A novel acoustic approach for the characterization of granular activated carbons used in the rum production

Sariol, Harold Crespo; Yperman, Jan; Sauvanell, Ángel Brito; Carleer, Robert; Campa, José Navarro; Gryglewicz, Grażyna

doi:10.1016/j.ultras.2016.03.021

Cited by 8 publications

(19 citation statements)

References 15 publications

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“…This paper gives an improved approach of earlier findings [7,8], describing a new method for the characterization of activated carbons based on flooding a GAC sample with water. It results in a sound emission by bubbles escaping through the bulk water and exploding at the liquid surface.…”

Section: Introductionmentioning

confidence: 99%

“…The GAC sound is produced by the bubbles escaping from the GAC cracks and pores when water molecules occupy the air-filled voids inside of the GAC by displacing the present air. The amount of produced bubbles is closely related to the porosity of the GAC [7]. The bubble volume fraction and rate at which the bubbles appear by approaching the water surface influence sound parameters as frequency and signal amplitude [7,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The amount of produced bubbles is closely related to the porosity of the GAC [7]. The bubble volume fraction and rate at which the bubbles appear by approaching the water surface influence sound parameters as frequency and signal amplitude [7,[9][10][11][12][13]. The acoustic emission (AE) produced in audible spectra can be analyzed by a proper acoustic signal analysis technique.…”

Section: Introductionmentioning

confidence: 99%

“…The use of acoustic measurements makes it possible to determine the overall porosity, but also to characterize the porous structure of GAC according to the sound patterns obtained. The acoustic emission of different samples of activated carbons used in the rum production process were studied by applying a non-professional set-up; it was observed that the best correlation between GAC parameters, S BET and total volume of pores with the acoustic measurements were obtained when the signal is processed at 1 kHz [7]. Bubbles and its corresponding sound patterns are, in general, widely studied, theoretically analyzed and applied in many scientific fields.…”

Section: Introductionmentioning

confidence: 99%

“…Recorded data can be correlated with GAC properties and more specific in the determination of its exhaustion degree. In this work, the set-up presented in [7] is improved in terms of signal acquisition devices, measurement chain and the applied signal processing by using MATLAB ® , following a similar way to process the acoustic signal as is presented in [22,23] allowing a better characterization of the GAC acoustic emission phenomenon and its features. More accurate correlation with the GAC characteristics can now be demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study between Acoustic Emission Analysis and Immersion Bubble-Metric Technique, TGA and TD-GC/MS in View of the Characterization of Granular Activated Carbons Used in Rum Production

et al. 2017

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Microscopic and acoustic emission analysis and sound patterns recognition techniques were applied for the characterization of granular activated carbon (GAC). A new and improved methodology has been developed to characterize the exhaustion degree of GAC used in rum production: (1) based on the acoustic emission analysis of the sound produced by water flooded on GAC; and (2) based on the microscopic analysis of bubbles formed by immersion into glycerol. Acoustic measurements are made in a specific setup , bubble detection and analysis is performed using dedicated software developed in MATLAB ® for circular shape pattern detection based on the Hough transform. Both have been correlated with data of GAC characteristics based on thermogravimetric analysis (TGA) and Thermal Desorption-Gas Chromatography Mass Spectrometry (TD-GC/MS). Eight samples of GAC used in the rum production, obtained at different depths within the fixed-bed filter, have been evaluated. Good correlations are found between the immersion "bubble-metric" technique and the acoustic measurement data from the original signal processed by Band-Pass (BP) filtering at 1.3 kHz and weight loss amounts of adsorbed compounds on the GAC. The found relationship gives the possibility to determine the exhaustion degree of GAC applying these methods and to evaluate high-porosity materials.

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Section: Introductionmentioning

confidence: 99%