Acoustic cavitation for agri-food applications: Mechanism of action, design of new systems, challenges and strategies for scale-up

Zhu, Xianglu; Das, Rahel Suchintita; Bhavya, Mysore Lokesh; Garcia-Vaquero, Marco; Tiwari, Brijesh K.

doi:10.1016/j.ultsonch.2024.106850

Cited by 8 publications

(5 citation statements)

References 119 publications

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“…Piezoelectric sensors (7) were connected to the data acquisition system, composed of NI9219 module within NI cDAQ 9172 chassis, controlled by LabVIEW ® program (8) dedicated to data acquisition, treatment, and signal processing. The system and LabVIEW ® program were developed specifically for this study.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Studying and monitoring acoustic cavitation, mainly transient cavitation in water, involves two main mechanisms. According to Verhaagen et al [6] and Zhu et al [7], the measurements of cavitation phenomena can be distinguished based on primary or secondary effects of acoustic cavitation. Primary effects include pressure and temperature, while the measurement of secondary effects relies on chemical and physical methods based on measurements of the formation of radicals, oxidation reactions, electrochemical effects, and mass transfer coefficients [7].…”

Section: Introductionmentioning

confidence: 99%

“…These hydrophones enable real-time monitoring and serve as the cornerstone of cavitometers used in industrial applications [31]. Their utilization allows for assessing acoustic field distribution in ultrasound chambers, applicable across laboratory and large-scale environments [7]. However, their bulk sensor design may disrupt the acoustic field.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, achieving real-time measurements often necessitates signal conversion to Fast Fourier Transform (FFT) or specialized data acquisition software, increasing complexity and cost. Furthermore, immersing hydrophones in ultrasound chambers poses a risk of damage from cavitation activity [7].…”

Section: Introductionmentioning

confidence: 99%

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Unveiling Acoustic Cavitation Characterization in Opaque Chambers through a Low-Cost Piezoelectric Sensor Approach

Fernandes,

Ramísio,

Puga

2024

Electronics

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This study investigates the characterization of acoustic cavitation in a water-filled, opaque chamber induced by ultrasonic waves at 20 kHz. It examines the effect of different acoustic radiator geometries on cavitation generation across varying electrical power levels. A cost-effective piezoelectric sensor, precisely positioned, quantifies cavitation under assorted power settings. Two acoustic radiator shape configurations, one with holes and another solid, were examined. The piezoelectric sensor demonstrated efficacy, corroborating with existing literature, in measuring acoustic cavitation. This was achieved through the Fast Fourier Transform (FFT) analysis of voltage data, specifically targeting sub-harmonic patterns, thereby providing a robust method for cavitation detection. Results demonstrate that perforated geometries enhance cavitation intensity at lower power levels, while solid shapes predominantly affect cavitation axially, exhibiting decreased activity at minimal power. The findings recommend using two different shape geometries on the acoustic radiator for efficient cavitation detection, highlighting intense cavitation on radial walls and cavitation generation on the bottom. Due to the stochastic nature of cavitation, averaging data is critical. The spatial limitation of the sensor necessitates prioritizing specific areas over complete coverage, with multiple sensors recommended for comprehensive cavitation pattern analysis.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unveiling Acoustic Cavitation Characterization in Opaque Chambers through a Low-Cost Piezoelectric Sensor Approach

Fernandes,

Ramísio,

Puga

2024

Electronics

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“…Due to the large amount of products that pass through it, the wash water may be enriched by unusually high concentrations of organic matter, causing changes in its physical-chemical characteristics. A variety of studies have been able to demonstrate high concentrations of organic matter that hinder the inhibition of the microorganisms present in Process WasteWater (PWW), preventing the action of the disinfection treatments used in the agri-food industry [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Antimicrobial Efficacy of Low-Cost Commercial Disinfectants Utilized in the Agro-Food Industry Wash Tanks: Towards Enhanced Hygiene Practices

