scholarly journals Biosorption of Cd²+ and Cu²+ onto wheat straw using batch and continuous fixed-bed column systems

2021 ◽  
Author(s):  
Hameed Muhamad
Keyword(s):  
Experimental Data ◽  
Wheat Straw ◽  
Metal Removal ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Batch System ◽  
Langmuir Isotherm Model ◽  
Concentration Changes ◽  
Triticum Sativum

Biosorption of Cd²+ and Cu²+ by wheat straw (Triticum Sativum) using a batch system and a continuous upflow mode in a fixed bed column was studied. For batch system, the effect of pH over a range from 3.0 to 7.0 and the temperature from 20 to 40ºC on the metal removal was investigated. Various initial metal concentrations from 20 to 150 mg/L were used. Adsorption of metal ions was observed to increase with liquid pH and temperature. Among the three widely used isotherms, namely the Langmuir, Freundlich, and Timken models, the experimental data better fitted the Langmuir isotherm model. For the continuous upflow mode in a fixed bed (4-inch diameter), experiments were performed over a range of flow rate from 0.3-1.0 LPM and varied bed height of 0.5-2.0m. The results obtained also agree (BDST) model. In addition, for estimations of the parameters that are necessary for the design of a fixed bed adsorber in paractical application, the experimental data were fitted to the Thomas, Adams-Bohart, Yan and Yoon-Nelson models. Thomas model appeared to describe the experimental results well. Mathematical model was developed to simulate the concentration changes at the experimental time instances.

scholarly journals Biosorption of Cd²+ and Cu²+ onto wheat straw using batch and continuous fixed-bed column systems

2021 ◽  
Author(s):  
Hameed Muhamad
Keyword(s):  
Experimental Data ◽  
Wheat Straw ◽  
Metal Removal ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Batch System ◽  
Langmuir Isotherm Model ◽  
Concentration Changes ◽  
Triticum Sativum

Biosorption of Cd²+ and Cu²+ by wheat straw (Triticum Sativum) using a batch system and a continuous upflow mode in a fixed bed column was studied. For batch system, the effect of pH over a range from 3.0 to 7.0 and the temperature from 20 to 40ºC on the metal removal was investigated. Various initial metal concentrations from 20 to 150 mg/L were used. Adsorption of metal ions was observed to increase with liquid pH and temperature. Among the three widely used isotherms, namely the Langmuir, Freundlich, and Timken models, the experimental data better fitted the Langmuir isotherm model. For the continuous upflow mode in a fixed bed (4-inch diameter), experiments were performed over a range of flow rate from 0.3-1.0 LPM and varied bed height of 0.5-2.0m. The results obtained also agree (BDST) model. In addition, for estimations of the parameters that are necessary for the design of a fixed bed adsorber in paractical application, the experimental data were fitted to the Thomas, Adams-Bohart, Yan and Yoon-Nelson models. Thomas model appeared to describe the experimental results well. Mathematical model was developed to simulate the concentration changes at the experimental time instances.

scholarly journals Fixed bed adsorption treatment of effluent of battery recycling unit to remove Pb(II) using steam-activated granular carbon

2020 ◽  
Vol 85 (7) ◽  
pp. 953-965
Author(s):  
Saurabh Meshram ◽  
Chandrakant Thakur ◽  
Anupam Soni
Keyword(s):  
Experimental Data ◽  
Fixed Bed ◽  
Breakthrough Time ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Battery Recycling ◽  
Fixed Bed Adsorption ◽  
Clark Model ◽  
Adsorption Treatment ◽  
Adsorbent Capacity

Battery recycling generates large amount of effluent which contains the toxic Pb(II) beyond the permissible limit. This effluent was treated for the removal of Pb(II) by fixed bed adsorption onto steam-activated granular carbon. Effect of flow rate, bed diameter and bed height on the performance of fixed bed column was investigated. The experimental data was presented in the form of breakthrough curve. Bed exhaustion time, breakthrough time and adsorbent capacity were determined. The obtained experimental data were evaluated with the four kinetic models: Thomas, Yoon?Nelson, Adams?Bohart and Clark model. The data were fitted well to the Thomas, Yoon?Nelson and Clark model with correlation coefficient R2 > 0.96.

scholarly journals Batch and fixed-bed column studies for the biosorption of Cu(II) and Pb(II) by raw and treated date palm leaves and orange peel

