Processing spent coffee ground powders for renewable energy generation: Mechanical dewatering and thermal drying

Rocha, Thalyne de Almeida Ferreira; Ferreira, María do Carmo; Freire, José Teixeira

doi:10.1016/j.psep.2020.09.003

Cited by 5 publications

(5 citation statements)

References 52 publications

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“…In [23], an analytical and simulation methodology is introduced to assess the thermal and hygroscopic properties of paddy at the outlet. The mathematical model presented in this study is designed to predict the optimal design of a dryer column.…”

Section: Literature Reviewmentioning

confidence: 99%

Fluidized Bed Dryer with food processing Application Using Exploratory Data Analysis

Rasheed,

Noori,

Abas

et al. 2023

IIRJET

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The Fluidized bed, a multi-phase innovation, makes a difference in useful contact in the midst of them, consequently, it is broadly utilized within the drying of vegetables, drug store businesses, chemical exchange, metallurgy, oil and in generating warm control. In ﬂuidized bed forms, the strong and gas collaboration and responses in the midst of chemicals create sufficient factors which ought to be overseen, making the method exceptionally convoluted. Subsequently, to expect and assess diverse forms ﬂuidized bed modeling and simulation are utilized all around. The prime intent of this think isn't as it were to conclude, but too to analyze and hone diverse parameters like Speed, discuss Temperature and Volume stream rate to accomplish the ideal drying rate in a fluidized bed dryer. A warming weapon with unstable temperatures is utilized to warm the air from the discuss blower, which encompasses an arrangement to switch between seven diverse speeds of discuss. The volume stream rate of the blower is consistent, i.e. 3.3 m3/min. The temperature of the discuss information (at both the entrance and exit of the drying chamber) is compared by employing a bland K-type thermocouple with 2 tests on an advanced show. What comes about, particularly the greatest drying rate is at that point approved to get the ideal values of the discuss speed, temperature, weight drop along the drying chamber and amount of dryable. The optimization of the specified parameters will be done utilizing one of the different optimization procedures accessible.

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Section: Literature Reviewmentioning

confidence: 99%

Fluidized Bed Dryer with food processing Application Using Exploratory Data Analysis

Rasheed,

Noori,

Abas

et al. 2023

IIRJET

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“…Industrial SCG has a high moisture content (>80%) that makes it an unstable material susceptible to microbiological, yeast and mold contamination. Therefore, it is necessary to apply an industrial drying process in order to obtain a stable material (water content ≈10% wet basis), and then explore extraction or other processes for the valorization of dry SCG 21 . Dehydration is one of the most popular and energy‐intensive unit operations in food industry, which seeks to remove water from the food matrix, prevent microbial growth, enzymatic activity and consequently extend the shelf life 22 .…”

Section: Introductionmentioning

confidence: 99%

“…5 As a result, the optimum temperature, air velocity and cake thickness parameters were 60 °C, 2.0 m s −1 and 0.012 m, respectively, resulting in a raw material with good technical and functional characteristics. 21,23,24 However, conventional extraction methods such as Soxhlet, water distillation, steam distillation, column chromatography and precipitation have been reported and used by the scientific community for several years. 25 However, conventional methods are considered as non-eco-friendly alternatives, because such systems result in high toxic solid and organic waste, consume considerable amounts of water and energy, and are not cost-effective processes at an industrial scale.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is necessary to apply an industrial drying process in order to obtain a stable material (water content ≈10% wet basis), and then explore extraction or other processes for the valorization of dry SCG. 21 Dehydration is one of the most popular and energyintensive unit operations in food industry, which seeks to remove water from the food matrix, prevent microbial growth, enzymatic activity and consequently extend the shelf life. 22 Some of the most common drying techniques are oven drying, solar drying, thin layer hot air-drying, spray drying, infrared drying, freeze-drying, fluidized and vibro-fluidized bed drying and dielectric drying among others .…”

Section: Introductionmentioning

confidence: 99%

“…The thin layer hot air‐drying process was evaluated in previous research with SCG generated in a coffee shop 5 . As a result, the optimum temperature, air velocity and cake thickness parameters were 60 °C, 2.0 m s −1 and 0.012 m, respectively, resulting in a raw material with good technical and functional characteristics 21,23,24 …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel process line for the valorization of industrial spent coffee grounds through coffee roasting technology and ultrasonic‐assisted extraction

Osorio-Arias

Quintero²,

Velásquez³

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND:The main by-product of the coffee industry is spent coffee grounds (SCG). To the best of our knowledge, this is the first occasion where industrial SCG has been used to build a batch-valorization line combining barrel coffee roasters as an innovative drying process and ultrasound-assisted extraction technology under the biorefinery concept, seeking to extract chlorogenic acids (CGA).RESULTS: A Probat Sample Barrel Roaster were used to determine the optimal temperature, volume flow of fan, and time for a novel drying method. Drying optimization was carried out in order to reach 5.0% moisture content, reduce water activity and maximize total CGA content. Optimal conditions of 140 °C, 160.0 m 3 h −1 and 11.43 min for temperature, volume flow of fan, and time, respectively, were obtained with a desirability of 70%. Likewise, the optimal temperature, power and frequency settings for an ultrasonic extraction procedure of CGA from dried SCG were evaluated. To maximize the total CGA content, the ultrasonic technique was optimized. Temperature 50 °C, frequency 37 kHz and power 100 W with a desirability of 80% were necessary for optimality. The study was completed with a kinetic analysis using a second-order rate model, Peleg's kinetic model and the phenomenological model. CONCLUSION: Industrial coffee by-products can be processed and valorizing using barrel coffee roasters as a novel technique. For process design, the kinetic parameters of ultrasound-assisted extraction are a helpful tool. A new mathematical model is presented that takes into account the impact of changing temperature on the ultrasonic process.

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On the design of conical hoppers for spent coffee grounds: Moisture content and particle-size effects

Sousa

Schulz

Condotta

et al. 2021

Journal of Food Engineering

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Processing spent coffee ground powders for renewable energy generation: Mechanical dewatering and thermal drying

Cited by 5 publications

References 52 publications

Fluidized Bed Dryer with food processing Application Using Exploratory Data Analysis

Fluidized Bed Dryer with food processing Application Using Exploratory Data Analysis

A novel process line for the valorization of industrial spent coffee grounds through coffee roasting technology and ultrasonic‐assisted extraction

On the design of conical hoppers for spent coffee grounds: Moisture content and particle-size effects

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