scholarly journals Investigating simplified fixed bed design models for the adsorption of fluoride onto crushed burnt clay pot

2014 ◽  
Vol 3 (4) ◽  
pp. 512 ◽  
Author(s):  
Beraki Bahre Mehari ◽  
Alfred O. Mayabi ◽  
Beatrice K. Kakoi
Keyword(s):  
Flow Rate ◽  
Fluoride Concentration ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Batch Adsorption ◽  
Design Models ◽  
Bdst Model ◽  
Fluoride Adsorption ◽  
Burnt Clay ◽  
Straight Line

The breakthrough curves of fluoride adsorption onto crushed burnt clay pot in mini column fixed bed depths of 15, 20, and 25 cm at a continuous flow rate of 2.5, 5, 10 and 15 ml/min were used to investigate the simplified fixed bed design models (BDST and EBRT). The influent fluoride concentration was 5 mg/L and the breakthrough point was taken at 30% of the influent concentration. Results indicate that the BDST curve had the form of straight line explaining more than 99.6% of the data and thus confirmed to obey the BDST model. For the same operating parameters of 50 cm bed depth and 36 cm/h flow rate, 350 L water could have been defluoridated using BDST model, however, in the case of the pilot experiment, 324 L were defluoridated from 5 to 1.5 mg/L fluoride. This was 8% higher only and hence was not significant. Similarly, when the bed depth data were analyzed, results indicate that at higher EBRT values, the adsorbent exhaustion rate were similar to the batch adsorption and thus the EBRT model could be used to optimize for the design of defluoridation unit. Therefore, the simplified fixed bed design models (BDST and EBRT) could be successfully applied to analyze the column performance and design a fluoride adsorption system based on crushed burnt clay pot as a sorbent media. Keywords: Breakthrough Curve, BDST, EBRT, Crushed Burnt Clay Pot, Fluoride Adsorption.

scholarly journals Packed bed column studies for the removal of dyes using novel sorbent

2013 ◽  
Vol 19 (4) ◽  
pp. 461-470 ◽  
Author(s):  
R. Rajeshkannan ◽  
M. Rajasimman ◽  
N. Rajamohan
Keyword(s):  
Flow Rate ◽  
Fixed Bed ◽  
Packed Bed ◽  
Breakthrough Curves ◽  
Column Studies ◽  
Packed Bed Column ◽  
Bdst Model ◽  
Tamarind Seed ◽  
Acid Blue ◽  
Good Agreement

A continuous fixed bed study was carried out by using tamarind seed as a sorbent for the removal of malachite green (MG) and acid blue 9(AB9) from aqueous solution. The effect of factors, such as flow rate and bed depth was studied. Data confirmed that the breakthrough curves were dependent on flow rate and bed depth. Thomas, Adams-Bohart, and Yoon-Nelson models were applied to experimental data to predict the breakthrough curves using non-linear regression and to determine the characteristic parameters of the packed bed column. Bed depth/service time analysis (BDST) model was used to express the effect of bed depth on breakthrough curves. The results showed that Thomas model was found suitable for the normal description of breakthrough curve at the experimental condition, while Adams-Bohart and Yoon-Nelson model were able to explain only the initial part of dynamic behaviour of the tamarind seed column. The data were in good agreement with BDST model. It was concluded that the tamarind seed can be effectively used as a sorbent for the removal of dyes.

scholarly journals Biosorption of Fluoride from Synthetic and Ground Water Using Chlorella vulgaris Immobilized in Calcium Alginate Beads in an Upflow Packed Bed Column

2017 ◽  
Vol 61 (3) ◽  
pp. 188 ◽  
Author(s):  
Poornima G. Hiremath ◽  
Thomas Theodore
Keyword(s):  
Experimental Data ◽  
Ground Water ◽  
Chlorella Vulgaris ◽  
Water Samples ◽  
Packed Column ◽  
Fluoride Concentration ◽  
Fixed Bed ◽  
Fluoride Removal ◽  
Fluoride Ions ◽  
Fluoride Adsorption

The potential of immobilized Chlorella vulgaris to remove fluoride from synthetic and real ground water samples in a fixed bed was investigated. The effect of important kinetic parameters including column bed height, feed flow rate and influent fluoride concentration of solution on fluoride removal was studied. Thomas, Yoon-Nelson, and BDST models were used to analyze the experimental data and understand the influence on biosorption performance. The models’ predictions were in good agreement with the experimental data for all the process parameters studied, indicating that the models were suitable for fixed-bed column design. Fluoride adsorption was reversible. Desorption of fluoride ions was accomplished by pumping 0.1 N HCl solution. The reusability of adsorbent was studied by subjecting column to repeated cycles of fluoride adsorption and desorption. The suitability of immobilized C. vulgaris adsorbent for fluoride removal from ground water samples of Pavagada taluk, Tumakuru district was studied in the packed column.

