scholarly journals Valorization of granulated slag of Arcelor-Mittal (Algeria) in cationic dye adsorption from aqueous solution: column studies

2015 ◽  
Vol 6 (1) ◽  
pp. 204-213
Author(s):  
Radia Mazouz ◽  
Naima Filali ◽  
Zhour Hattab ◽  
Kamel Guerfi
Keyword(s):  
Aqueous Solution ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Characteristic Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Granulated Slag ◽  
Good Agreement

A continuous adsorption study in a fixed-bed column was carried out using granulated slag (GS) as an adsorbent for the removal of methylene blue (MB) from aqueous solution. The effects of various parameters, such as initial dye concentration, flow rate, bed depth, and pH were investigated. Obtained results confirmed that the breakthrough time and exhaustion time were dependent on these factors. The adsorption capacity of GS was calculated at the 50% breakthrough point for different conditions. The highest breakthrough capacity (q,exp = 0.296 mg.g–1) was obtained with a 15 cm bed height and a 2 mL.min–1 rate by using a 10 mg.L–1 initial MB concentration at pH 7.5. Bohart–Adams, Bed Depth Service Time (BDST), and Thomas models were applied to experimental data to determine the characteristic parameters of the column. The Thomas model was found suitable for the description of the whole breakthrough curve, while the Bohart–Adams model was only used to predict the initial part of the dynamic process. The data were in good agreement with the BDST model. Thus, the granulated slag can be used as an adsorbent in the treatment of wastewater. Desorption was carried out with a deionized water as the desorbing agent, and reuse study was investigated.

scholarly journals Removal of Cr (VI) from aqueous solution by activated charcoal derived from Sapindus trifoliate L fruit biomass using continuous fixed bed column studies

2021 ◽  
Author(s):  
Samir Mohanta ◽  
Monaj Kumar Sahu ◽  
Prakash Chandra Mishra ◽  
Anil Kumar Giri
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Activated Charcoal ◽  
Fixed Bed ◽  
Maximum Adsorption Capacity ◽  
Thomas Model ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Bed Height

Abstract In this study, the removal of hexavalent chromium from aqueous solution were examined using activated charcoal derived from Sapindus trifoliate L fruit biomass in continuous fixed-bed column studies. The activated S. trifoliate L fruit charcoal was prepared by treating the fruit powder using concentrated nitric acid solution. Experiments were performed to investigate the effect of bed-height and initial concentration on the breakthrough and saturation times. The breakthrough and saturation time increases with increase in bed-height and initial concentration of chromium solutions. The maximum adsorption capacity of S. trifoliate L charcoal for hexavalent chromium was found to be 1.719 mg/g in the bed height 15 cm and initial concentration 10 mg/L, respectively. Column data required at various conditions were explained using Bohart-Adams and Thomas model. Two models were found to be suitable to describe the definite part of the dynamic behaviour of the column with regard to bed-height and initial concentration of hexavalent chromium. On comparison of Adjusted R2 and estimated standard error, the Thomas model was found to best-fitted model and can be used to predict the adsorption of the hexavalent chromium in fixed-bed column studies. Activated Sapindus trifoliate L fruit charcoal was characterised by SEM – EDX and FTIR analysis.

Investigations on the Fixed-Bed Column Performance of Acid Brown 75 Adsorption by Surface Modified Fly Ash Granules

2014 ◽  
Vol 931-932 ◽  
pp. 241-245
Author(s):  
Chayada Pansuk ◽  
Soydoa Vinitnantharat
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Characteristic Parameters ◽  
Feed Concentration ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Lignite Fly Ash ◽  
Surface Modified

Adsorption potential of surface modified granule (SM-G) to remove acid brown 75 (AB 75) from aqueous solution was investigated using fixed-bed column mode. To produce SMG, lignite fly ash was agglomerated into porous granules by an extruder at 800°C and surfacemodified with a cationic surfactant, Hexadecyltrimetylammonium Bromide (HDTMABr). The performance of the fixed-bed column was evaluated to assess the effect of various process variables, viz., of bed height, flow rate and initial feed concentration on breakthrough time and adsorption capacity. The bed depth service time (BDST) model was applied to the data for predicting breakthrough curves and to determine the characteristic parameters. The highest experimental and theoretical bed capacities were obtained to be 55.3 mg of AB 75 adsorbed per gram of SM-G. The results indicated that the SM-G is a suitable adsorbent for the removal of AB 75 from aqueous solution.

scholarly journals Continuous Fixed-Bed Column Studies on Congo Red Dye Adsorption-Desorption Using Free and Immobilized Nelumbo nucifera Leaf Adsorbent

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 54
Author(s):  
Vairavel Parimelazhagan ◽  
Gautham Jeppu ◽  
Nakul Rampal
Keyword(s):  
Congo Red ◽  
Agricultural Waste ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Nelumbo Nucifera ◽  
Substantial Contribution ◽  
Flow Mode ◽  
Waste Biomass ◽  
Column Studies ◽  
Fixed Bed Column

The adsorption of Congo red (CR), an azo dye, from aqueous solution using free and immobilized agricultural waste biomass of Nelumbo nucifera (lotus) has been studied separately in a continuous fixed-bed column operation. The N. nucifera leaf powder adsorbent was immobilized in various polymeric matrices and the maximum decolorization efficiency (83.64%) of CR occurred using the polymeric matrix sodium silicate. The maximum efficacy (72.87%) of CR dye desorption was obtained using the solvent methanol. Reusability studies of free and immobilized adsorbents for the decolorization of CR dye were carried out separately in three runs in continuous mode. The % color removal and equilibrium dye uptake of the regenerated free and immobilized adsorbents decreased significantly after the first cycle. The decolorization efficiencies of CR dye adsorption were 53.66% and 43.33%; equilibrium dye uptakes were 1.179 mg g–1 and 0.783 mg g–1 in the third run of operation with free and immobilized adsorbent, respectively. The column experimental data fit very well to the Thomas and Yoon–Nelson models for the free and immobilized adsorbent with coefficients of correlation R2 ≥ 0.976 in various runs. The study concludes that free and immobilized N. nucifera can be efficiently used for the removal of CR from synthetic and industrial wastewater in a continuous flow mode. It makes a substantial contribution to the development of new biomass materials for monitoring and remediation of toxic dye-contaminated water resources.

