scholarly journals Cr(VI) biosorption: Effect of temperature, particle size and bed height

2020 ◽  
pp. 78-86
Author(s):  
Candelaria Nahir Tejada-Tovar ◽  
Angel Villabona-Ortíz ◽  
Rodrigo Ortega Toro
Keyword(s):  
Particle Size ◽  
Fourier Transforms ◽  
Continuous System ◽  
Packed Bed ◽  
Effect Of Temperature ◽  
Infrared Spectrometry ◽  
Packed Bed Column ◽  
Chromium Vi ◽  
Bed Height ◽  
Vis Spectroscopy

The present work aimed to evaluate the effect of temperature, particle size and bed height of the chromium (VI) adsorption process using plantain peels in a continuous system. The experiment was carried out on a packed bed column, adjusting the feed temperature of the solution with a REX-C100 controller coupled to a type K thermocouple. The initial concentration of Cr (VI) was set at 100 ppm, the pH at 2 and the feed rate of 0.75 mL/s. The analyses were performed by UV-Vis spectroscopy using the colourimetric method of 1.5-diphenylcarbazide. The material was characterized by infrared spectrometry by Fourier Transforms (FTIR), from this analysis, it was determined that the OH and NH2 functional groups are the main responsible for the formation of complexes with the cations in solution. Also, it was established that only the particle size is statistically significant. According to the response surface analysis, the optimum conditions of the process were 353.15 K, a particle size of 0.819 mm and a bed height of 67.768 mm. From the thermodynamic study of the process, it is established that it is endothermic and the chemical adsorption prevails in it. The results obtained in the process modelling suggest that Dose-Response can be used reliably to scale the process.

scholarly journals Packed Bed Biosorption of Lead and Copper Ions Using Sugarcane Bagasse

2016 ◽  
Vol 16 (1) ◽  
pp. 23 ◽  
Author(s):  
Norwin Dale F Duga ◽  
Pauline Edrickke A Imperial ◽  
Allan N Soriano ◽  
Aileen D Nieva
Keyword(s):  
Heavy Metals ◽  
Adsorption Capacity ◽  
Sugarcane Bagasse ◽  
Flow Rate ◽  
Copper Ions ◽  
Continuous System ◽  
Packed Bed ◽  
Packed Bed Column ◽  
Varying Parameters ◽  
Bed Height

Bagasse, a waste material from sugarcane has been studied as a biosorbent for removing heavy metals, Pb2+ and Cu2+, in a continuous system using a packed bed column. This study was undertaken to determine the influence of varying the bed height and flow rate on the breakthrough and saturation time. Thomas, Adams-Bohart and Yoon-Nelson models were used to assess the effects of varying parameters and both Thomas and Yoon-Nelson models were found to be satisfactory to describe the column data obtained in the experiment. Moreover, lead ions are adsorbed more efficiently with an adsorption capacity of 4.54 mg/g compared to copper ions with 3.98 mg/g at the most feasible parameters having a flow rate of 100 mL/min and a bed height of 30 cm

scholarly journals Optimization of the Effect of Temperature and Bed Height on Cr (VI) Bioadsorption in Continuous System

2020 ◽  
Vol 29 (54) ◽  
pp. e10477
Author(s):  
Angel Villabona-Ortíz ◽  
Candelaria Tejada-Tovar ◽  
Erika Ruiz-Paternina ◽  
Jesús David Frías-González ◽  
Gerlyn David Blanco-García
Keyword(s):  
Electrostatic Interactions ◽  
Fixed Bed ◽  
Continuous System ◽  
Extraction Process ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
X Ray Diffraction ◽  
Residual Concentration ◽  
Bed Height ◽  
Vis Spectroscopy

