A study of the bubble column evaporator method for improved sterilization

Shahid, Muhammad Kashif

doi:10.1016/j.jwpe.2014.10.009

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…When inactivating E.coli (ATCC 15597) with air and nitrogen at 150° C in the HBCE, similar E.coli inactivation results (Fig. 6) were obtained to those reported by Shahid [10], when using natural lake water samples with hot air. The collisions between the hot rising bubbles and coliforms was assumed to be the fundamental mechanism for coliform inactivation in their work [9].…”

Section: Thermal Inactivation Mechanismsupporting

confidence: 87%

Water sterilisation using different hot gases in a bubble column reactor

Garrido

Pashley

Ninham

2018

Journal of Environmental Chemical Engineering

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Section: Thermal Inactivation Mechanismsupporting

confidence: 87%

Water sterilisation using different hot gases in a bubble column reactor

Garrido

Pashley

Ninham

2018

Journal of Environmental Chemical Engineering

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“…The most striking of these we have developed are in desalination. Some of a wide range of other useful applications of the BCE 10 are: a new method for the precise determination of enthalpies of vaporisation (ΔH vap ) of concentrated salt solutions; 7,11 evaporative cooling; 8 a new method for thermal desalination; 12-14 a novel method for sub-boiling thermal sterilization; 7,[15][16][17][18][19] a novel method for the low-temperature thermal decomposition of different solutes in aqueous solution; 3 a new approach to aqueous solute precipitation in a controlled manner. 20 The efficient removal of heavy metal ions in an ionspecific, ion-flotation process is a specially noteworthy advance.…”

Section: Significance Of the Bubble Column Evaporator (Bce)mentioning

confidence: 99%

A Study of the Bubble Column Evaporator Method for Improved Ammonium Bicarbonate Decomposition in Aqueous Solutions: Desalination and Other Techniques

2021

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A bubble column was used to study the improved thermal decomposition of NH4HCO3 in aqueous solution using a continuous flow of hot gas bubbles of optimum sizes (1-3 mm) produced via controlled bubble coalescence to maintain bubble size. The rapid transfer of heat from small, hot (dry) gas bubbles to the surrounding water, i.e. into a transient hot surface layer, was used as an effective and energy efficient method of decomposing ammonium bicarbonate in aqueous solution. It is shown that the continuous flow of (dry) hot gases, even at 275°C, only heat the aqueous solution in the bubble column to about 57°C, at which it was also established that NH4HCO3 has a negligible decomposition rate even with long-term exposure to this solution temperature. Hence, the effects observed appeared to be caused entirely by the effective collisions between the hot gas bubbles and the solute. It was also established that the use of high gas inlet temperatures can reduce the thermal energy requirement to only about 50% (i.e. about 575 kJ/L) of that reported in previous studies and less than 25% of solution boiling.

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“…The inactivation is apparently due to the continuous collisions between the hot surface of the small, heated air bubbles, and the biological organisms dispersed in the solution. 11 During this process the column solution temperature remained well below that usually required to thermally inactivate the microorganisms in solution. The mechanisms involved appear to be related to the initial and transient formation of a relatively thin layer (nanometers) of heated solution around the surfaces of the rising bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…The remarkable phenomenon of bubble coalescence inhibition − in bubble column evaporators (BCEs) opens up a diversity of useful applications. These include, for example, desalination, − sterilization (water/wastewater treatment), − and evaporative cooling . The unexpected effects of some types of concentrated salt solutions on the inhibition of bubble coalescence have been largely unrecognized.…”

Section: Introductionmentioning

confidence: 99%

“…The BCE process was used to inactivate coliforms in solution while maintaining a relatively low column solution temperature. The inactivation is apparently due to the continuous collisions between the hot surface of the small, heated air bubbles, and the biological organisms dispersed in the solution . During this process the column solution temperature remained well below that usually required to thermally inactivate the microorganisms in solution.…”

Section: Introductionmentioning

confidence: 99%

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Study of a Novel Method for the Thermolysis of Solutes in Aqueous Solution Using a Low Temperature Bubble Column Evaporator

et al. 2015

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An enhanced thermal decomposition of chemical compounds in aqueous solution has been achieved at reduced solution temperatures. The technique exploits hitherto unrecognized properties of a bubble column evaporator (BCE). It offers better heat transfer efficiency than conventional heat transfer equipment. This is obtained via a continuous flow of hot, dry air bubbles of optimal (1-3 mm) size. Optimal bubble size is maintained by using the bubble coalescence inhibition property of some salts. This novel method is illustrated by a study of thermal decomposition of ammonium bicarbonate (NH4HCO3) and potassium persulfate (K2S2O8) in aqueous solutions. The decomposition occurs at significantly lower temperatures than those needed in bulk solution. The process appears to work via the continuous production of hot (e.g., 150 °C) dry air bubbles, which do not heat the solution significantly but produce a transient hot surface layer around each rising bubble. This causes the thermal decomposition of the solute. The decomposition occurs due to the effective collision of the solute with the surface of the hot bubbles. The new process could, for example, be applied to the regeneration of the ammonium bicarbonate draw solution used in forward osmosis.

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A study of the bubble column evaporator method for improved sterilization

Cited by 8 publications

References 17 publications

Water sterilisation using different hot gases in a bubble column reactor

Water sterilisation using different hot gases in a bubble column reactor

A Study of the Bubble Column Evaporator Method for Improved Ammonium Bicarbonate Decomposition in Aqueous Solutions: Desalination and Other Techniques

Study of a Novel Method for the Thermolysis of Solutes in Aqueous Solution Using a Low Temperature Bubble Column Evaporator

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