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.

scholarly journals Study on Reactive Blue Adsorption on Raw and Modified Wheat Straw Using Fixed-Bed Column

2021 ◽  
Vol 24 (1) ◽  
pp. 1-7
Author(s):  
Alaa Taha ◽  
Khalid M. Mousa
Keyword(s):  
Wheat Straw ◽  
Adsorption Capacity ◽  
Flow Rate ◽  
Low Cost ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Blue Dye ◽  
Time Model ◽  
Fixed Bed Column ◽  
Bed Height

The intention of this study was to explore the efficiency and feasibility of adsorption of Reactive Blue dye (H3R) used in textile industries using Raw wheat straw (RWS) and Modified wheat straw (MWS) as a low-cost adsorbent. Wheat straw was modified using cationic surfactant (CTAB) to study the improvement of dye removal. The properties of Raw and Modified wheat straw are studied by means of Fourier transform infrared (FTIR) and scanning electron microscope (SEM) analyses to determine the functional groups and the nature of their surface. Continuous experiments were done by fixed-bed column to study the characteristics of the breakthrough curve using different bed heights and flow rates. Results showed that the breakthrough time increases with increasing bed height and decreasing flow rate, in turn results into higher removal capacity. Results also showed a higher flow rate lead a lower adsorption capacity due to insufficient residence time. Bed depth service time model (BDST), Adam-Bohart and Thomas models were used to predict the breakthrough curves and to determine the adsorption capacity of the column. The highest bed capacity of 12.95 and 32.2 mg/g for MWS was obtained using 10 mg/L, 10 cm bed height at 10 mL/min and 30 mL/min respectively.

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 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 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 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.

Zinc(II) desorption by Sargassum filipendula biomass in batch and in fixed-bed column for multiple sorption-regeneration cycles

2009 ◽  
Vol 60 (2) ◽  
pp. 357-362 ◽  
Author(s):  
Araceli A. Seolatto ◽  
Maurício M. Câmara ◽  
Eneida S. Cossich ◽  
Célia R. G. Tavares ◽  
Edson A. Silva
Keyword(s):  
Adsorption Capacity ◽  
Flow Rate ◽  
Batch Reactor ◽  
Fixed Bed ◽  
Feed Concentration ◽  
Fixed Bed Column ◽  
Batch System ◽  
High Efficient ◽  
Sargassum Filipendula

The reusability of the alga Sargassum filipendula was studied in batch reactor and in fixed-bed column in order to investigate Zn(II)-laden biomass regeneration. Four types of desorbing solutions at two different concentrations were tested and the results obtained to the desorption efficiencies were higher than 90% for three of the agents. Ten consecutive sorption-regeneration cycles at a flow rate of 8 mL/min were carried in fixed bed column with the feed concentration of 50 mg/L and using two eluent solutions: H2SO4 (0.1 M) and MgSO4 (3.5% at pH 3), which showed the best ability to elution tests in batch system. The column was used for a period of 30 days. The adsorption capacity decreased the passing of cycles, but the total amount of zinc removed after 10 cycles was approximately 8 times greater than if the biomass had been used for only one time, for both agents tested. Therefore, the regeneration in the Sargassum filipendula column through the two desorbing agents tested showing high efficient use of biomass and facilitating the process of treatment of wastewater containing metals that has successive exchanges of biomass.

Fixed-Bed Column Study for the Removal of Ag(I)and Cr(III) from Aqueous Solutions Using Puffed Rice Husk

2011 ◽  
Vol 287-290 ◽  
pp. 1620-1625
Author(s):  
Yan Wu ◽  
Zai Fang Deng ◽  
Yang Tao ◽  
Xue Gang Luo
Keyword(s):  
Aqueous Solutions ◽  
Rice Husk ◽  
Flow Rate ◽  
Service Time ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Model Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Puffed Rice

Fixed-bed column studies for the removal of Ag(Ⅰ) and Cr(Ⅲ) from individual aqueous solutions using puffed rice husk were investigated in this work. The experiments were conducted to study the effect of important column parameters such as bed height, feed flow rate and feed initial concentration of solution. It was found that increasing bed depth yielded longer service time while increase in influent concentration and flow rate resulted in faster breakthrough. Bed Depth Service Time (BDST) model was applied to analyze the experimental data and the model parameters were evaluated. Good agreement of the experimental breakthrough curves with the model predictions was observed.

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