Impact of turbine impeller blade inclination on the batch sorption process

Bašić, Anita; Penga, Željko; Mužek, Mario Nikola; Svilović, Sandra

doi:10.1016/j.rineng.2022.100554

Cited by 4 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All experiments were performed in an uncovered glass batch reactor (Figure 1a) with four baffles arranged at a 90 • angle around the reactor periphery [2,16,17]. The batch reactor geometry parameters are listed in Table 1.…”

Section: Batch Reactormentioning

confidence: 99%

“…Pollution of the environment by heavy metal ions, such as copper, cobalt or nickel, is a severe problem since metals do not degrade into harmless end products but tend to accumulate in the environment [1]. Contamination of water and wastewater with heavy metals is the result of various activities such as metal plating, mining and agriculture [2]. Standard techniques for the heavy metal ions removal from aqueous effluents include precipitation, electroplating, evaporation, membrane separation and sorption [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Number of research studies have been conducted to study the removal of metals, including copper, from the environment. Often these studies are based on the metal sorption on various sorbents such as clays, composite carbon-silica, magnetic materials, fly ash and synthetic or natural zeolites [1, 2,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…According to the literature, despite the importance of hydrodynamic conditions for sorption in batch reactors this effect has received insufficient attention. Apart from a few articles, the effect of mixing parameters on sorption kinetics is studied only in terms of mixing speed, neglecting all other variables related to hydrodynamics in a batch reactor [2,[16][17][18][19]. To avoid film diffusion as a rate-determining step in sorption processes, the boundary layer surrounding the particles needs to be greatly reduced [20].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Zeolite NaX Mass and Propeller Agitator Speed Impact on Copper Ions Sorption

Bašić

Penga

et al. 2023

Processes

Self Cite

View full text Add to dashboard Cite

Sorption is often carried out in stirred batch reactors without any consideration of how much mixing is sufficient to avoid the effect of diffusion without compromising yield and cost due to overmixing. Therefore, the focus of this work was to study how the maximum sorption capacity, removal efficiency, kinetics and power consumption (P) of the studied process are affected by different mixing speeds, i.e., impeller speed/minimum impeller speed for complete suspension (N/NJS) ratio values and zeolite suspension mass concentrations. Experiments were conducted in a baffled reactor with the propeller at a standard off-bottom clearance. In addition to the experimental studies, numerical modelling approaches were carried out to investigate the sorption process using a transient multiphase computational fluid dynamics model and fitting selected kinetic models. The results show that an increase in zeolite mass leads to a slight increase in the NJS and consequently PJS. The impeller speed affects the velocities, power consumption, kinetics, final amount and removal efficiency of copper sorbed. The experimentally determined kinetic data fit Ritchie’s kinetic model well. However, for two experiments, performed at N/NJS ratios of 0.8 and 0.6, Mixed kinetic model fits better, suggesting that the second-order reaction is suppressed by diffusion. Due to the influence of diffusion, the experimentally determined sorption efficiency decreased from 59.377% to 54.486% and 46.372% for N/NJS ratios of 0.8 and 0.6, respectively.

show abstract

Section: Batch Reactormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Zeolite NaX Mass and Propeller Agitator Speed Impact on Copper Ions Sorption

Bašić

Penga

et al. 2023

Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…3,23,24 While the effects of reactor geometry on hydrodynamic conditions and consequently on sorption kinetics, efficiency, and costs did not attract much interest, it was found that reactor geometry indeed affects sorption kinetics, yield, and costs. [25][26][27][28][29] Therefore, the aim of this work was to analyse the hydrodynamic conditions generated by varying the zeolite mass and the presence of baffles, and to investigate their influence on the kinetics and efficiency of copper sorption. To visualise the hydrodynamic conditions in the reactor, the system's behaviour was simulated using ANSYS Fluent v17.2.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaX Zeolite Mass and Baffle Presence on Copper Sorption

Herceg,

Bašić,

Penga

et al. 2024

Kem. ind. (Online)

View full text Add to dashboard Cite

Sorption is often conducted in stirred batch reactors without assessing the impact of mixing on yield and costs. Operating the mixing in the batch reactor at a state of complete suspension, i.e., at just suspended impeller speed, N JS , is a compromise between these conflicting goals. Therefore, copper sorption on NaX zeolite using a pitched blade turbine was conducted in both baffled and unbaffled batch reactors at N JS . Maintaining constant impeller to reactor diameter ratio (D/d T = 0.32), and impeller off-bottom clearance (C/H = 0.33), kinetic sorption experiments were performed. Besides kinetic sorption experiments and the kinetic analysis of data obtained, to gain insight into the hydrodynamic behaviour of the system, transient multiphase computational fluid dynamics simulations (CFD) were performed. The N JS speed is related to the particle settling speed, wherein a higher zeolite suspension mass concentration requires a greater N JS speed, resulting in increased energy consumption. The differences in N JS speeds for the investigated zeolite suspension mass concentrations were found to be insubstantial, and therefore, the increase in mixing intensity for the tested systems was not deemed significant. Regardless of the zeolite mass used, the values of N JS and P JS (mixing power consumption) were consistently higher in the unbaffled reactor. The hydrodynamic conditions employed were found to have no significant effect on the maximum amount of copper sorbed or process efficiency, but was significantly affected by zeolite mass. The kinetics were affected by both, and, generally, sorption occurred faster in the unbaffled reactor.

show abstract