Electroflotation of metal ions in waste water

Alexandrova, L.; Nedialkova, T.; Nishkov, I.

doi:10.1016/0301-7516(94)90034-5

Cited by 30 publications

(24 citation statements)

References 6 publications

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“…[3], [4], and [8]) to turbulent fluid flow in our cavitation tube, it is necessary to introduce the following turbulent kinetic energy and turbulent dissipation rate equations:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Flotation of ions and precipitates has been used to remove toxic species and recover metals from industrial effluents. [1][2][3][4][5][6][7] Paper recycling is a growing practice in which flotation is the preferred technology for ink removal. [8] A low flotation rate of fine particles is encountered in many of these applications, which can be attributed to low particle inertia.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of a hydrodynamic cavitation tube

Finch

Zhou

et al. 1998

Metall Mater Trans B

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A numerical analysis of hydrodynamics in a cavitation tube used for activating fine particle flotation is described. Using numerical procedures developed for solving the turbulent k-ε model with boundary fitted coordinates, the stream function, vorticity, velocity, and pressure distributions in a cavitation tube were calculated. The calculated pressure distribution was found to be in excellent agreement with experimental results. The requirement of a pressure drop below approximately 10 m water for cavitation to occur was observed experimentally and confirmed by the model. The use of the numerical procedures for cavitation tube design is discussed briefly.

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“…[3], [4], and [8]) to turbulent fluid flow in our cavitation tube, it is necessary to introduce the following turbulent kinetic energy and turbulent dissipation rate equations:…”

Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of a hydrodynamic cavitation tube

Finch

Zhou

et al. 1998

Metall Mater Trans B

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“…Nearly 99% of suspended solids were removed from surface water by adopting a three-stage process comprising electrocoagulation, flotation and micro-filtration. 2 Electrocoagulation and flotation techniques were reported for the separation of oil from emulsions, 3 the purification of urban and restaurant wastewater, 4 and textile wastewater, 5 the removal of latex particles, 6 metal ions 7 and sulfur species 8 from aqueous suspensions and for the treatment of industrial liquid waste. 9 Szpyrkowicz et al have suggested the use of Ti/Pt/Ir as anode for the removal of nitrogen from industrial wastewater.…”

Section: Introductionmentioning

confidence: 99%

Removal of tannins and polyhydroxy phenols by electro‐chemical techniques

Murugananthan

Raju

Prabhakar

2005

J of Chemical Tech & Biotech

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The removal of tannins and their basic molecules such as catechol, pyrogallol, phloroglucinol and resorcinol was studied by electro-flotation and electro-oxidation techniques. Iron rods and triple oxide (TaO 2 /RuO 2 /IrO 2 ) coated titanium rods were used as electrodes for electro-flotation and electrooxidation respectively. Interaction of tannins and polyhydroxy phenols with iron oxy-hydroxide formed by anodic dissolution of iron was studied by UV-Visible, FT-IR and zeta-potential measurements. GC-MS was used to identify the intermediate compounds formed during electro-oxidation. Catechol, pyrogallol, phloroglucinol and resorcinol were found to be mineralized in the presence of triple oxide (TaO 2 /RuO 2 /IrO 2 ) coated titanium electrodes. Catechol and pyrogallol were found to form insoluble organo-metal complexes while resorcinol and phloroglucinol were found to adsorb on iron oxy-hydroxide. The sludge thus formed was simultaneously separated from the aqueous phase by hydrogen bubbles. It was observed that the power consumption is relatively high for electro-oxidation compared with electroflotation. The effects of pH and reaction time on their removal were also studied and the results are discussed.

