A case study on microwave pyrolysis of waste tyres and cocoa pod husk; effect on quantity and quality of utilizable products

Vaštyl, Michal; Jankovská, Zuzana; Cruz, Gerardo J. F.; Matějová, Lenka

doi:10.1016/j.jece.2021.106917

Cited by 11 publications

(7 citation statements)

References 48 publications

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“…For example, Vaštyl et al. (2022) 45 obtained values of 40.0% and 17.1% by weight for elemental carbon and fixed carbon content, respectively, for CPH obtained from Peru. Ghysels et al.…”

Section: Resultsmentioning

confidence: 99%

Adsorption dynamics of Cd2+(aq) on microwave-synthetized pristine biochar from cocoa pod husk: Green, experimental, and DFT approaches

Correa-Abril,

Stahl,

Cabrera

et al. 2024

iScience

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“…For example, Vaštyl et al. (2022) 45 obtained values of 40.0% and 17.1% by weight for elemental carbon and fixed carbon content, respectively, for CPH obtained from Peru. Ghysels et al.…”

Section: Resultsmentioning

confidence: 99%

Adsorption dynamics of Cd2+(aq) on microwave-synthetized pristine biochar from cocoa pod husk: Green, experimental, and DFT approaches

Correa-Abril,

Stahl,

Cabrera

et al. 2024

iScience

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“…The cartilage was separated from the bones mechanically using a knife and air dried at 105 °C for 24 h. The microwave pyrolysis of chicken cartilage was performed in a laboratory-modified LG MS23NECBW microwave oven adjusted for heating with a fixed-bed quartz reactor. The scheme of the system used for the synthesis of biochar and activated carbon is presented in our previous work [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…A significant reduction in the time required to convert biomass into biochar while reducing energy consumption can be achieved by microwave-assisted pyrolysis, in which non-contact conversion of microwave energy into thermal energy occurs [ 19 ]. The microwave energy is adsorbed by biomass, and microwave pyrolysis can be initiated at a temperature of around 600 °C [ 20 ]. The intermediate products of microwave-assisted pyrolysis of plant biomass differ from those obtained in conventional processes, probably because of the simultaneous degradation of hemicelluloses and lignin under microwaves in contrast to their sequential decomposition during heating [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the application of microwave pyrolysis, rapid, volumetric, selective, and uniform heating of biomass can be obtained [ 22 ]. So far, microwave-assisted pyrolysis has been mainly used to synthesise biochar and char from plant-derived materials (e.g., pecan nutshells, woody biomass, sugarcane bagasse, oat hull), sludges, and tyres [ 19 , 20 , 21 ]. There are no reports in the literature on the use of microwaves to synthesise biochar from waste from the animal industry.…”

Section: Introductionmentioning

confidence: 99%

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Chicken Cartilage-Derived Carbon for Efficient Xylene Removal

Dobrzyńska

Jankovská

Matějová

2023

IJMS

Self Cite

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Chicken cartilage was used for the first time as a raw material for the microwave-assisted synthesis of biochar and activated carbon. Various microwave absorbers, i.e., commercial active carbon, scrap tyres, silicon carbide, and chicken bone-derived biochar, as well as various microwave powers, were tested for their effect on the rate of pyrolysis and the type of products formed. Biochars synthesised under 400 W in the presence of scrap tyres and chicken bone-derived biochar were activated with KOH and K2CO3 with detergent to produce activated carbon with a highly developed porous structure that would be able to effectively adsorb xylene vapours. All carbons were thoroughly characterised (infrared spectroscopy, X-ray fluorescence spectrometry, nitrogen adsorption/desorption, Raman spectroscopy, proximate and ultimate analysis) and tested as xylene sorbents in dynamic systems. It was found that the activation causes an increase of up to 1042 m2·g−1 in the specific surface area, which ensures the sorption capacity of xylene about 300 mg·g−1. Studies of the composition of biogas emitted during pyrolysis revealed that particularly valuable gaseous products are formed when pyrolysis is carried out in the presence of silicon carbide as a microwave absorber.

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“…There are limited studies on the design and performance of condensers in the microwave reduction process of different waste which has a significant role in the output liquid and gases from the reactor. The vapor after the microwave reactor is passed to the condenser which is separated into the liquid phase and gas phase after condensation (Vaštyl et al., 2022). For various waste materials, the condensation temperature is different (Cornell & Wieman, 2002).…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of a shell and multiple tubes condensing heat exchanger in a modified microwave plant applied for reprocessing End of Life Tires (ELTs)

Babaei‐Mahani

Sardari

Soltani

et al. 2023

Environmental Quality Mgmt

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The condensation heat exchanger has a critical role in the microwave reduction process to separate and capture valuable by‐products after the microwave reactor. This study aims to perform a computational fluid dynamics (CFD) simulation of a condenser to assess the heat transfer performance of the heat exchanger comprehensively. The type of heat exchanger used for this study is based upon an existing industrial‐scale condenser taken from a conventional thermal pyrolysis end of tires (ELT) reprocessing plant and repurposed for integration into a 1500 kg/h ELT microwave reduction process. The condenser is a shell‐and‐multiple‐tube heat exchanger in which the syngas passes through the tubes while cold water from a cooling tower is placed inside the shell. After the simulation, the effects of inlet temperatures and mass flow rates of the gas and water are investigated. The results show that the heat transfer rate is 58 kW for the inlet air velocity of 0.25 m/s and increases due to the convective heat transfer by 32% and 55% when the air velocity rises to 0.5 and 1 m/s, respectively, for the inlet gas and water temperatures of 80 and 15°C, respectively. Additionally, because the outlet air temperature and the inlet water temperature are strongly correlated with convective heat transfer, the outlet air temperature is equivalent to 17.2, 22.3, and 29.5°C when the inlet water temperature is 15, 20, and 25°C, respectively.

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A case study on microwave pyrolysis of waste tyres and cocoa pod husk; effect on quantity and quality of utilizable products

Cited by 11 publications

References 48 publications

Adsorption dynamics of Cd2+(aq) on microwave-synthetized pristine biochar from cocoa pod husk: Green, experimental, and DFT approaches

Adsorption dynamics of Cd2+(aq) on microwave-synthetized pristine biochar from cocoa pod husk: Green, experimental, and DFT approaches

Chicken Cartilage-Derived Carbon for Efficient Xylene Removal

CFD simulation of a shell and multiple tubes condensing heat exchanger in a modified microwave plant applied for reprocessing End of Life Tires (ELTs)

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