Optimization of electrocoagulation process for fluoride removal: a blending approach using gypsum plaster rich wastewater

Jadhao, Virendra K.; Kodape, Shyam; Junghare, Kunjan

doi:10.1186/s42834-019-0002-y

Cited by 12 publications

(3 citation statements)

References 23 publications

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“…There are different processes for separating fluoride from aqueous solutions [8]; however, adsorption is the most cost-effective method for water defluorination [9]. Diverse adsorbents have been tested for eliminating fluoride present in drinking water; among them are activated alumina [10], ion exchange resins [11], layered double hydroxide [12] and cellulosic materials [13].…”

Section: Introductionmentioning

confidence: 99%

Bone char modification by iron to improve its capacity for adsorbing fluoride from an aqueous solution

Carrales-Alvarado

Jiménez-López

Leyva‐Ramos

et al. 2023

Sustain Environ Res

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High fluoride concentrations in groundwater have attracted great concern worldwide because many people are afflicted by fluorosis due to water consumption. In this work, the fluoride adsorption from water onto bone char (BC) modified with iron sulfate (BCM) was studied as an option for eliminating fluoride from drinking water. The experimental data for the adsorption equilibrium of fluoride on BCMs were procured in a batch adsorber. The synthesis conditions of BCMs were optimized for improving the adsorption capacity of BCMs, and the optimal BCM was designated as BCM2. The BCMs were characterized by different analytical techniques, the BCMs surface exhibited an irregular morphology and the chemical nature was basic, and the BCMs were mesoporous materials. The Langmuir isotherm satisfactorily interpreted the experimental data of the fluoride adsorption isotherms on BCMs. The basic sites of BC and BCMs were quantified and identified in this work. The main adsorption mechanism of fluoride on the BCMs was the electrostatic attraction between the fluoride and the basic sites of BCMs, and the adsorption capacities of BC and BCMs towards fluoride increased almost linearly with the concentration of basic sites so that the enhancement of the adsorption capacity of BCMs was attributed to the increase of basic sites during the modification. Furthermore, the BCM2 adsorption capacity was lessened by incrementing the pH from 5 to 9, and this behavior was ascribed to the reduction of the electrostatic attraction interactions between the BCM2 surface basic sites and fluoride in the solution. The adsorption process was endothermic because the adsorption capacities of BC and BCM2 toward fluoride were raised by incrementing the solution temperature from 15 to 35 °C. The BCM2 presented a high capacity for adsorbing fluoride of 14.4 mg g−1 at 25 °C and a pH of 5.

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Section: Introductionmentioning

confidence: 99%

Bone char modification by iron to improve its capacity for adsorbing fluoride from an aqueous solution

Carrales-Alvarado

Jiménez-López

Leyva‐Ramos

et al. 2023

Sustain Environ Res

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“…Electrocoagulation (EC) is a technique that has been successfully used to treat wastewater [1][2][3][4][5][6][7][8], groundwater [9][10][11][12][13][14][15], and drinking water [16,17]. The technique uses a reactor fed with electric current to produce hydroxides in situ (generally of iron or aluminum) by the anodic oxidation of these metals in an aqueous medium [18].…”

Section: Introductionmentioning

confidence: 99%

Interelectrode Distance Analysis in the Water Defluoridation by Electrocoagulation Reactor

et al. 2022

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In this research, the effect of the interelectrode distance (d) in the electrocoagulation (EC) reactor was studied. The experiments were carried out with varying d in values of 3, 5, and 9 mm during the treatment of water contaminated with fluoride (F−). The response variables analyzed were the treatment time necessary to reduce the residual concentration of F− to 1.5 mg L−1, the number of aluminum hydroxides formed, the potential drop in the reactor terminals, and the electric power consumption of the reactor. The software FLUENT version 6.3 was employed to simulate the liquid velocity profiles achieved in the reactor chamber. The results obtained show that the liquid velocity increases in the interelectrode spaces to 0.48, 0.65, and 0.86 m s−1 for interelectrode distances of 9, 5, and 3 mm, respectively, which favors not only the formation of flocs but also the elimination of fluoride. With a shorter interelectrode distance, the EC reactor not only consumes less electrical energy but also fewer electrodes, and the dispersion of generated flocs in the reactor chamber is major, which is more important than the quantity of flocs generated in it.

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“…Many research articles have been published to date on the removal of fluoride from water sources (Ruthven, 1984). Adsorbent preparation is a two-step process, firstly synthesis of electrochemically generated adsorbent (EGA) using NaCl as an electrolyte in a reactor, as described in a previous study (Jadhao et al, 2019), and secondly ultrasonification to produce UEGA (Barathi et al, 2014). The electrolytic process is regulated by the sacrificial anode's electrochemical dissociation, which results in the formation of coagulant.…”

Section: Introductionmentioning

confidence: 99%

Chemical and Process Engineering

2022

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Ultrasonically improved electrochemically generated adsorbent (UEGA) has been synthesized and used for adsorption of fluoride ions from fluoride laden waste water. UEGA was prepared in two major steps, firstly electrochemically generated adsorbent (EGA) was prepared using electrolytic method followed by ultrasonication treatment. Ultrasonication causes size reduction which leads to increase in surface area viz. active site which helps to enhance attachment of negatively charged fluoride ion on positively changed UEGA from waste water. UEGA was prepared at three different amplitude i.e. 50, 70 and 90% respectively. Taguchi optimization for defluoridation was carried out considering operating parameters such as initial concentration; contact time; adsorbent dose; and temperature. The results obtained demonstrated that adsorption showed different fluoride removal at varying frequency. This study proved that varying percentage amplitude of ultrasonication significantly affects defluoridation efficiency.

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Optimization of electrocoagulation process for fluoride removal: a blending approach using gypsum plaster rich wastewater

Cited by 12 publications

References 23 publications

Bone char modification by iron to improve its capacity for adsorbing fluoride from an aqueous solution

Bone char modification by iron to improve its capacity for adsorbing fluoride from an aqueous solution

Interelectrode Distance Analysis in the Water Defluoridation by Electrocoagulation Reactor

Chemical and Process Engineering

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