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.

Pilot Scale Continuous Adsorption of Soluble Oil Wastewater by Modified Sugarcane Bagasse with Al2(SO4)3 as Adsorbent

2020 ◽  
Vol 990 ◽  
pp. 177-182
Author(s):  
Toungrat Janpattanapong ◽  
Kowit Piyamongkala ◽  
Von Louie R. Manguiam
Keyword(s):  
Sugarcane Bagasse ◽  
Flow Rate ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Pilot Scale ◽  
Breakthrough Curves ◽  
Continuous Adsorption ◽  
Before And After ◽  
Significant Uptake ◽  
Oil Wastewater

The modified sugarcane bagasse with aluminum sulfate was used as an adsorbent for the removal of soluble oil wastewater. The effects of the flow rate, 5 and 10 cm3/min and the number of columns used were thoroughly investigated in a continuous up-flow adsorption process. At the flow rate of 5 cm3/min respected to the 2nd column, the highest breakthrough point to adsorb soluble oil wastewater was at 6 hrs. The results confirmed that the modified sugarcane bagasse can be used as an adsorbent for fixed-bed continuous adsorption of soluble oil wastewater from steel pipe factory. The breakthrough curves were predicted by Yoon-Nelson model. This model may be fitted to predict the overall breakthrough curve using the experimental data gathered. In addition, the significant uptake of the soluble oil wastewater was demonstrated by the changes in the heat of combustion of the modified sugarcane bagasse before and after the adsorption process.

Uptake of Pb and Zn from a binary solution onto different fixed bed depths of natural zeolite – the BDST model approach

Clay Minerals ◽  
2015 ◽  
Vol 50 (1) ◽  
pp. 91-101 ◽  
Author(s):  
I. Nuić ◽  
M. Trgo ◽  
J. Perić ◽  
N. Vukojević Medvidović
Keyword(s):  
Natural Zeolite ◽  
Binary Systems ◽  
Binary Solution ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Design Parameters ◽  
Bdst Model ◽  
Column System ◽  
Lead And Zinc ◽  
Model Approach

AbstractThe removal of lead and zinc from a binary solution by fixed bed depths (40, 80 and 120 mm) of a natural zeolite was examined at a flow rate of 1 mL/min. The results obtained were fitted to the Bed Depth Service Time (BDST) model and the parameters of the model (q and k) were used to design a column system for flow rates of 2 and 3 mL/min at a bed depth of 80 mm. The experimental results were in excellent agreement with those predicted and experimental breakthrough curves for the binary systems were obtained. This approach facilitates the design of effective binary column processes without additional experimentation. Two major design parameters, the Empty Bed Contact Time (EBCT) and the zeolite usage rate, were calculated. The highest EBCT value of 13.56 min represents the optimal conditions for the binary (Pb+Zn) solution.

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.

scholarly journals Adsorption of malachite green in a fixed-bed columns by Thiourea modified poly(acrylonitrile-co-acrylic acid)

2019 ◽  
Vol 25 (4) ◽  
pp. 383-393
Author(s):  
Abel Adeyi ◽  
Siti Jamil ◽  
Luqman Abdullah ◽  
Thomas Choong ◽  
Mohammad Abdullah ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Malachite Green ◽  
Flow Rate ◽  
Dynamic Models ◽  
Fixed Bed ◽  
Correlation Coefficients ◽  
Packed Bed ◽  
Breakthrough Curves ◽  
Solution Ph ◽  
Poly Acrylonitrile