Chalen-Moreano,

Saeteros-Hernández,

Abdo-Peralta

et al. 2024

Foods

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The increase in vegetable consumption has underlined the importance of minimizing the risks associated with microbiological contamination of fresh produce. The critical stage of the vegetable washing process has proven to be a key point for cross-contamination and the persistence of pathogens. In this context, the agri-food industry has widely adopted the use of disinfectants to reduce the bacterial load in the wash water. Therefore, we conducted laboratory-scale experiments in order to demonstrate the antimicrobial activity of disinfectants used in the wash tank of agro-food industries. Different wash water matrices of shredded lettuce, shredded cabbage, diced onion, and baby spinach were treated with sodium hypochlorite (NaClO), chlorine dioxide (ClO2), and per-oxyacetic acid (PAA) at recommended concentrations. To simulate the presence of pathogenic bacteria, a cocktail of E. coli O157:H7 was inoculated into the process water samples (PWW) to determine whether concentrations of disinfectants inhibit the pathogen or bring it to a viable non-culturable state (VBNC). Hereby, we used quantitative qPCR combined with different photo-reactive dyes such as ethidium monoazide (EMA) and propidium monoazide (PMA). The results indicated that concentrations superior to 20 ppm NaClO inhibit the pathogen E. coli O157:H7 artificially inoculated in the process water. Concentrations between 10–20 ppm ClO2 fail to induce the pathogen to the VBNC state. At concentrations of 80 ppm PAA, levels of culturable bacteria and VBNC of E. coli O157:H7 were detected in all PWWs regardless of the matrix. Subsequently, this indicates that the recommended concentrations of ClO2 and PAA for use in the fresh produce industry wash tank do not inhibit the levels of E. coli O157:H7 present in the wash water.

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Ultrasound-assisted extraction of alginate from Ecklonia maxima with and without the addition of alkaline cellulase – factorial and kinetic analysis

van Sittert,

Lufu,

Mapholi

et al. 2024

J Appl Phycol

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Ultrasound-assisted extraction and enzyme-assisted extraction are two methods that can be employed to recover valuable compounds from seaweeds at milder operating conditions than conventional chemical extraction methods. The aim of the study was to determine whether pH, enzyme addition and extraction temperature significantly impacted extraction of alginate from Ecklonia maxima in the presence of ultrasonication and to model extraction kinetics. Firstly, a 23 factorial experimental design was employed at constant sonication rate, with pH (8 and 10), temperature (50 and 60 °C), and enzyme-to-substrate ratio (E:S 0 and 1 %) as the independent variables. Secondly, extraction kinetics of alginate were investigated at different extraction conditions, through fitting of the Peleg and Power models. Highest extraction for alginate was achieved at pH 10, 60 °C, E:S = 0 % within the first 60 min of extraction. The addition of enzyme improved solubilised dry matter content, but it had a less clear impact on the alginate yield. Both the Peleg (R2 = 0.893 – 0.997) and Power function (R2 = 0.861 – 0.987) models provided good fit to the experimental data and can used to describe extraction kinetics of alginate during combined ultrasound-enzymatic assisted extraction.

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Acoustic cavitation for agri-food applications: Mechanism of action, design of new systems, challenges and strategies for scale-up

Cited by 8 publications

References 119 publications

Unveiling Acoustic Cavitation Characterization in Opaque Chambers through a Low-Cost Piezoelectric Sensor Approach

Unveiling Acoustic Cavitation Characterization in Opaque Chambers through a Low-Cost Piezoelectric Sensor Approach

Exploring the Antimicrobial Efficacy of Low-Cost Commercial Disinfectants Utilized in the Agro-Food Industry Wash Tanks: Towards Enhanced Hygiene Practices

Ultrasound-assisted extraction of alginate from Ecklonia maxima with and without the addition of alkaline cellulase – factorial and kinetic analysis

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