Design and scaling up of fixed bed adsorption columns for lead removal by treated laterite

Chatterjee, Somak; Mondal, Sourav; De, Sirshendu

doi:10.1016/j.jclepro.2017.12.249

Cited by 87 publications

(26 citation statements)

References 27 publications

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“…2016; Chatterjee et al, 2018;Jin et al, 2018). Furthermore, as shown in Figure 7, increasing flowrate led to an increase in kK for all materials.…”

Section: Effects Of Flowrate On H + Uptake Capacities and Ratesmentioning

confidence: 64%

“…Flowrate is an important parameter to evaluate the efficiency of ion exchange materials in a continuous process because contact time and column hydrodynamics [i.e., Reynolds number (Re)] can impact IEX capacities and rates (Cooper, 1965;Barros et al, 2004;Borba et al, 2006;Chatterjee et al, 2018). The effect of varying flow rate on H + saturation capacities and ion exchange rate parameters were probed using saturated CO 2 (1.0 atm CO 2 ; pH 3.9) feed solutions at flow rates ranging from 20-160 ccm (Re 0.3-19.4).…”

Section: Effects Of Flowrate On H + Uptake Capacities and Ratesmentioning

confidence: 99%

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Implementation of Ion Exchange Processes for Carbon Dioxide Mineralization Using Industrial Waste Streams

et al. 2020

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Sequestration of CO2 within stable mineral carbonates (e.g., CaCO3) represents an attractive emission reduction strategy because it offers a leakage-free alternative to geological storage of CO2 in an environmentally benign form. However, the pH of aqueous streams equilibrated with gaseous streams containing CO2 (pH < 4) are typically lower than that which is required for carbonate precipitation (pH > 8). Traditionally, alkalinity is provided by a stoichiometric reagent (e.g., NaOH) which renders these processes environmentally hazardous and economically unfeasible. This work investigates the use of regenerable ion-exchange materials to induce alkalinity in CO2-saturated aqueous solutions such that the pH shift required for mineralization occurs without the need for stoichiometric reagents. Na+-H+ exchange isotherms (at [H+] = 10−8–10−1 M) and rates were measured for 13X and 4A zeolites and TP-207 and TP-260 organic exchange resins in batch equilibrium and fixed-bed exchange experiments, respectively. At solutions equilibrated with CO2 at 1.0 atm (pH = 3.9), H+ exchange capacities for the materials were similar (1.7–2.4 mmol H+/g material) and resulted in pH increases from 3.9 to greater than 8.0. Multi-component mixtures using Ca2+ and Mg2+ cations (at 10−3–10−1 M) in CO2-saturated water were used to probe competitive ion exchange. The presence of divalent cations in solution inhibited H+ exchange, reducing capacities to as low as 0.2 mmol H+/g for both resins and zeolites. Dynamic H+ exchange capacities in fixed-bed ion exchange columns were similar to equilibrium values for resins (∼1.5 mmol/g) and zeolites (∼0.8 mmol/g) using inlet solutions that were equilibrated with gaseous streams of CO2 at 1.0 atm. However, exchange kinetics were limited by intraparticle diffusion as indicated by the increased rate parameters with increasing inlet flow rates (20–160 cm3 min−1). Experimental calcite precipitation from mixing the alkaline CO32−-rich water solution obtained from the ion-exchange column with a simulated liquid waste stream solution achieved thermodynamic maximum yields. The results from these studies indicate that ion exchange processes can be used as an alternative to the addition of stoichiometric bases to induce alkalinity for the precipitation of CaCO3, thereby opening a pathway toward sustainable and economic mineralization processes.