scholarly journals Fixed bed column performance of tinospora cordifolia for defluoridation of water

2021 ◽  
Author(s):  
Meena Chakraborty ◽  
Madhurima Pandey ◽  
Piyushkant Pandey
Keyword(s):  
Large Scale ◽  
Packed Column ◽  
Fluoride Concentration ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Tinospora Cordifolia ◽  
Characteristic Parameters ◽  
Fixed Bed Column ◽  
Continuous Adsorption ◽  
Defluoridation Of Water

Abstract A continuous adsorption study in a fixed-bed column was carried out by using Tinospora cordifolia as an adsorbent for the removal of fluoride from aqueous solution. The effect of flow rate, influent fluoride concentration and bed depth on the adsorption characteristics of adsorbent was investigated at pH 7. The dependencies of breakthrough curves on these parameters were confirmed from the data obtained. Modeling of data was done. Thomas, Yoon–Nelson and Adams–Bohart models were applied to experimental data to predict the breakthrough curves. These kinetic models were helpful to determine the characteristic parameters of column designing for defluoridation on a large scale. Thomas and Yoon-Nelson models were found to be more suitable for the description of the breakthrough curve than the Adams–Bohart model in the present study. It was concluded that the Tinospora cordifolia-packed column can be used for effective defluoridation of water.

scholarly journals FIXED-BED ADSORPTION OF AQUEOUS VANILLIN ONTO RESIN H103

2017 ◽  
Vol 18 (2) ◽  
pp. 94-104
Author(s):  
Rozaimi Abu Samah
Keyword(s):  
Aqueous Solution ◽  
Flow Rate ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Maximum Adsorption Capacity ◽  
Feed Flow Rate ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Bed Height ◽  
Fixed Bed Adsorption

The main objective of this work was to design and model fixed bed adsorption column for the adsorption of vanillin from aqueous solution. Three parameters were evaluated for identifying the performance of vanillin adsorption in fixed-bed mode, which were bed height, vanillin initial concentration, and feed flow rate. The maximum adsorption capacity was increased more than threefold to 314.96 mg vanillin/g resin when the bed height was increased from 5 cm to 15 cm. Bohart-Adams model and Belter equation were used for designing fixed-bed column and predicting the performance of the adsorption process. A high value of determination coefficient (R2) of 0.9672 was obtained for the modelling of vanillin adsorption onto resin H103.

scholarly journals Improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets in batch and fixed-bed column studies

2019 ◽  
Vol 19 (7) ◽  
pp. 1929-1937 ◽  
Author(s):  
Nguyen Chi Thanh ◽  
Boonchai Wichitsathian ◽  
Chatpet Yossapol ◽  
Watcharapol Wonglertarak ◽  
Borano Te
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Removal Rate ◽  
Fixed Bed ◽  
Polluted Water ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Phosphate Ions ◽  
Pseudo Second Order ◽  
Clay Pellets

Abstract Arsenic-polluted water is a global concern and puts millions of people at risk of developing cancer. The improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets was investigated in batch and fixed-bed column systems. Batch studies showed that the removal rate occurred in two main phases with an equilibrium time of 52 h. The pseudo-second-order model well described the experimental data. Isotherm data were well fitted by the Langmuir–Freundlich model. The removal efficiency was significantly reduced in alkaline solution and the presence of phosphate ions. The column study revealed that the breakthrough time and saturation time increased with lower feeding flow rate, higher bed height, and lower initial adsorbate concentration. The Thomas model provided good performance for predicting the column experimental data.

Continuous biosorption of nickel from aqueous solution using Chrysanthemum indicum derived biochar in a fixed-bed column

2017 ◽  
Vol 76 (7) ◽  
pp. 1895-1906 ◽  
Author(s):  
Sowmya Vilvanathan ◽  
S. Shanthakumar
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Column Studies ◽  
Nickel Ion ◽  
Fixed Bed Column ◽  
Nickel Ions ◽  
Chrysanthemum Indicum

The biosorption capability of Chrysanthemum indicum to remove nickel ions from aqueous solution in a fixed-bed column was examined in this study. Native C. indicum flower waste was improved for its biosorptive potential by pyrolysis to obtain its biochar form and, thereby, both raw (CIF-R) and biochar (CIF-BC) forms of the flower were used for Ni(II) removal. Fixed bed column studies were conducted to examine the influence of bed height (1.0–3.0 cm), flow rate (1.0–5.0 mL min−1) and initial metal ion concentration (25–75 mg L−1). The breakthrough curves (Cout/Cin vs time) were modelled using different dynamic adsorption models, viz. Adams-Bohart, Thomas and Yoon-Nelson model. Interpretation of the data revealed a favorable correlation with the Thomas model with higher R2 values and closer model-predicted and experimental biosorption capacity values. The equilibrium uptake capacity of CIF-R and CIF-BC for Ni(II) were found to be 14.02 and 29.44 mg g−1, respectively. Further, the column was regenerated using HCl as eluent, to desorb the adsorbed Ni(II) ions. The experimental results implied and affirmed the suitability of the biosorbents for nickel ion biosorption with its nature being favorable, efficient, and environmentally friendly.

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