In the present paper, the residues of the plantain starch extraction process are proposed as an adsorbent to remove Cr (VI) in a continuous fixed bed-system, varying the temperature in 33, 40, 55, 70 y 76 °C and bed height in the range of 15.5, 30, 65, 100, 114.5 mm. The adsorbent material was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-ray Diffraction Analysis (XRD). The Cr (VI) solution at 100 ppm had contact with the column by gravity, with a flow rate of 0.75 mL/s at the different working conditions. At the end of the process, the residual concentration of the metal was measured by UV-Vis spectroscopy using the standard method for the determination of Cr (VI) in water ASTM D1687-17. From the results, it was established that the bioadsorbent has the presence of hydroxyl, carboxyl and methyl functional groups and that the adsorption process is controlled by electrostatic interactions; the variables evaluated had a significant influence on the process because applying the RSM methodology it was observed that the optimal operating conditions are 81.49 mm of bed height and temperature of 68 ºC. Based on the behavior of the rupture curve, it was found that the bio-material has the potential to be used as a filler in an adsorption column with the purpose of remove Cr (VI).

Column Study for Adsorption of Methylene Blue Dye using Azadirachta indica Adsorbent

2020 ◽  
Vol 17 (4) ◽  
pp. 47-52
Author(s):  
Vibha Goswami ◽  
Renu Upadhyaya ◽  
Sumanta Kumar Meher
Keyword(s):  
Methylene Blue ◽  
Flow Rate ◽  
Azadirachta Indica ◽  
Packed Bed ◽  
Blue Dye ◽  
Feed Flow Rate ◽  
Methylene Blue Dye ◽  
Packed Bed Column ◽  
Bed Height ◽  
Percentage Removal

In this study, synthesised Azadirachta indica adsorbent was used for the removal of methylene blue dye using a packed bed column. The effect of feed flow rate, feed methylene blue dye concentration, and bed height of column on percentage removal of dye was studied. It was observed that the column bed exhausted rapidly at a higher flow rate and therefore, a breakthrough occurred faster. However, it was observed that bed exhaustion time increases on increasing the bed height from 2 to 10 inch at 10 mg/L feed dye concentration and feed flow rate of 40 ml/min. It was also found that the breakthrough curve is more dispersed and the percentage removal of dye increases on decreasing the feed methylene dye concentration from 150 to 10 mg/L. The percentage removal was found to be 96.89% at 20 ml/min of feed flow rate under 10 inch of bed height and 10 mg/L of feed dye concentration. The atomic absorption spectrophotometer and scanning electron microscope were used for estimating the effluent dye concentration from the column and morphological study, respectively.

Effect of Process Parameters on the Adsorption of Chromium VI on a Packed Bed Column (PBC) using Vetiver (Vetiveria zizanioides)

2021 ◽  
Vol 25 (12) ◽  
pp. 53-59
Author(s):  
Pejavara Narayana Gururaj ◽  
Kulathooran Ramalakshmi ◽  
Sureshkumar Sujithra ◽  
Ravichandran Shalini
Keyword(s):  
Process Parameters ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Heating Process ◽  
Tannery Effluent ◽  
Vetiveria Zizanioides ◽  
Experimental Conditions ◽  
Heated Sample ◽  
Packed Bed Column ◽  
Chromium Vi

The objective of this study is to evaluate the different process parameters on adsorption of chromium VI on a packed bed column using Vetiver (Vetiveria zizanioides) and to examine the effect of pH, Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD) at a constant contact time of 10 minutes at a temperature of 40 ºC under two experimental conditions namely, tannery effluent with and without microwave treatment. The results revealed that microwave heating process had a higher impact on chromium (VI) adsorption than normal heating process. The pH values of microwave treated sample were found to be 6.65±0.65 when compared to normal heated sample where the pH was 4.62±0.72 when compared to the initial pH of effluent found to be 3.47±0.58. Further, a threefold reduction in BOD and COD values was observed in microwave treated vetiver sample which was around 86.73±1.43 and 107.90±2.82 mg/l respectively when compared to normal heated sample (250±1.45 and 200±2.65 mg/l respectively) and untreated effluent (780±2.53 and 920±3.86 mg/l respectively) which indicated the reduction of chromium VI present in the effluent water. It was also observed that the metal adsorption capacity of the vetiver powder and the adsorption characteristics were positively correlated with the FTIR and SEM analysis which confirmed the presence of chromium (VI) on the surface of vetiver.