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“…Le traitement physicochimique conventionnel des effluents textiles par coagulation/ précipitation est souvent incapable de séparer les colloïdes à faible densité. La technique utilisant l'électroflottation (EF) présente une alternative très intéressante et compétitive par rapport aux systèmes traditionnels de séparation solide-liquide et de décontamination des eaux usées (ALEXANDROVA et al, 1994;ARAYA-FARIAS et al, 2008;BEN MANSOUR et al, 2007CALVIN, 1997;CASQUEIRA et al, 2006;KETKAR et al, 1991;KHELIFA et al, 2005;HOSNY, 1992HOSNY, et 1996MERZOUK et al, 2008;MURUGANANTHAN et al, 2004;OUSSEDIK et KHELIFA, 2001). L'objectif de ce travail consiste en la décoloration d'une eau résiduaire textile réelle contenant des colorants appartenant au groupe des plus récalcitrants (les colorants réactifs) par coagulation/électroflottation.…”

Section: Introductionunclassified

Traitement combiné d’un effluent textile contenant des colorants réactifs par coagulation-floculation et électroflottation

Bouyakoub

Kacha

Ouhib

et al. 2010

rseau

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Les effluents textiles contenant des colorants réactifs sont souvent très complexes et nécessitent des traitements intensifs. De nos jours, la combinaison de deux ou plusieurs techniques opératoires, en se servant des progrès scientifiques permettant une bonne commande du procédé, est devenue une alternative intéressante. Par ailleurs, les argiles et les minéraux argileux, du fait d’avoir des propriétés leur permettant d’être à la fois adsorbants et adjuvants de floculation, attirent un intérêt particulier des chercheurs dans le domaine du traitement des effluents industriels. Dans cette étude, un effluent textile qui représente les eaux résiduaires de l’unité de teinture du coton Denitex, Tlemcen en Algérie, a été traité par un procédé combiné. Le traitement comporte deux étapes : la première est une coagulation-floculation (CF) à l’aide des sels d’aluminium pré-neutralisés jusqu’à un rapport OH/Al égal à 2,25, donnant naissance au polycation de structure AlO4Al12(OH)24(H2O)12, appelé aussi Al13, en association avec une bentonite algérienne (B). Dans la deuxième étape, qui succède à la première, l’électroflottation (EF) a été utilisée pour exploiter son rôle de séparation solide-liquide, et aussi pour améliorer l’efficacité du traitement. Dans les deux techniques utilisées : (CF) et (EF), les conditions opératoires, telles que le pH, la concentration des réactifs, le temps de contact, d’une part, et aussi la densité du courant électrique et la consommation d’énergie, d’autre part, ont été déterminées. Les résultats obtenus indiquent que l’effluent traité par cette méthode ne contient pratiquement plus de couleur ni de DCO : 99,71 % et 99,07 % d’élimination sont obtenus, respectivement.Textile effluents containing reactive dyes are often very complex and require intensive treatments. Nowadays, the combination of two or more techniques has become an interesting alternative, because of scientific progress allowing for a good control of the processes. Clays and clay minerals, because of their properties enabling them to be simultaneous adsorbents and flocculation additives, are of particular interest to researchers in industrial wastewater treatment. In this study, a textile effluent that represents the wastewater of a cotton dyeing plant (Denitex, Tlemcen, Algeria) was treated by a combined process. The treatment was divided into two stages: the first was a coagulation-flocculation (CF) stage using pre-neutralized aluminium salts, called Al13 polycations (AlO4Al12(OH)24(H2O)12), as a coagulant associated with an Algerian bentonite (B); in the second stage, an electroflotation technique (EF) was used. The EF technique was not only used as a solid-liquid separation operation, but also in the improvement of the effectiveness of the treatment. For the CF and EF treatments of wastewater, the effects of pH, reagent concentrations, contact times as well as electric current and energy consumption were investigated. The effluent treated by this combined method contained essentially no colour or COD: 99.7% and 99.1% eliminat...

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Electroflotation of metal ions in waste water

Cited by 30 publications

References 6 publications

Numerical and experimental study of a hydrodynamic cavitation tube

Numerical and experimental study of a hydrodynamic cavitation tube

Removal of tannins and polyhydroxy phenols by electro‐chemical techniques

Traitement combiné d’un effluent textile contenant des colorants réactifs par coagulation-floculation et électroflottation

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