Identification of acoustic fields in aqueous biomass solutions of banana waste pretreated by power ultrasound

Abstract

High-intensity ultrasound is a technology used to improve the performance of processes in the chemical, pharmaceutical, biomass pretreatment, and food industries. However, few studies were described in the literature to comprehend the acoustic wave propagation in the material and their efficiency in the process. Thus, this study aims to determine the acoustic fields of aqueous biomass solutions from flower stalk banana using the calorimetric method and a determined sonotrode position. These tests were conducted at temperatures from 0 to 60°C and ultrasound power from 120, 160, to 320 W. Also, the specific heat capacity and density of the solution were determined experimentally as a function of the solution concentration (0.040 to 0.100 g biomass mL −1), pH (3, 5, and 7), and temperature. The position of the thermocouple was maintained at 1 cm from the sonotrode, and the ultrasound frequency was 24 kHz. The methods and results presented in this study can be used to reproduce acoustic field calculations in aqueous biomass solutions, aiming the construction of acoustic processor systems.

Thermophysical properties of dilute acid slurries of cassava bagasse as a function of biomass loading, acid concentration, and temperature

“…Table 2 shows the results, which varied from 986.5 up to 1,029.3 kg∙m −3 . These data are in close agreement with the ones published in the literature for acid slurries containing different biomasses as peanut shells 30 and banana waste 31 …”

“…These data are in close agreement with the ones published in the literature for acid slurries containing different biomasses as peanut shells 30 and banana waste. 31 In general, solids content affected density values more intensely than temperature and acid concentration. Taking into account the influence of each variable on the response, a significant linear effect of temperature, acid and biomass concentration was observed.…”

Comparison between Thin-Layer Models and Non-Traditional Methods in the Modelling of Drying Kinetics of Crustacean Wastes

“…Vol.64: e21210130, 2021, www.scielo.br/babt drying temperature, amongst others. Some studies applied to microwave and air drying processes [25], biological processes [48], to the identification of acoustic fields in lignocellulose biomass [24] and the production of total and reducing sugars [36] pre-treated with power ultrasound, explored the SRG method and obtained well-fitting models. Thus, in the present research, the use of fitting methodologies such as SRG and ANNs was recommended to describe the behavior of the water content as a function of the temperature and drying time.…”

“…However, not all models present good performance, in many cases the description of drying rates depends on interrelated phenomena such as capillarity, diffusion and heat transport, in a complex way. In order to improve the performance of drying kinetic modelling, new methodologies, such as artificial neural networks (ANN) [11,18,22] and stepwise fit regression (SRG) [23][24][25] have increasingly gained attention as predictive tools, due to their unique advantages of being non-parametric models that can handle large amounts of data sets and are capable of doing nonlinear regression. Both methodologies produce simple models constructed with no need of detailed knowledge of the underlying system, and these special features have made them applicable in many fields of science.…”

Ultrasound-Assisted Extraction of Taxifolin, Diosmin, and Quercetin from Abies nephrolepis (Trautv.) Maxim: Kinetic and Thermodynamic Characteristics

“…The target analyte yields differed in a variety of tissues, which may be explained by the variation in tissue density between leaves and bark. The predicted equilibrium yield and average extraction rate constant of the objective analytes varied under various temperatures because the thermal energy increased the diffusion and dissolution of the target compounds and other constituent molecules; in addition, higher temperatures affect the pressure, viscosity, and surface tension of the liquid system, and these properties may benefit acoustic wave propagation [44].…”