Properties of biochar obtained by hydrothermal carbonization and torrefaction of peat

Krysanova, K. O.; Krylova, A. Yu.; Зайченко, В. М.

doi:10.1016/j.fuel.2019.115929

Cited by 63 publications

(31 citation statements)

References 43 publications

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“… 32 However, some researchers also reported that the change of the S content has nothing to do with temperature. 33 , 34 The reason may be that the content of S in the samples and the washing times of solid products affect the experimental results. The same result was found in the N content.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Temperature on the Properties of Hydrochars Obtained by Hydrothermal Carbonization of Waste Camellia oleifera Shells

et al. 2021

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Hydrothermal carbonization (HTC) is a thermochemical conversion technique that can produce renewable solid biofuel by all types of waste. Waste Camellia oleifera shells (WCOSs) can be used to produce hydrochars via HTC. The effect of HTC temperature on the physicochemical properties and combustion behaviors of hydrochars was analyzed by varying from 150 to 300 °C. The mass yield of hydrochars decreased from 72.45% at 150 °C to 41.88% at 300 °C with the increase in temperature, and the higher heating value increased from 19.22 MJ/kg at 150 °C to 29.97 MJ/kg at 300 °C. The H/C and O/C values reduced from 1.30 and 0.66 of HTC150 to 0.77 and 0.27 of HTC300, respectively. Fourier transform infrared spectroscopy analysis indicated that the functional groups of hydrochar have changed because of the dehydration and decarboxylation reaction. The surface structure of hydrochars was rougher, and many pore structures were found at 240–300 °C by scanning electron microscopy analysis. The combustion behaviors of WCOSs and their hydochars are distinct via thermogravimetric analysis, and the stability of hydrochars was strengthened with the increase in HTC temperature.

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Section: Resultsmentioning

confidence: 99%

The Effect of Temperature on the Properties of Hydrochars Obtained by Hydrothermal Carbonization of Waste Camellia oleifera Shells

et al. 2021

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“…On the other hand, the increase in the carbonization temperature engenders an increase in the degradation rate of the cellulose and hemicellulose into higher concentrations of intermediate by-products such as soluble aldehydes, aldols and fatty acids as well as volatile matters including alkanes (Atallah et al, 2019). These by-products, eventually incorporated in the generated solids, are usually characterized with higher calorific properties than cellulose and hemicellulose, which enhances the overall HHV of the hydrochars (Krysanova et al, 2019).…”

Section: Energy Contentmentioning

confidence: 99%

Olive mill wastewater: From a pollutant to green fuels, agricultural and water source and bio-fertilizer – Hydrothermal carbonization

Azzaz

Jeguirim

Kinigopoulou³

et al. 2020

Science of The Total Environment

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Hydrothermal carbonization (HTC) is considered as a promising technique for wastes conversion into carbon rich materials for various energetic, environmental and agricultural applications. In this work, the HTC of olive mill wastewater (OMWW) was investigated at different temperatures (180 -220°C) and both, the solid (i.e., hydrochars) and the final process liquid derived from the thermal conversion process were deeply analyzed. Results showed that the solid yield was affected by the temperature, i.e., decrease from 57% to 25% for temperatures of 180°C and 220°C, respectively. Furthermore, the hydrochars presented an increasing fixed carbon percentage with the increase of the carbonization temperature, suggesting that decarboxylation is the main reaction driving the HTC process. The decrease in the O/C ratio promoted an increase of the high heating value (HHV) by 32% for hydrochar prepared at 220°C. The process liquids were sampled and their organic contents were analyzed using GC-MS technique. Acids, alcohols, phenols and sugar derivatives were detected and their concentrations varied with carbonization temperatures. The assessment of the physico-chemical properties of the generated HTC by-products suggested the possible application of the hydrochars for energetic insights while the liquid fraction could be practical for in agricultural field.

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“…Some studies show that peat can be upgraded thermally by various methods, i.e., torrefaction [18], pyrolysis [19], gasification [20], or hydrothermal carbonization [21]. Each process favors different input substrates, process conditions, and end products.…”

Section: Peat Thermal-upgrading Methodsmentioning

confidence: 99%

“…Some studies show the prospect of thermal peat upgrading to fuels (gases or solids) using the overmentioned processes [18][19][20][21]28]. Nevertheless, none of them focus on medical/cosmetic peat waste particularly.…”

Section: Peat Thermal-upgrading Methodsmentioning

confidence: 99%

Medical Peat Waste Upcycling to Carbonized Solid Fuel in the Torrefaction Process

2021

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Peat is the main type of peloid used in Polish cosmetic/healing spa facilities. Depending on treatment and origin, peat waste can be contaminated microbiologically, and as a result, it must be incinerated in medical waste incineration plants without energy recovery (local law). Such a situation leads to peat waste management costs increase. Therefore, in this work, we checked the possibility of peat waste upcycling to carbonized solid fuel (CSF) using torrefaction. Torrefaction is a thermal treatment process that removes microbiological contamination and improves the fuel properties of peat waste. In this work, the torrefaction conditions (temperature and time) on CSF quality were tested. Parallelly, peat decomposition kinetics using TGA and torrefaction kinetics with lifetime prediction using macro-TGA were determined. Furthermore, torrefaction theoretical mass and energy balance were determined. The results were compared with reference material (wood), and as a result, obtained data can be used to adjust currently used wood torrefaction technologies for peat torrefaction. The results show that torrefaction improves the high heating value of peat waste from 19.0 to 21.3 MJ × kg−1, peat main decomposition takes place at 200–550 °C following second reaction order (n = 2), with an activation energy of 33.34 kJ × mol−1, and pre-exponential factor of 4.40 × 10−1 s−1. Moreover, differential scanning calorimetry analysis revealed that peat torrefaction required slightly more energy than wood torrefaction, and macro-TGA showed that peat torrefaction has lower torrefaction constant reaction rates (k) than wood 1.05 × 10−5–3.15 × 10−5 vs. 1.43 × 10−5–7.25 × 10−5 s−1.

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Properties of biochar obtained by hydrothermal carbonization and torrefaction of peat

Cited by 63 publications

References 43 publications

The Effect of Temperature on the Properties of Hydrochars Obtained by Hydrothermal Carbonization of Waste Camellia oleifera Shells

The Effect of Temperature on the Properties of Hydrochars Obtained by Hydrothermal Carbonization of Waste Camellia oleifera Shells

Olive mill wastewater: From a pollutant to green fuels, agricultural and water source and bio-fertilizer – Hydrothermal carbonization

Medical Peat Waste Upcycling to Carbonized Solid Fuel in the Torrefaction Process

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