Ice growth on the cooling surface in a jacketed and stirred eutectic freeze crystallizer of aqueous Na 2 SO 4 solutions

Hasan, Mehdi; Filimonov, Roman; Chivavava, Jemitias; Sorvari, Joonas; Louhi-Kultanen, Marjatta; Lewis, Alison

doi:10.1016/j.seppur.2016.10.014

Cited by 34 publications

(9 citation statements)

References 31 publications

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“…In suspension freeze crystallization, the solution is frozen in an agitated vessel by circulating the coolant through the jacket. Below the freezing temperature of the solution, ice crystals are generated from the solution, which are then separated discuss different factors that influence ice‐scaling on the cooling surface of the freeze crystallizer. Scrapers are commonly used in the crystallizer to thwart ice scaling on the subcooled surface, which may reduce the heat transfer rate drastically.…”

Section: Introductionmentioning

confidence: 99%

Influence and CFD analysis of cooling air velocity on the purification of aqueous nickel sulfate solutions by freezing

et al. 2017

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in Wiley Online Library (wileyonlinelibrary.com)Finite energy resources and their rapidly waning imprint necessitate a sustainable wastewater treatment method. Nature could be exploited to freeze wastewater in locations which experience subzero temperatures during winter. The two most vital components that influence the efficiency of natural freezing are the ambient temperature and air velocity. The turbulent and unsteady air-cooled natural freezing is simulated for ice crystallization from 0.1 wt % and 1 wt % NiSO 4 (aq) solutions. The efficiency of natural freezing is tested for different air velocities (2 ms 21 , 5 ms 21 ) and levels of undercooling (DT 5 0.58C, 18C) from the freezing temperature of the corresponding solution. The airflow in the winter simulator is modeled by computational fluid dynamics to investigate its behavior and to assess its effect on freezing.Symbol: • and -represents freezing test results with v 5 0.25 ms 21 and the linear relationship between G and K as obtained in our previous publication. 5 Symbol: o, represents freezing test results in the current setup as shown in Figure 1 with v 5 2 ms 21 ; 1, with v 5 5 ms 21 and *, with v 5 5.5 ms 21 after subduing the effect of vibration.

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Section: Introductionmentioning

confidence: 99%

Influence and CFD analysis of cooling air velocity on the purification of aqueous nickel sulfate solutions by freezing

et al. 2017

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“…According to our previous research [1] and the results obtained by Erlbeck et al [2],Yin et al [3] and Williams et al [4], freeze crystallization has many of the attributes needed for efficient and cost effective wastewater treatment. Environmental friendliness is a key benefit, because the freezing process needs no added chemicals, no more waste is generated (as filter media), and toxic waters can be treated.…”

Section: Introductionmentioning

confidence: 90%

“…Previous research concerning suspension freeze crystallizers has often been performed using model or artificial waters instead of real wastewaters and mostly in the laboratory. Moreover, these experiments usually utilize eutectic freeze crystallization (EFC), and they focus more on investigating process parameters and crystal size than on examining purification efficiencies in terms of ice purity [1,9,10]. Experiments conducted on a larger scale are more often carried out using the EFC technique and with industrial effluents or brines as concluded from reviews of freeze crystallization for desalination [3] and reverse osmosis brine treatments [11].…”

Section: Introductionmentioning

confidence: 99%

Impurity separation efficiency of multi-component wastewater in a pilot-scale freeze crystallizer

John

Choudhury

Filimonov

et al. 2020

Separation and Purification Technology

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“…Research into EFC techniques currently revolves around the "Scraped Cooled Wall Crystallizer" (SCWC) design developed in 2008. [20,30,35] One interesting advantage of EFC is its ability to selectively remove salts from a solution at their respective eutectic temperatures. [2] At the present time, experimental results are promising, and simulations suggest that the use of Scraped-Cooled Wall Crystallizers are suitable for process implementation.…”

Section: Indirect Freezingmentioning

confidence: 99%

Water recovery from inorganic solutions via natural freezing and melting

Shum

Papangelakis

2019

Journal of Water Process Engineering

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MMXVII AbstractA combined natural freezing and melting water recovery process was evaluated for a 0.5 molal magnesium sulphate solution. 500 mL of solution was placed in a container open to the air, and the temperature was lowered to between -2 and -26 °C. At equilibrium the solid produced, consisting of ice and entrapped solution or solute crystals, was removed and thawed at either 3 °C or 25 °C. The resulting liquid was analysed for magnesium. Microscopy of the solid was also performed. Although the purity of the liquid was not affected by the thawing temperature, solid frozen at -26 °C yielded the best purity when melted, as 40% of the original water could be recovered at a concentration of 0.075 molal magnesium sulphate. This is because during melting entrapped solution drains from the solid faster than the ice melts, increasing liquid concentration at earlier stages of melting.iii Acknowledgements I would like to thank my supervisor, Professor Vladimiros G. Papangelakis, for his patience and support over not just the two years of this MASc program, but the four years in which I have been a researcher in his laboratory. I would also like to thank Professor Donald W. Kirk and Professor Nikolai DeMartini for agreeing on such short notice to participate in my thesis committee at an extremely busy time of year. Their wisdom and sagacity are as much appreciated as they are necessary.

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Ice growth on the cooling surface in a jacketed and stirred eutectic freeze crystallizer of aqueous Na 2 SO 4 solutions

Cited by 34 publications

References 31 publications

Influence and CFD analysis of cooling air velocity on the purification of aqueous nickel sulfate solutions by freezing

Influence and CFD analysis of cooling air velocity on the purification of aqueous nickel sulfate solutions by freezing

Impurity separation efficiency of multi-component wastewater in a pilot-scale freeze crystallizer

Water recovery from inorganic solutions via natural freezing and melting

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