scholarly journals Fixed Bed Adsorption Study on Phosphate Removal Using Nanosized FeOOH-Modified Anion Resin

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Nan Li ◽  
Jing Ren ◽  
Lin Zhao ◽  
Zhong-liang Wang
Keyword(s):  
Flow Rate ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Fixed Bed Column ◽  
Anion Resin ◽  
Bed Height ◽  
Fixed Bed Adsorption ◽  
The Relationship

Removal of phosphate from solution using nanosized FeOOH-modified anion resin was studied in fixed bed column. Effect of bed height and flow rate on the breakthrough curves were investigated. Longer breakthrough time was obtained by increasing the bed height and decreasing the flow rate. Bed service depth time (BDST) model was applied to recount the relationship between bed service time and bed height. The value ofN0was calculated to be 21.4 g/L. Yoon-Nelson model, which fitted well with the experimental data, is allowable to estimate the breakthrough curves and characteristic parameters for phosphate adsorption in the column filled with nanosized FeOOH-modified anion resin.

scholarly journals Sorption of Ag+ and Cu2+ by Vermiculite in a Fixed-Bed Column: Design, Process Optimization and Dynamics Investigations

2018 ◽  
Vol 8 (11) ◽  
pp. 2221 ◽  
Author(s):  
Olga Długosz ◽  
Marcin Banach
Keyword(s):  
Flow Rate ◽  
Continuous Process ◽  
Fixed Bed ◽  
Copper Ion ◽  
Cost Effective ◽  
Breakthrough Curves ◽  
Fixed Bed Column ◽  
Column System ◽  
Total Percentage ◽  
Bed Height

Vermiculite has been used for the removal of Cu 2 + and Ag + from aqueous solutions in a fixed-bed column system. The effects of initial silver and copper ion concentrations, flow rate, and bed height of the adsorbent in a fixed-bed column system were investigated. Statistical analysis confirmed that breakthrough curves depended on all three factors. The highest inlet metal cation concentration (5000 mg/dm3), the lowest bed height (3 cm) and the lowest flow rate (2 and 3 cm3/min for Ag + and Cu 2 + , respectively) were optimal for the adsorption process. The maximum total percentage of metal ions removed was 60.4% and 68.7% for Ag+ and Cu2+, respectively. Adsorption data were fitted with four fixed-bed adsorption models, namely Clark, Bohart–Adams, Yoon–Nelson and Thomas models, to predict breakthrough curves and to determine the characteristic column parameters. The adsorbent was characterized by SEM, FTIR, EDS and BET techniques. The results showed that vermiculite could be applied as a cost-effective sorbent for the removal of Cu 2 + and Ag + from wastewater in a continuous process.

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 Adsorption of Sb(III) from Aqueous Solution by nZVI/AC: A Magnetic Fixed-Bed Column Study

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1912
Author(s):  
Huijie Zhu ◽  
Qiang Huang ◽  
Mingyan Shi ◽  
Shuai Fu ◽  
Xiuji Zhang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Fixed Bed ◽  
Feed Solution ◽  
Breakthrough Curves ◽  
Contaminated Water ◽  
Solution Ph ◽  
Fixed Bed Column ◽  
Ph Values ◽  
Bed Height ◽  
Bed Capacity

The effectiveness of nanoscale zero-valent iron(nZVI) immobilized on activated carbon (nZVI/AC) in removing antimonite (Sb(III)) from simulated contaminated water was investigated with and without a magnetic fix-bed column reactor. The experiments were all conducted in fixed-bed columns. A weak magnetic field (WMF) was proposed to increase the exclusion of paramagnetic Sb(III) ions by nZVI/AC. The Sb(III) adsorption to the nZVI and AC surfaces, as well as the transformation of Sb(III) to Sb(V) by them, were both increased by using a WMF in nZVI/AC. The increased sequestration of Sb(III) by nZVI/AC in the presence of WMF was followed by faster nZVI corrosion and dissolution. Experiments were conducted as a function of the pH of the feed solution (pH 5.0–9.0), liquid flow rate (5–15 mL·min−1), starting Sb(III) concentration (0.5–1.5 mg·L−1), bed height nZVI/AC (10–40 cm), and starting Sb(III) concentration (0.5–1.5 mg·L−1). By analyzing the breakthrough curves generated by different flow rates, different pH values, different inlet Sb(III) concentrations, and different bed heights, the adsorbed amounts, equilibrium nZVI uptakes, and total Sb(III) removal percentage were calculated in relation to effluent volumes. At pH 5.0, the longest nZVI breakthrough time and maximal Sb(III) adsorption were achieved. The findings revealed that the column performed effectively at the lowest flow rate. With increasing bed height, column bed capacity and exhaustion time increased as well. Increasing the Sb(III) initial concentration from 0.5 to 1.5 mg·L−1 resulted in the rise of adsorption bed capacity from 3.45 to 6.33 mg·g−1.

