Defluoridation and deironing of ground water using polystyrene beads

Madhukar, M; Lavanya, R.; Amrutha, M. B.

doi:10.2166/ws.2013.116

Cited by 4 publications

(4 citation statements)

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“…Generally, people prefer underground water (artesian, spring and subsurface) when choosing a source of water supply. Groundwater is the main source of drinking water in many countries around the world (Sharma 2009;Madhukar et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of iron transformations kinetics and autocatalysis during its physicochemical removal from underground water

Martynov

Poliakov

2021

Water Supply

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The mathematical model of physicochemical iron removal from groundwater was developed. It consists of three interrelated compartments. The results of the experimental research provide information in support of the first two compartments of the mathematical model. The dependencies for the concentrations of the adsorbed ferrous iron and deposited hydroxide concentrations are obtained as a result of the exact solution of the system of the mass transfer equations for two forms of iron in relation to the inlet surface of the bed. An analysis of the experimental data of the dynamics of the deposit accumulation in a small bed sample was made, using a special application that allowed to select the values of the kinetic coefficients and other model parameters based on these dependencies. We evaluated the autocatalytic effect on the dynamics of iron ferrous and ferric forms. The verification of the mathematical model was carried out involving the experimental data obtained under laboratory and industrial conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental studies of iron transformations kinetics and autocatalysis during its physicochemical removal from underground water

Martynov

Poliakov

2021

Water Supply

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“…For iron removal of underground water are used various types of filtering downloads [BARLOKOVA, ILAVSKY 2010;MADHUKAR et al 2013]. The construction of the filtering equipment and auxiliary equipment usually depends on the type of downloads.…”

Section: Introductionmentioning

confidence: 99%

“…Expanded polystyrene proposed to use as download of fast filters for the first time at the Department of Water Supply and Drilling UIIWM (now National University of Water and Environmental Engineering, Ukraine). Many national and foreign scientists are engaged in research of foam polystyrene filters [LAVANYA et al 2014;MADHUKAR et al 2013].…”

Section: Introductionmentioning

confidence: 99%

Technological model of water contact iron removal

Martynov

Fylypchuk

Zoshchuk

et al. 2018

Journal of Water and Land Development

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Different types of filters are used to remove iron from underground water, one of them is foam polystyrene. Depending on the chemical water composition, tasks for water supply and other working conditions of iron-removing filters, it is necessary to define an exact grain size, specific granulometric composition, the thickness of the layer and the adequate rate of filtration. This kind of problems is multifactorial and its solution is based on the mathematical modelling.As a rule, two parallel processes considered during iron removal of underground water in filters: efficiency of water treatment and growth of head losses. Therefore, the model of water iron removal based on two main blocks, clarifying block takes into account the material balance and kinetics of the process; hydrodynamic block describes the dynamics of head loss in the granular loading. The kinetics of the detention of iron compounds in granular loading consists of two mutually opposite processes. With an increase of the amount of adsorption-catalytic precipitate, the rate of sorption of iron compounds and oxidation of ferric iron increases and the efficiency of iron-removing increases. On the other hand, with decreasing porosity of loading the true velocity of the fluid increases, that reduces the intensity of adhesion of iron compounds.Developed mathematical model allows for determining optimal values of structural and technological parameters of iron-removing filters taking into consideration the specific filtering conditions.

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“…Fluoride (F) is an essential trace element which is beneficial for human growth at low concentrations (0.4-1.0 mg/L) in drinking water [1][2][3]. Disproportionate amount of fluoride in water is an issue of serious health concern and elevated concentration of F in drinking water has been suspected being responsible for number of health problems such as dental fluorosis [1,[3][4][5][6], bone fluorosis [7], abrasion of the thyroid [8], endocrine glands, Alzheimer's disease [3], and nervous system failure [9].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of F on Bio-Filter sorbent: kinetics, equilibrium, and thermodynamic study

Yadav

Singh

Brighu

et al. 2015

Desalination and Water Treatment

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A B S T R A C TThe aim of this research work is to investigate the potential of a commercially available BioFilter (Bio-F) sorbent for defluoridation of drinking water. Batch equilibrium experiments were conducted with respect to change in pH of solution, initial concentration of F, contact time, and competitive anions to evaluate the fluoride adsorption behavior of Bio-F. Sorption of F onto Bio-F was found to be independent of pH. Scanning electron microscopy, sieve method, and porosity test were used to characterize the physical attributes of Bio-F. More than 97% removal of fluoride (28 mg/L) was achieved within 60 min of contact time at neutral pH. Results demonstrated that among the kinetic models tested, pseudo-second-order model fitted the kinetic data well with a correlation coefficient greater than 0.99, suggesting the chemisorption mechanism. Different adsorption isotherm models like Langmuir, Freundlich, Redlich-Peterson, Sips, and Toth were used to analyze the experimental data and the model parameters were evaluated. Experimental data revealed that three-parameter Redlich-Peterson Isotherm model gives best fit for F removal. The maximum adsorption capacity of Bio-F for F deduced from Langmuir model was~5.530 mg/g. The calculation of thermodynamic parameters at different temperatures showed that adsorption was spontaneous and endothermic. All studied competitive anions (SO 2À 4 , NO À 3 , Cl − ) have negligible effect on F sorption by Bio-F. Regeneration studies were performed by alum solution (3% aqueous solution) and boiling means. This study showed that the removal of F by Bio-F is a promising technique.

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Defluoridation and deironing of ground water using polystyrene beads

Cited by 4 publications

References 0 publications

Experimental studies of iron transformations kinetics and autocatalysis during its physicochemical removal from underground water

Experimental studies of iron transformations kinetics and autocatalysis during its physicochemical removal from underground water

Technological model of water contact iron removal

Adsorption of F on Bio-Filter sorbent: kinetics, equilibrium, and thermodynamic study

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