium hydroxide formed in a cathode bath under a high pH condition.As a pretreatment of wastewater, 100 mg/l of magnesium was added to water from Gero hot spring, Gifu, Japan, to enhance the formation of the precipitation of magnesium hydroxide, since water from Gero hot spring contains less than 1 mg/l of magnesium. Water from Gero hot spring to which 100 mg/l of magnesium had been added was treated by an electrolysis system with a flow rate of 10 l/day and a current of 120 mA. The electrolysis system reduced the fluoride concentration from 16.6 mg/l to 6.4 mg/l, which meets the national minimum effluent standards of 8 mg/l.

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Defluoridation of drinking water using adsorption processes

Cited by 295 publications

References 82 publications

The Influence of Stereochemistry of the Active Compounds on Fluoride Adsorption Efficiency of the Plant Biomass

The Influence of Stereochemistry of the Active Compounds on Fluoride Adsorption Efficiency of the Plant Biomass

Fluoride ion adsorption onto Al-alginate particles

Removing Fluoride From a Hot Spring Using an Electrolysis System

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