Continuous fixed bed adsorption of Cu(II) by halloysite nanotube–alginate hybrid beads: an experimental and modelling study

2014 ◽  
Vol 70 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Yanyan Wang ◽  
Xiang Zhang ◽  
Qiuru Wang ◽  
Bing Zhang ◽  
Jindun Liu
Keyword(s):  
Adsorption Capacity ◽  
Flow Rate ◽  
Fixed Bed ◽  
Halloysite Nanotubes ◽  
Fixed Bed Column ◽  
Factors Affecting ◽  
Bed Height ◽  
Column Adsorption ◽  
Fixed Bed Adsorption ◽  
Adsorption Desorption

We used natural resources of halloysite nanotubes and alginate to prepare a novel porous adsorption material of organic–inorganic hybrid beads. The adsorption behaviour of Cu(II) onto the hybrid beads was examined by a continuous fixed bed column adsorption experiment. Meanwhile, the factors affecting the adsorption capacity such as bed height, influent concentration and flow rate were investigated. The adsorption capacity (Q0) reached 74.13 mg/g when the initial inlet concentration was 100 mg/L with a bed height of 12 cm and flow rate of 3 ml/min. The Thomas model and bed-depth service time fitted well with the experimental data. In the regeneration experiment, the hybrid beads retained high adsorption capacity after three adsorption–desorption cycles. Over the whole study, the new hybrid beads showed excellent adsorption and regeneration properties as well as favourable stability.

scholarly journals Competitive Fixed-Bed Adsorption of Pb(II), Cu(II), and Ni(II) from Aqueous Solution Using Chitosan-Coated Bentonite

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Wan-Chi Tsai ◽  
Mark Daniel G. de Luna ◽  
Hanna Lee P. Bermillo-Arriesgado ◽  
Cybelle M. Futalan ◽  
James I. Colades ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Flow Rate ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Operational Parameters ◽  
Initial Concentration ◽  
Bed Height ◽  
Fixed Bed Adsorption ◽  
Ternary Metal

Fixed-bed adsorption studies using chitosan-coated bentonite (CCB) as adsorbent media were investigated for the simultaneous adsorption of Pb(II), Cu(II), and Ni(II) from a multimetal system. The effects of operational parameters such as bed height, flow rate, and initial concentration on the length of mass transfer zone, breakthrough time, exhaustion time, and adsorption capacity at breakthrough were evaluated. With increasing bed height and decreasing flow rate and initial concentration, the breakthrough and exhaustion time were observed to favorably increase. Moreover, the adsorption capacity at breakthrough was observed to increase with decreasing initial concentration and flow rate and increasing bed height. The maximum adsorption capacity at breakthrough of 13.49 mg/g for Pb(II), 12.14 mg/g for Cu(II), and 10.29 mg/g for Ni(II) was attained at an initial influent concentration of 200 mg/L, bed height of 2.0 cm, and flow rate of 0.4 mL/min. Adsorption data were fitted with Adams-Bohart, Thomas, and Yoon-Nelson models. Experimental breakthrough curves were observed to be in good agreement (R2>0.85andE%<50%) with the predicted curves generated by the kinetic models. This study demonstrates the effectiveness of CCB in the removal of Pb(II), Cu(II), and Ni(II) from a ternary metal solution.

