Energy recovery potential analysis of spent coffee grounds pyrolysis products

Li, Xiaofeng; Strezov, Vladimir; Kan, Tao

doi:10.1016/j.jaap.2014.08.012

Cited by 114 publications

(61 citation statements)

References 57 publications

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“…These results are superior to those reported in the literature [8], [9]. Therefore, it is estimated that the results obtained with high yield in the gas phase can be attributed to the high reaction times in the different treatments (between 1 and 4 h), which favours the mechanisms of densification of the biomass and the generation of not condensable fractions with the consequent reduction of the fraction of condensable compounds.…”

Section: Study Of the Performance Of Products For The Different Thermcontrasting

confidence: 79%

“…The observed trend for coffee husk is equivalent to the one that has been most reported in the literature, ie the yield in biofuels decreases between pyrolysis, HTC, and HTL, respectively [10]. The results obtained were higher than those obtained by Li et al [8] and Tsai et al [11]. Which reported yields between 27-39% w/w.…”

Section: Study Of the Performance Of Products For The Different Thermsupporting

confidence: 71%

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Valorization of Waste From Agro-Industry Using Thermo-Chemical Treatments

Strubinger

Oyoque

González

et al. 2017

WIT Transactions on Ecology and the Environment

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The increasing generation of solid waste and the interest in renewable and alternative energies has become goals in recent years. The objective of this work was to apply thermochemical conversion processes such as pyrolysis, and hydrothermal conversion (HTC and HTL) into waste from the industry such as the coffee husk (CH), and orange peel (OP) in order to determine their performance towards the production of biocarbon, distribution of organic liquid products, as well as characterization of the bio carbon, obtained. Pyrolysis treatments were carried out with a rapid heating ramp up to 500°C, HTC at 250C, and HTL at 280C for 4 hours in triplicates for each biomass. The highest bio carbon yield for OP was obtained by HTC with 36% w/w and for CH the pyrolysis with 40% w/w. The biocarbon obtained from the OP by pyrolysis has a high potential as fuel with a higher heating value (HHV) of 26,3 MJ/kg. On the other hand, in the CH processed by HTC and HTL reported HHV values of 23 MJ/kg. The processing by HTC and HTL favours the formation of biocarbon with high iodine and methylene blue (MB) indices compared to a commercial carbon, for the OP the values obtained are: 343 and 416 mg I2/g, and 174 and 188 mg MB/g whereas for CH 432 and 427 mg I2/g, and 264 and 173 mg AM/g. In relation to liquid organic products, the processing of OP induces the formation of organic compound fractions in the gasoline and diesel range (GRO+DRO) with values between 75-78% when the heat treatments are employed. For the CH, the highest fraction of GRO+DRO was obtained from the pyrolysis with 81%. The HTC obtained the lowest sulphur content for both processed biomass, where the values did not exceed 0.066% w/w.

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Section: Study Of the Performance Of Products For The Different Thermcontrasting

confidence: 79%

Section: Study Of the Performance Of Products For The Different Thermsupporting

confidence: 71%

Valorization of Waste From Agro-Industry Using Thermo-Chemical Treatments

Strubinger

Oyoque

González

et al. 2017

WIT Transactions on Ecology and the Environment

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“…The two peaks with maximum values of 307 and 399 °C, respectively, can be attributed to the degradation of the hemicellulose and lignin in the SCG (Plaza et al 2012;Li et al 2014). In addition, another degradation peak was observed for SCG at a relatively low temperature of 213 °C, which has not been reported by other researchers (Plaza et al 2012;Li et al 2014).…”

Section: Thermal Degradationmentioning

confidence: 53%

“…In addition, another degradation peak was observed for SCG at a relatively low temperature of 213 °C, which has not been reported by other researchers (Plaza et al 2012;Li et al 2014). However, Grace et al (2015) studied the thermal degradation of coffee oil, extracted from SCG, with a thermogravimetric analyzer at a heating rate of 10 °C/min in nitrogen environment and found that the degradation of the oil occurs in two steps.…”

Section: Thermal Degradationmentioning

confidence: 71%

Characterization of Wastes and Coproducts from the Coffee Industry for Composite Material Production

et al. 2016

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This study characterizes and compares coffee chaff (CC) and spent coffee grounds (SCG), the two most useful coffee waste products, and evaluates their performance as fillers and/or reinforcing agents in polymer composites. The morphologies of the CC and the SCG were studied using a scanning electron microscope (SEM). Detailed compositional and elemental analyses of the samples were carried out using several techniques. The thermal stabilities of the two types of biomass were evaluated using thermogravimetric analysis (TGA). Infrared spectroscopy was performed to investigate the functional groups available on the surface of the biomass. It was found that the CC had higher thermal stability, lower fat content, and a denser fibrous structure than the SCG, making it potentially a more suitable material than the SCG for use as a reinforcing filler in polymer composites. To verify this potential, CC and SCG filled polypropylene composites were produced and evaluated.

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“…Due to its high nitrogen content SCG can be directly used as fertilizer or as soil improver (or compost) (Kondamudi et al, 2008). Due to its high organic matter content, another possible valorisation route is the production of sugars to be fermented for bioethanol (Caetano, 2011) or for pyrolysis (Li et al, 2014). SCG can be used as fuel in industrial boilersdue to its high calorific value (Silva et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

On the Spent Coffee Grounds Biogas Production

Vítěz¹,

Koutný²,

Šotnar³

et al. 2016

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Due to the strict legislation currently in use for landfilling, anaerobic digestion has a strong potential as an alternative treatment for biodegradable waste. Coffee is one of the most consumed beverages in the world and spent coffee grounds (SCG) are generated in a considerable amount as a processing waste during making the coffee beverage. Chemical composition of SCG, presence of polysaccharides, proteins, and minerals makes from the SCG substrates with high biotechnological value, which might be used as valuable input material in fermentation process. The methane production ranged from 0.271-0.325 m 3 /kg dry organic matter.

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Energy recovery potential analysis of spent coffee grounds pyrolysis products

Cited by 114 publications

References 57 publications

Valorization of Waste From Agro-Industry Using Thermo-Chemical Treatments

Valorization of Waste From Agro-Industry Using Thermo-Chemical Treatments

Characterization of Wastes and Coproducts from the Coffee Industry for Composite Material Production

On the Spent Coffee Grounds Biogas Production

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