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“…2016; Chatterjee et al, 2018;Jin et al, 2018). Furthermore, as shown in Figure 7, increasing flowrate led to an increase in kK for all materials.…”

Section: Effects Of Flowrate On H + Uptake Capacities and Ratesmentioning

confidence: 64%

Section: Effects Of Flowrate On H + Uptake Capacities and Ratesmentioning

confidence: 99%

Implementation of Ion Exchange Processes for Carbon Dioxide Mineralization Using Industrial Waste Streams

et al. 2020

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“…Apart from this, the length of the fixed bed where adsorption of solutes takes place is defined as mass transfer zone (MTZ), and its calculation was shown in Eq. 3 (Chatterjee et al 2017;Vieira et al 2019).…”

Section: Continuous Phosphate Adsorptionmentioning

confidence: 99%

The adsorption of phosphate using a magnesia–pullulan composite: kinetics, equilibrium, and column tests

Jiao²,

Kang

et al. 2019

Environ Sci Pollut Res

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Amagnesia-pullulan (MgOP) composite has been developed to remove phosphate from a synthetic solution. In the present study, the removal of phosphate by MgOP was evaluated in both a batch and dynamic system. The batch experiments investigated the initial pH effect on the phosphate removal efficiency from pH 3 to 12 and the effect of co-existing anions. In addition, the adsorption isotherms, thermodynamics, and kinetics were also investigated. The results from the batch experiments indicate that MgOP has encouraging performance for the adsorption of phosphate, while the initial pH value (3-12) had a negligible influence on the phosphate removal efficiency. Analysis of the adsorption thermodynamics demonstrated that the phosphate removal process was endothermic and spontaneous. Investigations into the dynamics of the phosphate removal process were carried out using a fixed bed of MgOP, and the resulting breakthrough curves were used to describe the column phosphate adsorption process at various bed masses, volumetric flow rates, influent phosphate concentrations, reaction temperatures, and inlet pH values. The results suggest that the adsorption of phosphate on MgOP was improved using an increased bed mass, while the reaction temperature did not significantly affect the performance of the MgOP bed during the phosphate removal process. Furthermore, higher influent phosphate concentrations were beneficial towards increasing the column adsorption capacity for phosphate. Several mathematic models, including the Adams-Bohart, Wolboska, Yoon-Nelson, and Thomas models, were employed to fit the fixed-bed data. In addition, the effluent concentration of magnesium ions was measured and the regeneration of MgOP investigated.

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“…The second integral corresponds to the time of the dimensionless concentration profile (sigmoidal curve) of the mass transfer zone (MTZ). MTZ is defined as the region of the fixed bed that is unsaturated [ 31 ]. The MTZ is constant as it travels through the column, if and only if, the length of the column is sufficient to contain a transfer zone in the steady state [ 32 , 33 ].…”

Section: Methodsmentioning

confidence: 99%

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

et al. 2020

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The removal of Cu(II) ions from aqueous solutions at a pH of 5.0 was carried out using fixed-bed columns packed with alginate-chitosan (Alg-Ch) or alginate-chitosan sulfate (Alg-ChS) hydrogel beads. The effect of the initial Cu(II) concentration, flow rate, pH, and height of the column on the amount of Cu removed by the column at the breakpoint and at the exhaustion point is reported. The pH of the solution at the column’s exit was initially higher than that at the entrance, and then decreased slowly. This pH increase was attributed to proton transfer from the aqueous solution to the amino and COO− groups of the hydrogel. The effect of operating conditions on the mass transfer zone (MTZ) and the length of the unused bed (HLUB) is reported. At the lower flow rate and lower Cu(II) concentration used, the MTZ was completely developed and the column operated efficiently; by increasing column height, the MTZ has a better opportunity to develop fully. Experimental data were fitted to the fixed-bed Thomas model using a non-linear regression analysis and a good correspondence between experimental and Thomas model curves was observed.

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Design and scaling up of fixed bed adsorption columns for lead removal by treated laterite

Cited by 87 publications

References 27 publications

Implementation of Ion Exchange Processes for Carbon Dioxide Mineralization Using Industrial Waste Streams

Implementation of Ion Exchange Processes for Carbon Dioxide Mineralization Using Industrial Waste Streams

The adsorption of phosphate using a magnesia–pullulan composite: kinetics, equilibrium, and column tests

Removal of Cu(II) by Fixed-Bed Columns Using Alg-Ch and Alg-ChS Hydrogel Beads: Effect of Operating Conditions on the Mass Transfer Zone

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