Removal of Cesium from Aqueous Solution Using PAN-Based Ferrocyanide Composite Spheres: Adsorption on a Fixed-Bed Column

2014 ◽  
Vol 496-500 ◽  
pp. 259-263 ◽  
Author(s):  
Zhi Hui Du ◽  
Ming Chun Jia ◽  
Jin Feng Men
Keyword(s):  
Flow Rate ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Model Parameters ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Column ◽  
Composite Adsorbents ◽  
Bed Height ◽  
Cobalt Hexacyanoferrates ◽  
Good Agreement

Two spherical composite adsorbents namely polyacrylonitrilepotassium cobalt hexacyanoferrates (PAN-KCoCF) and polyacrylonitrilepotassium nickel hexacyanoferrates (PAN-KNiCF) were synthesized. The effects of liquid flow rate, bed height and presence of other cations on the adsorption of cesium were investigated by conducting fixed-bed columns. The results showed that the column performed well at lowest flow rate for PAN-KNiCF. Flow rate examined had little influence on the adsorption of PAN-KCoCF. The breakthrough time decreased with decreasing bed height for both PAN-KCoCF and PAN-KNiCF. In addition, the existence of K+, Na+, NH4+, Ca2+and Mg2+in solution caused a reduction of maximum adsorption capacity for both of the composites. The bed depth service time (BDST) model and the Thomas model were used to analyze the experimental data and the model parameters were evaluated. Good agreement of the experimental breakthrough curves with the model predictions was observed.

scholarly journals Fixed-Bed Column Studies for the Removal of Congo Red Using Simmondsia chinesis (Jojoba) and Coated with Chitosan

2018 ◽  
Vol 18 (2) ◽  
pp. 294 ◽  
Author(s):  
Amina Abdel Meguid Attia ◽  
Mona Abdel Hamid Shouman ◽  
Soheir Abdel Atty Khedr ◽  
Nevin Ahmed Hassan
Keyword(s):  
Flow Rate ◽  
Congo Red ◽  
Dye Removal ◽  
Fixed Bed ◽  
Great Influence ◽  
Breakthrough Curves ◽  
Fundamental Aspect ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Bed Height

The goal of this article describes the potential of utilizing jojoba leaves and also modified with chitosan as an efficient adsorption materials for Congo red dye removal in a fixed-bed column. Inlet dye concentration, feed flow rate and bed height had a great influence on determining the breakthrough curves. The percentage dye removal was found to be approximately 69% of coated jojoba leaves with flow rate 3 mL/min, initial concentration 50 mg/L and 4 cm bed height. The dye uptake capacity at equilibrium (qe) for coated jojoba leaves showed higher values than that found for jojoba leaves. On this basis, this implies that the amino groups played an important role during the adsorption process. Breakthrough curves were satisfactorily in good agreement with both Thomas and Yoon-Nelson models based on the values of correlation coefficient (R2 ≥ 96).This study serves as a good fundamental aspect of wastewater purification on jojoba leaves as a novel adsorbent for the uptake of Congo red dyes from aqueous solution in a column system.

scholarly journals Fixed-Bed Column Technique for the Removal of Phosphate from Water Using Leftover Coal

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5466
Author(s):  
Dereje Tadesse Mekonnen ◽  
Esayas Alemayehu ◽  
Bernd Lennartz
Keyword(s):  
Flow Rate ◽  
Breakthrough Curve ◽  
Nutrient Loading ◽  
Fixed Bed ◽  
Phosphate Concentration ◽  
Design Parameters ◽  
Phosphate Adsorption ◽  
Fixed Bed Column ◽  
Adsorption Sites ◽  
Bed Height

The excessive discharge of phosphate from anthropogenic activities is a primary cause for the eutrophication of aquatic habitats. Several methodologies have been tested for the removal of phosphate from aqueous solutions, and adsorption in a flow-through reactor is an effective mechanism to reduce the nutrient loading of water. This research aimed to investigate the adsorption potential of leftover coal material to remove phosphate from a solution by using continuous flow fixed-bed column, and analyzes the obtained breakthrough curves. A series of column tests were performed to determine the phosphorus breakthrough characteristics by varying operational design parameters such as adsorbent bed height (5 to 8 cm), influent phosphate concentration (10–25 mg/L), and influent flow rate (1–2 mL/min). The amorphous and crystalline property of leftover coal material was studied using XRD technology. The FT-IR spectrum confirmed the interaction of adsorption sites with phosphate ions. Breakthrough time decreased with increasing flow rate and influent phosphate concentration, but increased with increasing adsorbent bed height. Breakthrough-curve analysis showed that phosphate adsorption onto the leftover coal material was most effective at a flow rate of 1 mL/min, influent phosphate concentration of 25 mg/L, and at a bed height of 8 cm. The maximal total phosphate adsorbed onto the coal material’s surface was 243 mg/kg adsorbent. The Adams–Bohart model depicted the experimental breakthrough curve well, and overall performed better than the Thomas and Yoon–Nelson models did, with correlation values (R2) ranging from 0.92 to 0.98. Lastly, leftover coal could be used in the purification of phosphorus-laden water, and the Adams–Bohart model can be employed to design filter units at a technical scale.