2017 ◽  
Vol 19 (3) ◽  
pp. 464-478 ◽  
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Date Palm ◽  
Metal Removal ◽  
Fixed Bed ◽  
Orange Peel ◽  
Batch Adsorption ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Adsorbent Dose

Herein, we describe the batch and fixed-bed column adsorption of Cu2+ and Pb2+ by raw and treated date palm leaves (DP) and orange peel (OP) waste biomass. Contact time, pH, adsorbent dose, and particle size were optimized in batch adsorption experiments, while breakthrough curves obtained in fixed-bed adsorption experiments were used to determine the effects of bed height, initial metal concentration, particle size, and flow rate. The use of treated DP and/or OP in batch adsorption mode increased the removal efficiency of metal ions by 20–30% compared to that observed for raw adsorbents. The equilibration time was estimated as 0.5 h, with rapid metal removal observed during the first 15 min at an optimum pH value of ~5. Increasing the adsorbent dose from 0.5 to 6–7 g enhanced the metal removal efficiency by ~60%, whereas a particle size increase from 50 to 300 µm decreased this value by about 30% for both Cu2+ and Pb2+ and both raw and treated DP/OP. Both breakthrough and exhaust times increased with increasing bed height of the fixed-bed column, and the effect observed for treated DP exceeded that observed for raw DP by a factor of two. Conversely, both breakthrough and exhaust times decreased with increasing initial metal concentration, particle size, and flow rate. Increasing the particle size from 100–150 to 300 µm changed the exhaust time by 8 h when treated DP was used for Pb2+ adsorption. The obtained linear regression coefficients (R2 = 0.9–0.99) suggest that both Thomas and Yoon–Nelson models are well-suited for predicting the adsorption performance of the present system.

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 Bimetallic Fe/Al-MOF for the Adsorptive Removal of Multiple Dyes: Optimization and Modeling of Batch and Hybrid Adsorbent-river Sand Column Study

2021 ◽  
Author(s):  
Hemant Singh ◽  
Sankalp Raj ◽  
Rishi karan singh rathour ◽  
Jayanta Bhattacharya
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Fixed Bed ◽  
Maximum Adsorption Capacity ◽  
Feed Concentration ◽  
River Sand ◽  
Fixed Bed Column ◽  
Column Study ◽  
Adsorptive Removal ◽  
Bed Height

Abstract Bimetallic Metal organic framework (MOF) has garnered interest over the years with its application in various environmental remediation. In this study, Fe-Al-1,4-Benzene di-Carboxylic acid (FeAl(BDC)) MOF was synthesized, and adsorptive removal of Rhodamine B dye in batch and unique hybrid FeAl (BDC)-River sand fixed-bed column was achieved. The experimental data from the batch studies corroborated well with the Pseudo second-order (PSO) and Freundlich adsorption isotherm models. Furthermore, a fixed-bed column study was conducted to assess the effect of varying flow rate (2, 5, 8 mL/min), bed height (5, 9, 13 cm), and feed concentration (10, 20, 30 mg/L) on the adsorption performance of FeAl(BDC) in continuous mode of operation. A uniform mixture of river sand and FeAl(BDC) by weight ratio (9:1) was achieved prior to packing the column. The column study reveals that Sand-FeAl(BDC) can achieve the maximum adsorption capacity of 113.05 mg/g at a flow rate of 5 mL/min, feed concentration of 20 mg/L, and bed height of 13 cm. The experimental data of the column study were successfully fitted with BDST, Thomas, Yoon-Nelson, and Dose-response models. The fitting parameter values from the BDST model raise the scope of possible upscaling of the fixed-bed column. Hence, it is proposed that these River sand-FeAl(BDC)-based filters can be widely used in areas facing critical contamination and in poor communities with a high demand for water.

Biochar caged zirconium ferrite nanocomposites for the adsorptive removal of Reactive Blue 19 dye in a batch and column reactors and conditions optimizaton

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shazia Perveen ◽  
Raziya Nadeem ◽  
Shaukat Ali ◽  
Yasir Jamil
Keyword(s):  
Experimental Data ◽  
Low Dose ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Adsorption Efficiency ◽  
Fixed Bed Column ◽  
Flow Rates ◽  
Adsorptive Removal ◽  
Reactive Blue 19 ◽  
Pseudo Second Order

