A Conceptual Overview on Sustainable Technologies for the Defluoridation of Drinking Water

Ayoob, S.; Gupta, Ajita; Bhat, Venugopal T.

doi:10.1080/10643380701413310

Cited by 309 publications

(147 citation statements)

References 163 publications

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“…Therefore, treatment of all the water sources containing fluoride above the acceptable level is essential for potable purposes. Ayoob et al (2008) assessed the conceptual overview on sustainability of different defluoridation technologies and indicated that despite the fact that membrane and electrochemical techniques have high capacity of fluoride removal they are not widely used because they are costly and energy intensive. Adsorption is considered an appropriate technique for small community water source defluoridation compared to other techniques (Mohapatra et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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High concentrations of fluoride in drinking water is a public health concern globally and of critical importance in the Rift Valley region. As a low-cost water treatment option, the defluoridation capacity of locally available iron ore was investigated. Residence time, pH, agitation rate, particle size of the adsorbent, sorbent dose, initial fluoride concentration and the effect of co-existing anions were assessed. The sorption kinetics was found to follow pseudo-first-order rate and the experimental equilibrium sorption data fitted reasonably well to the Freundlich model. The sorption capacity of iron ore for fluoride was 1.72 mg/g and the equilibrium was attained after 120 min at the optimum pH of 6. The sorption study was also carried out at natural pH conditions using natural ground water samples and the fluoride level was reduced from 14.22 to 1.17 mg/L (below the WHO maximum permissible limit). Overall, we concluded that iron ore can be used in water treatment for fluoride removal in the Rift Valley region and beyond.

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Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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“…Najčešće primenjivane metode su koagulacija i hemijsko taloženje, membranski procesi (reverzna osmoza, nanofiltracija dijaliza), elektrohemijski procesi, jonoizmenjivački procesi kao i mnogobrojne vrste adsorpcije [1, [13][14][15]. Međutim, usled visokih investicionih i/ili operativnih troškova, kao i ograničenih radnih uslova, većina ovih metoda i pored če-sto velike efikasnosti ima i značajne nedostatke, naročito pri niskim koncentracijama fluorida, koje su realno prisutne u vodi za piće.…”

Section: Uvodunclassified

“…Međutim, usled visokih investicionih i/ili operativnih troškova, kao i ograničenih radnih uslova, većina ovih metoda i pored če-sto velike efikasnosti ima i značajne nedostatke, naročito pri niskim koncentracijama fluorida, koje su realno prisutne u vodi za piće. Zato se uklanjanje fluorida najčešće vrši adsorpcijom, usled njene jednostavnosti, niske cene, kao i činjenice da se može primeniti i pri niskim koncentracijama fluoridnih jona [1, 13,16]. Najčešće korišćeni prirodni i veštački adsorbenti za fluor su aktivni ugalj i razni karbonatni materijali, aktivna alumina, hidroksiapatiti, zeoliti, oksidi cirkonijuma, gvožđa i cerijuma, gline, kao i mnogi drugi materijali [1, 14,17].…”

Section: Uvodunclassified

Fluoride ion adsorption onto Al-alginate particles

Milivojević¹,

Jocic²,

Lopičić³

et al. 2017

Zas Mat

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“…The other adsorbents previously studied for fluoride removal include bone char, activated carbon, activated bauxite, ion-exchange resins, fly ash, super phosphate and tricalcium phosphate, clays and soils, synthetic zeolites and other minerals (Ayoob et al 2008). It was found that hydroxyapatite synthesized using locally available materials can effectively remove fluoride at considerable low costs.…”

Section: Introductionmentioning

confidence: 99%

Enhanced fluoride removal by hydroxyapatite-modified activated alumina

Tomar

Thareja

Sarkar

2014

Int. J. Environ. Sci. Technol.

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Fluoride in drinking water is beneficial at low concentrations but is considered harmful for the human health when present at concentrations exceeding 1.5 mg/L. Prevalence of high concentration of fluoride in drinking water, combined with the nonavailability of alternate viable sources, makes the treatment of the contaminated water an essential task. In this study, we report the synthesis and characterization of a hybrid adsorbent; hydroxyapatitemodified activated alumina (HMAA) prepared by dispersing nanoparticles of hydroxyapatite inside activated alumina granules. The composite adsorbent provided a synergy toward fluoride removal from contaminated drinking water. The hybrid adsorbent possesses a maximum adsorption capacity of 14.4 mg F/g which is at least five times higher than the virgin-activated alumina, which has been used extensively for fluoride removal. HMAA was regenerated using six bed volumes of a solution containing commonly available innocuous chemicals. The adsorbent was subjected to multiple numbers of operating cycles within a column, each cycle consisting of one adsorption run followed by regeneration.

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A Conceptual Overview on Sustainable Technologies for the Defluoridation of Drinking Water

Cited by 309 publications

References 163 publications

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Fluoride ion adsorption onto Al-alginate particles

Enhanced fluoride removal by hydroxyapatite-modified activated alumina

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