The Research on Mineralization of Desalinated Water by Dissolving Ore for Entering into Municipal Water Supply Network

2013 ◽  
Vol 790 ◽  
pp. 463-466
Author(s):  
Na Tang ◽  
Wei Wang ◽  
Lei Zhang ◽  
Peng Gao Cheng ◽  
Jian Qian Gong ◽  
...  
Keyword(s):  
Particle Size ◽  
Drinking Water ◽  
Calcium Ions ◽  
Water Flow Rate ◽  
Packed Bed ◽  
Pipe Network ◽  
Main Method ◽  
Municipal Water Supply ◽  
Desalinated Water ◽  
Bed Height

Desalination is the main method to solve the lack of freshwater resources in coastal areas. However, the desalinated water needs further treatment to have good chemical stability and meet the drinking water health standards before transporting by municipal pipe network. Considering desalinated seawater in Beijiang Power Plant and current situation of municipal pipe network, the desalinated water was mineralized by dissolving limestone with CO2 in this work. The process results in an enrichment of the water with calcium ions and carbonate. The effect of the limestone particle size, pH, the packed bed height and desalinated water flow rate on result water was investigated, which could offer a principle for the utilization of desalinated.

Biosorption of chromium(VI) using a Sargassum sp. packed-bed column

2008 ◽  
Vol 99 (8) ◽  
pp. 3094-3099 ◽  
Author(s):  
M.G.A. Vieira ◽  
R.M. Oisiovici ◽  
M.L. Gimenes ◽  
M.G.C. Silva
Keyword(s):  
Packed Bed ◽  
Packed Bed Column ◽  
Chromium Vi

Study of Dyestuff Removal from Solution by Sunflower Seed Husk

2011 ◽  
Vol 236-238 ◽  
pp. 3016-3019
Author(s):  
Siriwan Srisorrachatr
Keyword(s):  
Methylene Blue ◽  
Packed Bed ◽  
Synthetic Wastewater ◽  
Solution Temperature ◽  
Adsorption Model ◽  
Packed Bed Column ◽  
Bed Height ◽  
Optimum Ph ◽  
Seed Husk ◽  
Blue Solution

The removal of dyes from synthetic wastewater by sunflower husk was studied in batch and dynamics removal. The extent of adsorption was studied in batch as a function of burning temperature, chemical treatment, adsorbents size, pH and solution temperature. Methylene blue and Mexican red in aqueous solution was used as synthetic wastewater. Dynamic removal of methylene blue and Mexican red by sunflower husk was also studied in packed bed column. In batch, both dyes were removed with the maximum adsorption by unburned adsorbents. Removal of methylene blue was increased when the adsorbents treated with NaOH whereas treated with HCl for Mexican red. The optimum pH for removal of methylene blue solution was between 4 and 10 and the maximum value for Mexican red was pH 2. The adsorption of methylene blue and Mexican red follows Langmuir adsorption model. In packed bed column, values of column parameter were investigated as a function of flow rate and bed height. Dynamic of adsorption process was modeled by bed depth service time (BDST) and the experimental data were fitted very well to the BDST model

scholarly journals Breakthrough and thermodynamic adsorption of Cr (VI) y Ni (II) bioadsorption in continuous system

2021 ◽  
Vol 26 (1) ◽  
pp. 72-81
Author(s):  
Candelaria Nahir Tejada Tovar ◽  
Luis Carlos Newball López ◽  
Camilo Esteban Cardona Lara
Keyword(s):  
Room Temperature ◽  
Continuous System ◽  
Packed Bed ◽  
Hydroxyl Groups ◽  
Heterogeneous Structure ◽  
Active Centers ◽  
Chromium Vi ◽  
Removal Of Heavy Metals ◽  
Useful Life ◽  
Mutagenic Effects