Thiourea-modified poly(acrylonitrile-co-acrylic acid) (TU-poly(AN-co-AA)) polymeric adsorbent was synthesized and characterized with Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM) and Zetasizer. Adsorptive removal of cationic malachite green (MG) dye from aqueous solution in a continuous TU-poly(AN-coAA) packed-bed column was studied. The influences of solution pH (2-9), inlet MG concentration (25-80 mg/L), bed depth (4-8 cm) and linear flow rate (1.5-5.0 mL/min) were investigated via assessment of the column breakthrough curves. Low pH and short bed depth, high MG concentration and flow rate led to early breakthrough of MG. According to correlation coefficients (R2) and sum of the squares of the errors (SSE) values, Thomas and Yoon-Nelson dynamic models are more suitable to describe the column experimental data compared to the Bohart-Adams model. TU-poly(AN-co-AA) exhibited effective separation of MG from the liquid phase and displayed high adsorption capacities after five regeneration cycles.

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 Synthesis and application of CeO2/sawdust nanocomposite for removal of As (III) ions from aqueous solutions using a fixed bed column system

2016 ◽  
Vol 19 (1) ◽  
pp. 7-16 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Flow Rate ◽  
Fixed Bed ◽  
Cost Effective ◽  
Sorption Process ◽  
Breakthrough Curves ◽  
Precipitation Method ◽  
Thomas Model ◽  
Influent Concentration ◽  
Column System

<p>In this study, nanocomposite of ceria sawdust (CeO<sub>2</sub>/SD) synthesized by precipitation method was utilized for removal of As (III) ions from aqueous solutions. Study of the process was done in column system. Characterization of the nano sized adsorbent particles was carried out using XRD and SEM techniques. The effects of important parameters, such as the value of initial pH, the flow rate, the influent concentration of arsenic and bed depth were studied in the column system. The Thomas model was applied for treatment of the adsorption data at different flow rate, influent concentration and bed depth. The bed-depth/service time analysis (BDST) model was also applied at different bed depth to predict the breakthrough curves. The two models were found suitable for describing the bio sorption process of the dynamic behavior of the CeO<sub>2</sub>/SD adsorbent in column investigation. Based on Thomas model, the equilibrium adsorption reached 8.28 mg g<sup>−</sup><sup>1</sup> when a As(III) polluted solution with influent concentration of As 10 mg l<sup>-1 </sup>passed through the column with a flow rate of 2 ml min<sup>−</sup><sup>1</sup>. All the results suggested the presented nanocomposite as an efficient and cost effective adsorbent for removal of As (III) ions from aqueous solutions.</p>

scholarly journals A Fixed-Bed Column Study for Removal of Organic Dyes from Aqueous Solution by Pre-Treated Durian Peel Waste

2019 ◽  
Vol 19 (2) ◽  
pp. 486 ◽  
Author(s):  
Nguyen Thi Thuong ◽  
Nguyen Thi Tuyet Nhi ◽  
Vo Thi Cam Nhung ◽  
Hoang Ngoc Bich ◽  
Bui Thi Phuong Quynh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Flow Rate ◽  
Crystal Violet ◽  
Organic Dyes ◽  
Fixed Bed ◽  
Complete Removal ◽  
Breakthrough Curves ◽  
Experimental Conditions ◽  
Fixed Bed Column ◽  
Efficient Treatment

A number of harmful effects on the ecosystem, the life of humankind, and living species caused by dye-contaminated wastewater have urged the development for an efficient and cost-efficient treatment method for colored effluents. The cellulose-based adsorbents have been considered as a facile and efficient approach to remove hazardous pollutants because of the abundance of inexpensive agricultural wastes in Viet Nam. This study aims to investigate the elimination of methylene blue (MB) and crystal violet (VL) from wastewater using a fixed-bed column of pre-treated durian peel. Examined variables in the process are bed depths (2–6 cm), flow rate (5–20 mL/min), and influent dye concentrations (200–600 mg/L). The highest adsorption amount of pre-treated DP was 235.80 mg/g and 527.64 mg/g, respectively, on a 600 mg/L of methylene blue and crystal violet achieved within a bed height of 4 cm and a flow rate of 10 mL/min. Accordingly, the breakthrough curves were constructed and modeled using the relevant theoretical models under the effects of different experimental conditions. Pre-treated durian peel was found to exhibit high adsorption capacity for cationic dye in an initial concentration of 200–600 mg/L with complete removal being obtained.

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