Removal of nickel from water using rotating packed bed contactor: Parametric studies and mode of operations

Ng, Yee Sern; Tan, Yee Tong; Chua, Adeline Seak May; Hashim, Mohd Ali; Sengupta, Bhaskar

doi:10.1016/j.jwpe.2020.101286

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…This increase in performance is assumed to be due to the lateral shear of the reactor causing enhanced mixing between the fluid and the resin, increasing the adsorption kinetics from the purely diffusion limited rate attainable in the static columns. Similar enhancements in mass transfer have been evidenced in high centrifuge rotating bed reactors [50,51]; however, the ATR has the advantage that the column residence times can be easily independently controlled, giving additional operational flexibility and control for this type of intensified system.…”

Section: Ion Exchange Performance Using An Agitated Tubular Reactor (mentioning

confidence: 59%

“…One of the most prevalent examples in the literature is rotating bed reactors (RBRs), which were originally designed for gas-liquid separation operations, where high centrifugal gravity fields lead to enhanced mass transfer characteristics [33]. More recently, they have also been utilised for the removal of contaminants from liquids, including dyes, fertilisers, and heavy metals [47][48][49][50][51]. However, the disadvantage of RBRs is that they have relatively small residence times which are dependent on the rotation speed, and thus, for the high percentage removal of species, effluent requires multiple passes.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

et al. 2021

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Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

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Section: Ion Exchange Performance Using An Agitated Tubular Reactor (mentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

et al. 2021

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“…(c) Examination of the intensification by replacing the conventional equipment with RPBs, such as deoxygenation of water and fuel [46,47], wastewater treatment [48], CO 2 absorption [49], and selective absorption [50]. (d) Focusing on the micro-scale or micro-mixing in a heat-sensible process, controlling polymerization processes, and packing optimization [51].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mass Transfer Intensification for CO2 Capture by Environment-Friendly Water Based Nanofluid Solvents in a Rotating Packed Bed

2022

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In this research, two intensification approaches for CO2 capture via a rotating packed bed (RPB) and nanofluids were examined simultaneously to maximize the experimental mass transfer coefficient. The two intensification approaches were done by using water as a green, environmentally friendly absorption solvent and as the base fluid for preparing nanofluids and also by using centrifugal acceleration in an RPB. Physicosorption of CO2 in an RPB was carried out by applying Al2O3, TiO2, and SiO2 nanofluids to intensify the mass transfer in water, and the operation parameters such as the angular speed of the rotor, concentration and type of nanoparticles, gas and liquid flow rates, and CO2 concentration in mass transfer intensification were evaluated and several nanofluids were selected to survey investigate how they affect the mass transfer at low pressure. The results show that the Al2O3 nanofluid was more effective than other nanofluids and that the 40 nm nanofluid of this type was more efficient than the 20 nm size. Therefore, a correlation is proposed in this paper for liquid volumetric mass transfer coefficient prediction that includes the microconvection of nanoparticles and surface tension.

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“…Ng et al investigated the performance of a rotating packed bed (RPB) contactor for nickel removal from water in terms of operating parameters and mode. They showed that the rotational speed and mode of operation had significant effects on nickel adsorption performance [10]. Du et al prepared ion-imprinted composite membranes for the selective electrochemical removal of heavy metal ions from wastewater.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Brush Plate Structure and Operating Parameters on the Energy Consumption of Electrolytic Cells

Yi¹,

Yang²,

Zhou³

et al. 2021

Processes

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The nickel powder brush plate is a core component of the direct contact between the cleaning machine and cathode plate of an electrolyzer, and its movement in the electrolytic cell will affect the energy consumption of the electrolyzer. In order to optimize the structure of the brush plate, a cleaning trolley brush plate was taken as the research object, a mathematical model of its electrolyzer was established, and the reliability was subsequently verified. The influence of the structural and operating parameters of the brush plate on the energy consumption of the electrolytic cell was studied. The research results show that additional energy consumption is the lowest in the process of cleaning a return grooved brush plate. Brush plates with a large slotting area have less impact on the energy consumption of the electrolyzer. The slotting method, where the anodes are arranged directly opposite each other and relatively concentrated, can be adapted to render a more uniform current density distribution on the anode surface, with lower energy consumption and less variation in voltage and current. With the increasing number of slots from one to three, the current density distribution on the anode surface became more uniform, with a reduction in the variation range of the slot voltage and current in the branch where the cathode plate was cleaned and a decreased energy consumption. With the linear increase in brush cleaning speed, the impact time of the brush plate on the electrolyzer decreased nonlinearly, and as the extent of this decrease gradually diminished, the additional energy consumption showed the same trend. These research results were then used as a basis for optimizing the existing commonly used empirical C-brush plates. Following optimization, the current density distribution on the anode surface was found to be more uniform, the variation amplitude of tank voltage was reduced by 34%, the current drop amplitude of the branch circuit where the brushed cathode plate was located was reduced by 39%, the impact time on the current field of the electrolytic tank was reduced by 40%, and the additional energy consumption was reduced by 50.9%. These results can be served as a reference for further theoretical research related to brush plates.

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Removal of nickel from water using rotating packed bed contactor: Parametric studies and mode of operations

Cited by 9 publications

References 26 publications

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)

Experimental Investigation of Mass Transfer Intensification for CO2 Capture by Environment-Friendly Water Based Nanofluid Solvents in a Rotating Packed Bed

The Effect of Brush Plate Structure and Operating Parameters on the Energy Consumption of Electrolytic Cells

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