Effective defluoridation of industrial wastewater by using acid modified alumina in fixed-bed adsorption column: Experimental and breakthrough curves analysis

2021 ◽  
Vol 279 ◽  
pp. 123645
Author(s):  
Usha Kumari ◽  
Asmita Mishra ◽  
Hammad Siddiqi ◽  
B.C. Meikap
Keyword(s):  
Industrial Wastewater ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Modified Alumina ◽  
Adsorption Column ◽  
Fixed Bed Adsorption

scholarly journals Removal of iron and manganese from groundwater sources using nano-biosorbents

2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Mohammad Akbari Zadeh ◽  
Allahyar Daghbandan ◽  
Behrouz Abbasi Souraki
Keyword(s):  
Particle Size ◽  
Rice Straw ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Tea Leaves ◽  
Adsorption Column ◽  
Bet Analysis ◽  
Fixed Bed Adsorption ◽  
Fe And Mn ◽  
Iron And Manganese

Abstract Background The presence of iron (Fe) and manganese (Mn) ions in rocky beds leads to groundwater pollution. Moreover, their excessive concentration causes bad taste and color stains of water. Methods Tea leaves-derived char (TLC), rice straw-derived char (RSC), and nanosilica (NS) were used to adsorb Fe and Mn ions from water sources. The effects of parameters such as contact time, composition percentage, and particle size of biosorbents in a fixed-bed adsorption column were investigated. Results The study on the adsorption of Fe and Mn ions showed that the amount of adsorption increased significantly by decreasing the particle size. Furthermore, the combination of nano-biosorbents with nanosilica improved the adsorption. The Thomas and Adams–Bohart models adequately indicated the adsorption of Fe and Mn ions onto nano-biosorbents in the column mode. The TLC and RSC with NS are applicable for the removal of Fe and Mn ions from groundwater. Conclusions According to the BET analysis results, with more crushing of biosorbents by ball mill and placing them in the furnace, specific surface area of tea leaves and rice straw increased from 0.29 to 3.45 and from 3.70 to 10.99 m2/g, respectively. The absorption of iron and manganese from the aqueous solution increased with the percentage of nano-silica. According to breakthrough curves, under best conditions (the seventh mode), nano-biosorbents could remove 98.05% and 97.92% of iron and manganese ions, respectively. The maximum equilibrium capacity of the adsorption column (mg/g) was 256.56 for iron and 244.79 for manganese. Graphical abstract

Fixed-Bed Adsorption Column Studies for the Removal of Methyl Orange from Water Using Polyethyleneimine-Graphene Oxide Polymer Nanocomposite Beads

2021 ◽  
Vol 891 ◽  
pp. 31-36
Author(s):  
Jirah Emmanuel T. Nolasco ◽  
Camille Margaret S. Alvarillo ◽  
Joshua L. Chua ◽  
Ysabel Marie C. Gonzales ◽  
Jem Valerie D. Perez
Keyword(s):  
Graphene Oxide ◽  
Methyl Orange ◽  
Large Scale ◽  
Scale Up ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Design Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Adsorption Column

Continuous fixed-bed column studies were performed using nanocomposite beads made up of chitosan, polyethyleneimine, and graphene oxide as adsorbents for the removal of methyl orange (MO) in water. The effects of different operating parameters such as initial MO concentration (5, 10, and 15 ppm), bed height (10, 17.5, and 25 cm), and flow rate (27, 43, and 58 mL/min) were investigated using an upward-flow fixed-bed column set-up. The breakthrough curves generated were fitted with Adams-Bohart, Thomas, Yoon-Nelson, and Yan et al. models. The results showed that Yan et al. model agreed best with the breakthrough curves having an R2 as high as 0.9917. Lastly, design parameters for a large-scale adsorption column were determined via scale-up approach using the parameters obtained from column runs.

scholarly journals Alternative Materials for the Enrichment of Biogas with Methane

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7759
Author(s):  
Mieczysław Bałys ◽  
Ewelina Brodawka ◽  
Grzegorz Stefan Jodłowski ◽  
Jakub Szczurowski ◽  
Marta Wójcik
Keyword(s):  
Carbon Dioxide ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Waste Utilization ◽  
Raw Material ◽  
Rich Mixture ◽  
Fixed Bed Adsorption ◽  
Alternative Materials ◽  
Breakthrough Experiments ◽  
Coconut Shell Activated Carbon

Carbonaceous adsorbents have been pointed out as promising adsorbents for the recovery of methane from its mixture with carbon dioxide, including biogas. This is because of the fact that CO2 is more strongly adsorbed and also diffuses faster compared to methane in these materials. Therefore, the present study aimed to test alternative carbonaceous materials for the gas separation process with the purpose of enriching biogas in biomethane and to compare them with the commercial one. Among them was coconut shell activated carbon (AC) as the adsorbent derived from bio-waste, rubber tire pyrolysis char (RPC) as a by-product of waste utilization technology, and carbon molecular sieve (CMS) as the commercial material. The breakthrough experiments were conducted using two mixtures, a methane-rich mixture (consisting of 75% CH4 and 25% CO2) and a carbon dioxide-rich mixture (containing 25% CH4 and 75% CO2). This investigation showed that the AC sample would be a better candidate material for the CH4/CO2 separation using a fixed-bed adsorption column than the commercial CMS sample. It is worth mentioning that due to its poorly developed micropore structure, the RPC sample exhibited limited adsorption capacity for both compounds, particularly for CO2. However, it was observed that for the methane-rich mixture, it was possible to obtain an instantaneous concentration of around 93% CH4. This indicates that there is still much potential for the use of the RPC, but this raw material needs further treatment. The Yoon–Nelson model was used to predict breakthrough curves for the experimental data. The results show that the data for the AC were best fitted with this model.

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