Removal of humic acids by continuous electromagnetic treatment followed by electrocoagulation in batch using aluminium electrodes

Ghernaout, Djamel; Ghernaout, Badia; Saiba, Ali; Boucherit, Ahmed; Kellil, Amara

doi:10.1016/j.desal.2008.04.001

Cited by 120 publications

(52 citation statements)

References 19 publications

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“…The high removal efficiency can be assigned to the double effects of the attracted force between the cationic species of Al 3+ and anionic species of TC and the adsorption of this latter onto Al(OH) 3 , which presents a large surface area. These flocs are active leading to a rapid adsorption of soluble organic compound (and trapping of colloidal particle) and are easily separated from aqueous medium by sedimentation or H 2 flotation [35] The surface complexes of zwitterionic species of TC were previously suggested by Figueroa et al [36] as the major contributor to the adsorption mechanism of a kaolinite, montmorillonite. These results were also reported by Chen et al [37] who studied the adsorption and transformation of TC onto aluminum oxide.…”

Section: Effect Of the Phmentioning

confidence: 99%

Removal of tetracycline by electrocoagulation: Kinetic and isotherm modeling through adsorption

Ouaissa

Chabani

Amrane

et al. 2014

Journal of Environmental Chemical Engineering

108

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The use of antibiotics and growth hormones in human and veterinary medicine has a significant effect on the quality of surface and groundwater. The relevance of an electrocoagulation (EC) process for the removal of an antibiotic selected because of its wide application, high solubility in water, high residual toxicity and an absence of biodegradability, was examined in this study.Metal hydroxides generated during EC were used to remove tetracycline (TC) from aqueous solution. The knowledge regarding the removal mechanism of this substance has not been investigated up to now. Experiments were carried out in a batch electrochemical reactor using aluminum electrodes. The removal of TC was relatively fast and equilibrium was reached within 15 min. The effects of the main operating parameters were examined and showed that irrespective of the initial concentration and for pH ranging from 3 to 10, maximum removal efficiency remained close to 99%; while a sharp decrease was recorded at pH 2 (10 % removal).The results of this study also showed that the removal of TC from water was strongly affected by the current intensity. The mechanism of electrocoagulation was modeled using isotherm models and showed that the Sips isotherm matched satisfactorily experimental data, suggesting monolayer coverage of adsorbed molecules and assumed a quasi-Gaussian distribution energy owing to the high correlation also found for the Toth model. In addition, adsorption kinetic studies showed that the EC process followed a pseudo-second-order kinetic model at the various current densities, pH and initial antibiotic concentrations considered.

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Section: Effect Of the Phmentioning

confidence: 99%

Removal of tetracycline by electrocoagulation: Kinetic and isotherm modeling through adsorption

Ouaissa

Chabani

Amrane

et al. 2014

Journal of Environmental Chemical Engineering

108

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“…However, in 1919 Kramers postulated a mechanism of exchange between metal ions through the intermediary oxygen ions. Néel combined his theory on antiferromagnetism with Kramers ideas on indirect exchange and formulated his new theory for antiferromagnetic oxides and later for ferrites (Kefeni et al, 2017;Lou and Huang, 2009;Yang, 1994;Navratil, 2016;Ali, 2012;Ghernaout et al, 2009;Ghernaout et al, 2010). Later, this theory was put on a mathematical basis and called it super exchange.…”

Section: Antiferromagnetismmentioning

confidence: 99%

Magnetic field generation in the water treatment perspectives: An overview

Ghernaout

2018

Int. j. adv. appl. sci.

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In the last few decades, many researches on the effects of magnetic field (MF) on water have been reported; however, still many arguments and doubts are present. This review aims to focus on the basic properties implied in magnetic phenomena generation at the atomic and electronic level of matter. Fundamentals of magnetism and origin of magnetic effect will be discussed. Both paramagnetism and diamagnetism are very crucial in the examination of atomic and molecular structure; however, these effects are very weak and have no real practical importance. Large scale magnetic effects resulting in commercially important materials appear in atoms and ions of only a few metallic elements notably Fe, Co, Ni, and some of the rare earths. In alloys or oxides of some materials containing these elements and some neighboring ions such as Mn, there is a crucial improvement of the atomic spin effect. This enhancement comes about from the cooperative interaction of large numbers (10 13 -10 14 ) of these atomic spins producing a region where all atomic spins within it are aligned parallel (positive exchange interaction). These materials are called ferromagnetic. In spite of the achieved performances on MF technologies, there is a huge work to be performed for better understanding and controlling of magnetic water treatment.

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“…At present, there are several methods used to remove humic substance, especially humic acid as main component from peat water, such as coagulation-flocculation (Uygunera et al 2007), electro coagulation processes (Ghernaout et al 2009), oxidation (Uygunera et al 2007), photocatalysis (Sonea et al 2010), and membrane technology (Katsoufidou et al 2010). All of these alternative processes, however, are high operational cost, especially when applying membrane technology, because humic acid component tends to severely foul the membrane (Katsoufidou et al 2010) and hence, limiting the membrane application in this field.…”

Section: Introductionmentioning

confidence: 99%

Removal of humic acid from peat water using untreated powdered eggshell as a low cost adsorbent

Zulfikar

Novita²,

Hertadi

et al. 2013

Int. J. Environ. Sci. Technol.

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The main objective of this study is to investigate the possibility of powdered eggshell used as an adsorbent material for removal of humic acid from peat water. The influences of contact time, dose of eggshells, pH, and temperature were the factors considered in the removal processes of humic acid from peat water. In addition, adsorption isotherms of humic acid onto the powdered eggshell were also evaluated with the Langmuir and Freundlich approximations. Our results showed that the equilibrium of the process was eventually established after 60 min of the contact time, and also found that using 5 g of the powdered eggshell nearly 95 % of humic acid has been successfully removed from the peat water. The removal of humic acid gave better result when it was conducted at low pH, and it was almost unaffected the temperatures variation. The data was well fitted to Freundlich isotherm with the correlation coefficient of not \0.999, and could uptake the humic acid about 126.58 mg/g at pH 4.01, estimated from the Langmuir model. The kinetic experimental data proportionally correlated with the pseudo-second-order kinetic model with a rate constant in the range of 0.016-0.112 g mg -1 min -1 , while intra-particle-diffusion were the main rate determining step in the humic acid removal process. The powdered eggshell investigated in this study, thus, exhibited as a high potential adsorbent for the removal of humic acid from peat water.

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Removal of humic acids by continuous electromagnetic treatment followed by electrocoagulation in batch using aluminium electrodes

Cited by 120 publications

References 19 publications

Removal of tetracycline by electrocoagulation: Kinetic and isotherm modeling through adsorption

Removal of tetracycline by electrocoagulation: Kinetic and isotherm modeling through adsorption

Magnetic field generation in the water treatment perspectives: An overview

Removal of humic acid from peat water using untreated powdered eggshell as a low cost adsorbent

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