Gasification of spent coffee grounds in a semi-fluidized bed reactor using steam and CO2 gasification medium

Kibret, Henok Atile; Kuo, Yu‐Lin; Ke, Ting-Yu; Tseng, Yao-Hsuan

doi:10.1016/j.jtice.2021.01.029

Cited by 21 publications

(3 citation statements)

References 25 publications

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“…It was provided that the spent coffee grounds are rich in fatty acids, amino acids, lignin, polysaccahrides, polyphenols, tannins, and flavonoids, thus making this feedstock a potential substate for biofuel production, adsorbents, and chemical production [18][19][20]. There are some examples of investigations on the treatment and application of spent coffee grounds: (i) valorisation of SCG in solid biomass fuel in the form of briquettes using xanthan gum under low temperature and low pressure conditions [21]; (ii) gasification of SCG which gave good results and demonstrated the high energy potential of this material [22]; (iii) polyhydroxyalkanoates (chemical industry) [23]. The brewery industry generates spent grains, which are 85% of the total waste generated by brewery.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Biomass Wastes into Carbon Materials

et al. 2022

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This study presents the results of the biomass pyrolysis process focusing on biochar production and its potential energetic (as solid fuel) and material (as adsorbent) applications. Three kinds of biomass waste were investigated: wheat straw, spent coffee grounds, and brewery grains. The pyrolysis process was carried out under nitrogen atmosphere at 400 and 500 °C (residence time of 20 min). A significant increase in the carbon content was observed in the biochars, e.g., from 45% to 73% (at 400 °C) and 77% (at 500 °C) for spent coffee grounds. In addition, the structure and morphology were investigated using scanning electron microscopy. Thermal properties were studied using a simultaneous thermal analysis under an oxidising atmosphere. The chemical activation was completed using KOH. The sorption properties of the obtained biochars were tested using chromium ion (Cr3+) adsorption from liquid solution. The specific surface area and average pore diameter of each sample were determined using the BET method. Finally, it was found that selected biochars can be applied as adsorbent or a fuel. In detail, brewery grains-activated carbon had the highest surface area, wheat straw-activated carbon adsorbed the highest amount of Cr3+, and wheat straw chars presented the best combustion properties.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis of Biomass Wastes into Carbon Materials

et al. 2022

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“…One of the most critical criteria determining syngas quality and gasification output is reactor temperature. The gasification process requires temperatures above 700 °C to decrease tar production and convert the char left over from the pyrolysis step into syngas [8]. Solar drying is one of the oldest drying methods that utilizes solar radiation and energy.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis on the Performance of Designed Fluidized Bed Dryer for Drying Coffee Beans

Kavin Klinsman Konsil,

Norazlianie Sazali,

Kumaran Kadirgama

et al. 2023

ARASET

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Drying coffee beans is an important role in the process of making coffee. Most coffee producers dry their coffee beans under the natural sun, but it was found to be time-consuming and depended on the weather conditions. Fluidized bed dryer is found to be the most recent method to dry the coffee beans. However, not many reported on the performance of fluidized bed dryer in coffee drying. In the present research, the quality of the drying process using fluidized bed dryer was investigated by varying the streamline pattern and temperature distribution in the drying chamber. The result was compared with a different temperature and velocity applied. The simulation in ANSYS was conducted with three different velocities of 10 m/s, 20 m/s and 30 m/s with air temperature of 60 °C, 90 °C and 120 °C. The temperature supply was from the inside of the pipe to the end of the drying chamber. The streamline and the temperature distribution were absorbed between the difference of temperature and the velocity difference. The computational analysis of the simulation showed that the increase in velocity resulted in a temperature rise from 46.72°C to 49.04°C within the drying chamber for constant inlet temperature of 60 °C, and on the other hand the velocity in the drying chamber remains constant at average of 3.22 m/s for inlet velocity of 10 m/s despite the increase in temperature.

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“…Spent coffee grounds are the most valuable by-product of the coffee production process, its produced in cafes, restaurants, and houses from soluble industries of coffee preparation. The importance of spent coffee grounds comes from its high production rate, where 650 kg of spent coffee ground is produced per one ton of green coffee beans [4]. Spent coffee grounds' value comes from its high content in a wide range of organic compounds such as polyphenols and caffeine, which have an important value commercially and can be used in a wide range of applications [5,6].…”

Section: -Introductionmentioning

confidence: 99%

Caffeine Extraction from Spent Coffee Grounds by Solid-liquid and Ultrasound-assisted Extraction: Kinetic and Thermodynamic Study

Raheem,

Al-yaqoobi,

Znad

et al. 2024

IJCPE

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Coffee is the most essential drink today, aside from water, the high consumption of coffee and the byproducts of its soluble industries such as spent coffee grounds can have a negative effect on the environment as a source of toxic organic compounds. Therefore, caffeine removal from the spent coffee ground can be applied as a method to limit the effect of its production on the environment. The aim of this study is to determine the kinetics and thermodynamics parameters and develop models for both processes based on the process parameters by using traditional solid-liquid extraction and Ultrasound-assisted extraction methods. The processes were performed at a temperature range of 25 to 55 °C for traditional and ultrasound baths, and experimental time ranged from 5- 60 min. The results demonstrated that under the above conditions, the extraction process applies to the pseudo-first-order reaction, where the rate constant K value increases with temperature. The transition state parameters were also discussed where these parameters indicated that the system of the process exhibited an activated complex formation state resulting in a thermodynamically unfavorable process, and the thermodynamic parameters at the equilibrium state were also evaluated in terms of the obtained yield percentage. The results also showed that the ultrasound-assisted bath process showed a spontaneous behavior at temperatures of 45 °C and 55 °C with D°G of -1192.9703 and - 2725.25 J/mole. On the other hand, for the traditional method, the extraction process was approaching a spontaneous behavior with the temperature increasing where at 25 °C the D°G value was 10379.944 J and at a temperature of 55 °C it reached 8004.26 J/mole.

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Gasification of spent coffee grounds in a semi-fluidized bed reactor using steam and CO2 gasification medium

Cited by 21 publications

References 25 publications

Pyrolysis of Biomass Wastes into Carbon Materials

Pyrolysis of Biomass Wastes into Carbon Materials

Analysis on the Performance of Designed Fluidized Bed Dryer for Drying Coffee Beans

Caffeine Extraction from Spent Coffee Grounds by Solid-liquid and Ultrasound-assisted Extraction: Kinetic and Thermodynamic Study

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