scholarly journals The fixed bed column sorption study for the nitrate removal by a cationic modified inedible pumpkin shell

2020 ◽  
Vol 9 (2) ◽  
pp. 5-13
Author(s):  
Dragana Marković-Nikolić ◽  
Goran Petković ◽  
Nebojša Ristić ◽  
Danijela Bojić ◽  
Miloš Durmišević ◽  
...  
Keyword(s):  
Flow Rate ◽  
Nitrate Removal ◽  
Nitrate Solution ◽  
Fixed Bed ◽  
Breakthrough Time ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Good Potential ◽  
The Relationship ◽  
Sorption Study

A fixed bed column was applied to remove nitrate ions from an aqueous solution using a cationic modified pumpkin shell as a sorbent. The fixed bed column performances were assessed by varying the influent nitrate concentrations (50 mg dm-3 and 100 mg dm-3) and flow rates (20 cm 3 min-1 and 40 cm 3 min-1) with 13 cm bed height of the sorbent. The obtained results showed that increase of the concentration of the initial nitrate solution affects the increase in the amount of nitrate in the effluent and reduces the breakthrough time. A higher flow rate led to the faster column exhaustion, resulting in the shortened lifespan of the column. In this study, the best nitrate removal was achieved for an initial nitrate solution of 100 mg dm-3 at the flow rate of 20 cm 3 min-1 , when a total nitrate removal of 86% is reached. The relationship between the sorption capacity of this sorbent and the varied parameters was assessed and predicted using two different theoretical breakthrough curve models: the Thomas and Yoon-Nelson models. This study confirmed that the cationic modified pumpkin shell in the fixed bed column has good potential for removing nitrate from aqueous solutions.

scholarly journals Adsorption of phosphorus by alkaline Tunisian soil in a fixed bed column

2018 ◽  
Vol 78 (4) ◽  
pp. 751-763 ◽  
Author(s):  
Rihab Beji ◽  
Wissem Hamdi ◽  
Aida Kesraoui ◽  
Mongi Seffen
Keyword(s):  
Regression Analysis ◽  
Adsorption Capacity ◽  
Flow Rate ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Alkaline Soil ◽  
Fixed Bed Column ◽  
P Adsorption ◽  
Bed Height ◽  
P Concentration

Abstract The present study evaluates the phosphorus (P) adsorption by alkaline soil in fixed bed column mode operation. The effects of flow rate, bed height, and initial P concentration on breakthrough curves were evaluated. Data confirmed that both the breakthrough and exhaustion time increased in parallel with the rise in bed height and the decline in flow rate and initial P concentration. The adsorption capacity was observed to increase with decreasing flow rate and bed height and increasing initial concentration. Moreover, continuous adsorption experiments were conducted using three salts (NaCl, KCl and CaCl2) with the same concentration (0.01 M) to investigate the P adsorption behavior in saline conditions. The results showed that all three salts improve the P adsorption in the soil column. Consequently, the bed performance was significantly enhanced with salts addition. The maximum adsorption capacity of 13.47 mg g−1 for P, 16.13 mg g−1 for P-NaCl, 22.10 mg g−1 for P-KCl, 30.05 mg g−1 for P-CaCl2 was attained at an initial influent concentration of 300 mg g−1, bed height of 22 cm, and flow rate of 10 mL min−1. TheCaCl2 addition was therefore the most effective in increasing P adsorption. Thomas, Yoon-Nelson and Clark models were applied to experimental results to forecast the breakthrough curves by nonlinear regression analysis. Meanwhile, the bed depth service time model was employed to examine the effective model parameters in scaling up the process using linear regression analysis. The values of correlation coefficient (R2) and the sum of squared error evidenced that the Thomas model is the most appropriate model to fit the experimental data. The reusability experiment showed that the adsorbent material still had high P adsorption capacity, and tolerable desorption efficiency.

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