Enhancement of mass transfer in the fluidized bed electrode reactors

Hwang, Young-Gi; Chun, Honggu

doi:10.1007/bf02698363

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Improvement of mass transfer in these electrodes has been studied by several researchers (Hwang and Chun 1999;Shvab et al 2000a, b). Mass transport phenomenon in three-dimensional electrodes is influenced by reactor configuration and hydrodynamics involving fluid superficial velocity, bed porosity, bed height and particles diameter (Pak et al 2001;Shirvanian et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Improvement of cadmium ion electrochemical removal from dilute aqueous solutions by application of multi-stage electrolysis

Baghban

Mehrabani-Zeinabad

Moheb

2014

Int. J. Environ. Sci. Technol.

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Improvement of cadmium ion electrochemical removal from dilute aqueous solutions in a spouted bed reactor was investigated. Enlargement of cathode surface area from 1,000 to 1,500 cm 2 resulted in a decrease of nearly 30 % in both of the process time and the specific energy consumption. Application of a three-stage electrolysis process for a solution containing initial concentration of 270 ppm cadmium ion, resulted in the removal of 99.9 % cadmium ion in 135 min with the specific energy consumption of 2.29 kWh/kg, 23 % less than the value of a single-stage process. For a solution with cadmium ion initial concentration of 180 ppm, 99.9 % of cadmium ion was removed in 135.5 min by application of a two-stage electrolysis process, while the specific energy consumption was 2.82 kWh/kg, 30 % less than that of a single-stage process. For a solution with cadmium ion initial concentration of 90 ppm, 99.5 % of cadmium ion was removed in 100.2 min with the specific energy consumption of 3.78 kWh/kg in a single-stage electrolysis process.

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Section: Introductionmentioning

confidence: 99%

Improvement of cadmium ion electrochemical removal from dilute aqueous solutions by application of multi-stage electrolysis

Baghban

Mehrabani-Zeinabad

Moheb

2014

Int. J. Environ. Sci. Technol.

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“…The SiC/C composites showed good oxidation resistance up to 830 • C. The effective mixing ratio of PCS/phenolic resin to prepare improved mechanical property was 2/1. Literature such as Park et al (1996), Sun et al (1998), Jeon and Yoo (1998), Lim et al (1999), Hwang and Chun (1999), Lee et al (1999), Cho et al (2007), Pattamarat and Hunsom (2008), Kim et al (2008), Joo et al (2008), Jeong et al (2008), andCho et al (2008) reported development and applications of electrodes.…”

Section: Introductionmentioning

confidence: 99%

Influence of carbonisation on selected engineering properties of carbon resin electrodes for electrochemical treatment of wastewater

Oke

2009

Can J Chem Eng

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In this study, effects of selected factors on selected properties of carbon resin electrodes (CRE) have been investigated. CRE were developed from used dry cells and resin using non-heat-treatment process. Selected properties (density, electrical resistance, microstructure, hygroscopy, stability moisture content, compressive and flexural strength) of the electrodes were monitored and effects of carbonisation temperature, carbon particle size, and compaction pressure on these properties were studied.The study revealed that the density of CRE was in the range of 1.33 to 1.59 g/cm 3 , compressive strength ranged from 36.56 to 43.81 MN/m 2 , flexural strength, moisture content, and swelling were in the range of 6.76 to 8.10 MN/m 2 , 0.84-0.93%, and 6.04-9.30%, respectively. In all cases electrical resistance and density of CRE decreased with increasing carbonisation temperature at various operational factors (particle size, compacting pressure, and percentage of the resin used). Also, it was revealed that carbonisation of CRE from 30 to 220 • C reduced specific electrical resistance and density from 1.85 to 1.29 × 10 −1 /cm and from 1.35 to 1.24 g/cm 3 , respectively, but carbonisation temperature had no significant effect on wetness, compressive and flexural strength, stability, and moisture content of the electrodes. Estimated costs revealed that cost of producing CRE was cheaper ($13.25/m) than that of heat-treated electrodes ($33.33/m).It was concluded that carbonisation temperature, particle size, compacting pressure, and percentage of the resin used are important factors in the development of CRE with lower specific electrical resistance.Dans la présenteétude, on a examiné les effets de facteurs choisis sur des propriétés choisies d'électrodes de résine de carbone (ERC). On a mis au point ces dernièresà partir de piles sèches usées et de résine au moyen d'un procédé sans traitement thermique. On a observé les propriétés sélectionnées (densité, résistanceélectrique, microstructure, hygrométrie, stabilité, teneur en humidité, résistanceà la compression et résistanceà la flexion) desélectrodes et on a examiné les effets de la température de carbonisation, la taille des particules de carbone et la pression de compactage sur ces propriétés. L'étude a révélé que la densité des ERC se situait dans la plage de 1,33 g/cm 3à 1,59 g/cm 3 , la pression de compactage variait de 36,56à 43,81 MN/m 2 et la résistanceà la flexion, la teneur en humidité et le gonflement variaient de 6,76à 8,10 MN/m 2 , 0,84à 0,93% et 6,04à 9,30% respectivement. Dans tous les cas, la résistanceélectrique et la densité des ERC diminuaient avec l'augmentation de la température de carbonisationà divers facteurs opérationnels (taille des particules, pression de compactage et pourcentage de résine utilisé). On aégalement noté que la carbonisation des ERC de 30à 220 • C réduisait la résistanceélectrique et la densité spécifiques de 1,85à 1,29 × 10 −1 /cm et de 1,35 g/cm 3à 1,24 g/cm 3 respectivement, mais la température de carbonisation n'a eu aucun ef...

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Removal of tin from dilute solutions

Chaudhary

Dando

Grimes

2001

J. Chem. Technol. Biotechnol.

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The¯uidised bed cell of inert glass beads is an electrolytic reactor which is designed to provide higher ion-transfer conditions during electrolysis, thus enabling metals to be removed ef®ciently from dilute solutions. The effectiveness of the method as a means of removing metals from ef¯uent to meet discharge consent levels is studied for the in situ removal of tin from dilute solution (concentration range 0.25±1.00 gdm À3 ). The results show that the combination of high mass transport conditions and a moderately high electrode surface area per unit electrode volume provides a system for continuous removal of metal from dilute solutions. The effects of acid concentration, tin concentration, current density,¯uidised bed agitation, electrode spacing, type of electrode and lead impurities on the removal of tin are reported and expressed in terms of the percentage removal of tin (a Sn ), the ef®ciency of tin deposition (f Sn ), and the energy consumption (W Sn ) for 1 kg of tin deposited. The results show that tin can, under optimised conditions, be removed from dilute solutions to a residual concentration of 0.001 gdm À3 .

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Enhancement of mass transfer in the fluidized bed electrode reactors

Cited by 6 publications

References 10 publications

Improvement of cadmium ion electrochemical removal from dilute aqueous solutions by application of multi-stage electrolysis

Improvement of cadmium ion electrochemical removal from dilute aqueous solutions by application of multi-stage electrolysis

Influence of carbonisation on selected engineering properties of carbon resin electrodes for electrochemical treatment of wastewater

Removal of tin from dilute solutions

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