Abstract Biochar caged zirconium ferrite (BC-ZrFe2O5) nanocomposites were fabricated and their adsorption capacity for Reactive Blue 19 (RB19) dye was evaluated in a fixed-bed column and batch sorption mode. The adsorption of dye onto BC-ZrFe2O5 NCs followed pseudo-second-order kinetics (R 2 = 0.998) and among isotherms, the experimental data was best fitted to Sips model as compared to Freundlich and Langmuir isotherms models. The influence of flow-rate (3–5 mL min−1), inlet RB19 dye concentration (20–100 mg L−1) and quantity of BC-ZrFe2O5 NCs (0.5–1.5 g) on fixed-bed sorption was elucidated by Box-Behnken experimental design. The saturation times (C t /C o  = 0.95) and breakthrough (C t /C o  = 0.05) were higher at lower flow-rates and higher dose of BC-ZrFe2O5 NCs. The saturation times decreased, but breakthrough was increased with the initial RB19 dye concentration. The treated volume was higher at low sorbent dose and influent concentration. Fractional bed utilization (FBU) increased with RB19 dye concentration and flow rates at low dose of BC-ZrFe2O5 NCs. Yan model was fitted best to breakthrough curves data as compared to Bohart-Adams and Thomas models. Results revealed that BC-ZrFe2O5 nanocomposite has promising adsorption efficiency and could be used for the adsorption of dyes from textile effluents.

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.

Adsorption characteristics of methylene blue onto agricultural wastes lotus leaf in bath and column modes

2011 ◽  
Vol 64 (3) ◽  
pp. 654-660 ◽  
Author(s):  
Xiuli Han ◽  
Wei Wang ◽  
Xiaojian Ma
Keyword(s):  
Methylene Blue ◽  
Fixed Bed ◽  
Isotherm Models ◽  
Column Experiments ◽  
Fixed Bed Column ◽  
Lotus Leaf ◽  
Bed Height ◽  
Column Adsorption ◽  
Equilibrium Data ◽  
Leaf Powder

The adsorption potential of lotus leaf to remove methylene blue (MB) from aqueous solution was investigated in batch and fixed-bed column experiments. Langmuir, Freundlich, Temkin and Koble–Corrigan isotherm models were employed to discuss the adsorption behavior. The results of analysis indicated that the equilibrium data were perfectly represented by Temkin isotherm and the Langmuir saturation adsorption capacity of lotus leaf was found to be 239.6 mg g−1 at 303 K. In fixed-bed column experiments, the effects of flow rate, influent concentration and bed height on the breakthrough characteristics of adsorption were discussed. The Thomas and the bed-depth/service time (BDST) models were applied to the column experimental data to determine the characteristic parameters of the column adsorption. The two models were found to be suitable to describe the dynamic behavior of MB adsorbed onto the lotus leaf powder column.

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.

scholarly journals Study of a fixed-bed column in the adsorption of an azo dye from an aqueous medium using a chitosan–glutaraldehyde biosorbent

2017 ◽  
Vol 36 (1-2) ◽  
pp. 215-232 ◽  
Author(s):  
Jaime López-Cervantes ◽  
Dalia I Sánchez-Machado ◽  
Reyna G Sánchez-Duarte ◽  
Ma A Correa-Murrieta
Keyword(s):  
Flow Rate ◽  
Service Time ◽  
Fixed Bed ◽  
Textile Dye ◽  
Time Model ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Direct Blue ◽  
Direct Blue 71 ◽  
Bed Depth Service Time

A continuous adsorption study in a fixed-bed column was carried out using a chitosan–glutaraldehyde biosorbent for the removal of the textile dye Direct Blue 71 from an aqueous solution. The biosorbent was prepared from shrimp shells and characterized by scanning electron microscopy, X-ray diffraction, and nuclear magnetic resonance spectroscopy. The effects of chitosan–glutaraldehyde bed height (3–12 cm), inlet Direct Blue 71 concentration (15–50 mg l−1), and feed flow rate (1–3 ml min−1) on the column performance were analyzed. The highest bed capacity of 343.59 mg Direct Blue 71 per gram of chitosan–glutaraldehyde adsorbent was obtained using 1 ml min−1 flow rate, 50 mg l−1 inlet Direct Blue 71 concentration, and 3 cm bed height. The breakthrough curve was analyzed using the Adams–Bohart, Thomas, and bed depth service time mathematical models. The behaviors of the breakthrough curves were defined by the Thomas model at different conditions. The bed depth service time model showed good agreement with the experimental data, and the high values of correlation coefficients (R2 ≥ 0.9646) obtained indicate the validity of the bed depth service time model for the present column system.

Sign in / Sign up

Export Citation Format

Share Document