The removal of heavy metals present in water is an issue of environmental interest, due to bioaccumulation, biomagnification and the carcinogenic and mutagenic effects on living beings. The objective of the present study was to use plantain peel residues in Chromium (VI) and Nickel (II) removal in continuous system, evaluating the effect of bedheight, temperature and adsorbent particle size on the process; obtaining a 98.7% 99.71% removal yield for Cr (VI) and Ni(II), respectively. The FTIR showed that the bioadsorbent has a heterogeneous structure with the presence of hydroxyl groups, saturated and unsaturated hydrocarbons, carbonyls, carboxyl, among others, and it was established that the process is controlled by electrostatic reactions between the active centers and the metal. The breaka ge curve was carried out under the optimal conditions established by the Response Surface Methodology (RSM) and it was established that the bioadsorbent has an extensive useful life, as it was not saturated throughout the process. The hermodynamic parameters established that the process is exothermic and irreversible, being favored at room temperature. Taking into account the behavior of plantain peels during the breakage curve, it is recommended to use it as a filler in a packed bed to remove Cr (VI) and Ni (II).

C. Biodiesel Dari Minyak Biji Nyamplung Melalui Proses Transesterifikasi Dengan Reaktor Sistem Aliran Berkelanjutan

2019 ◽  
Vol 2 (1) ◽  
pp. 19-26
Author(s):  
Yanatra budi Pramana
Keyword(s):  
Flow Velocity ◽  
Seed Oil ◽  
Internal Standard ◽  
Packed Bed ◽  
Effect Of Temperature ◽  
Molar Ratio ◽  
Packed Bed Column ◽  
Independent Variables ◽  
Product Flow ◽  
Acid Catalyzed

This study aims to study the effect of temperature, flow velocity in the reactor and product flow velocity on FAME yield in the transesterification process of nyamplung seed oil into biodiesel in packed bed columns. As a whole the process involved includes degumming, acid catalyzed esterification and alkaline catalyzed transesterification. The transesterification process is carried out in a packed bed column. In the transesterification process, the fixed variable is the molar ratio of methanol to oil and the amount of NaOH catalyst to oil. While the independent variables are temperature, flow velocity in the reactor and the transesterification product flow rate and the response variable is (percentage)% FAME in the product. To obtain% FAME, product samples were analyzed using GC with internal standard methods.

scholarly journals Batch and Packed Bed Column Study for the Removal of Cr (VI) and Ni (II) Using Agro-Industrial Wastes

2021 ◽  
Vol 11 (19) ◽  
pp. 9355
Author(s):  
Candelaria Tejada-Tovar ◽  
Angel Villabona-Ortíz ◽  
Rodrigo Ortega-Toro
Keyword(s):  
Mesoporous Structure ◽  
Packed Bed ◽  
Industrial Wastes ◽  
Structure Characteristic ◽  
Optimum Conditions ◽  
Packed Bed Column ◽  
Batch Systems ◽  
Bed Height ◽  
Batch System ◽  
Relevant Factors

The objective of this study was to prepare bio adsorbents from agro-industrial wastes from yam starch (YSR) and plantain (PSR) production for its use in the removal of Cr (VI) and Ni (II) in aqueous solution in batch and continuous packed-bed column systems. Bromatological analysis showed that the biomaterials are rich in cellulose, lignin, hemicellulose, and SEM micrographs that evidence a mesoporous structure characteristic of materials of lignocellulosic origin. FTIR evidenced functional groups such as hydroxyl, carbonyl, and methyl, possibly involved in the uptake of metal ions. EDS and FTIR analysis after adsorption confirmed that the retention of the metals on the surface of the adsorbent materials was successful. Cr (VI) and Ni (II) removal efficiencies above 80% were achieved using YSR and PSR in batch systems at the different conditions evaluated. The optimum conditions for removing Ni (II) on PSR were a bed height of 11.4 cm and a temperature of 33 °C, while for YSR, they were: 43 °C and 9 cm for temperature and bed height respectively. The variable with the most significant influence on the removal of Cr (VI) in a batch system on the two bio adsorbents was temperature. In contrast, the adsorbent dose and temperature are relevant factors for PSR Ni (II) removal. Therefore, the residues from the preparation of yam and plantain starch have high potential for removing heavy metals from wastewater and are presented as an alternative for their final disposal.

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