Use of laterite for the removal of fluoride from contaminated drinking water

ABSTRACT. In this study the fluoride removal potential of nanoscale aluminium oxide hydroxide (nanoAlOOH) has been investigated. The material was produced using aluminium nitrate (Al (NO3)3 . 9H2O, 95%), and ammonium bicarbonate (NH4HCO3, 98%) and its density and mineralogy were investigated. A series of batch adsorption experiments were carried out to assess parameters that influence the adsorption process. The parameters considered were contact time and adsorbent dose, initial fluoride concentration, and pH. Results showed that most of the adsorption took place during the first 30 min; and equilibrium was reached at one hour contact time with an optimum adsorbent dose of 1. . The adsorption data were well fitted to the Langmuir isotherm model with a maximum adsorption capacity of 62.5 mg F -g -1 . The kinetic studies showed that the adsorption of fluoride by nano-AlOOH obeys a pseudo-second order rate equation. The intraparticle diffusion was not a rate-controlling step for the adsorption process. Thus, the overall study indicates that nano-AlOOH is an efficient defluoridating material.

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“…The experimental data were well fitted to pseudo-second order rate equation by using the Lagergren's rate equation as shown below [33] and [34]:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorptive removal of fluoride from water using nanoscale aluminium oxide hydroxide (AlOOH)

Adeno¹,

Mulugeta²,

Zewge³

et al. 2014

Bull. Chem. Soc. Eth.

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“…LG was found to be a suitable low cost adsorbent for arsenic and fluoride removal by many researchers (Maiti et al 2013), (Srinivasa Rao, Anand, and Venkateswarlu 2010)(Sanjoy Kumar ), (Sarkar et al 2006). However, it was found that, as soil particle size decreases adsorption efficiency increases.…”

mentioning

confidence: 99%

“…However, it was found that, as soil particle size decreases adsorption efficiency increases. Small size particles at the times creates operational difficulties, for e.g., (Sarkar et al 2006) separation of finer laterite particles by filtration during batch operation, choking of laterite bed during column operation (Sarkar et al 2006). Limited studies have been carried out on the adsorption performance of LG of particle size ranging from 0.5 mm to 10 mm.…”

mentioning

confidence: 99%

Performance of Laterite Soil Grains as Adsorbent in the Removal of Chromium

2015

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The present study aims to examine the efficiency of laterite grains (LG) and acid activated laterite grains (AALG) as an adsorbent for removal hexavalent chromium and ferric ion from synthetic wastewater, under laboratory conditions. Adsorption of hexavalent chromium and ferric ion from synthetic wastewater is examined by batch and column studies wherein it is found to be dependent on pH, Contact time, adsorbent dosage and initial adsorbate concentration. Percentage removal enhances with the increase in adsorbent dosage and with low pH, the optimal removal is achieved at pH=2. AALG is found to investigate possibility of improvement in removal efficiency of hexavalent chromium. The removal efficiency of AALG is found to be significantly higher than the efficiency obtained from LG, at pH=7. An adsorbent dosage 2g of LG is found to be optimum for removal of ferric ion with low initial concentration of 2.5 mg/L. The equilibrium adsorption data obtained from batch studies were fitted with Langmuir and freundlich isotherm for both hexavalent chromium and ferric ions. The percentage removal obtained from batch adsorption studies were found to be higher than that obtained by column studies for both the adsorbates.

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“…Ma et al , 2008;Y. Ma et al , 2011;Medellin-Castillo et al, 2007;Sarkar et al, 2006;Srimurali et al , 1998;Tor et al , 2009;Yadav et al, 1999). The effective removal of fluoride depends on the initial concentration of fluoride, pH, contact time, operating temperature, type of adsorbent and its particle size (Feenstra et al, 2007;Mann & Mandal,2014;Piddennavar & Krishnappa, 2013).…”

Section: Adsorptionmentioning

confidence: 99%

Ex-Situ vs. In-Situ Defluoridation of the Contaminated Aquifers: A State-of-the-Art Review

Arora¹,

Gupta²

2017

Preprint

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A wide variety of pump and treat methods like chemical precipitation, adsorption, ion exchange and reverse osmosis have been trialled for many decades for fluoride removal from groundwater, but the problem of fluoride contaminated water remains in many parts of the world largely because these processes require constant monitoring, are expensive to implement and maintain at decentralised scale due to lack of reticulation infrastructure, and possess sludge disposal problem. This paper presents an overview of various fluoride removal processes and the limitations associated with each process and the application of in-situ permeable reactive barrier for remediating fluoride contaminated groundwater is explored, which displays the potential to be a cost effective, low maintenance and energy intensive technology.

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Use of laterite for the removal of fluoride from contaminated drinking water

Cited by 145 publications

References 35 publications

Adsorptive removal of fluoride from water using nanoscale aluminium oxide hydroxide (AlOOH)

Adsorptive removal of fluoride from water using nanoscale aluminium oxide hydroxide (AlOOH)

Performance of Laterite Soil Grains as Adsorbent in the Removal of Chromium

Ex-Situ vs. In-Situ Defluoridation of the Contaminated Aquifers: A State-of-the-Art Review

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