Comprehensive evaluation of the life cycle of liquid and solid fuels derived from recycled coffee waste

Kamil, Mohammed; Ramadan, K.; Olabi, Abdul Ghani; Shanableh, Abdallah; Ghenaï, Chaouki; Naqbi, Amna K. Al; Awad, Omar I.; Ma, Xiao

doi:10.1016/j.resconrec.2019.104446

Cited by 19 publications

(11 citation statements)

References 37 publications

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“…These results show that the price of SCG pellets is very low compared to the Italian wood pellet price of 0.27 €/kg in 2011 [20]. Generally, the price of SCG pellets is estimated to be about 40% of the price of wood pellets [21]. SCG is composed of a variety of organic compounds, including lignin, cellulose, lipids, polysaccharides, fats, and minerals, enabling SCG to be used in various fields [8].…”

Section: Introductionmentioning

confidence: 85%

Solid Fuel Characteristics of Pellets Comprising Spent Coffee Grounds and Wood Powder

Woo

Kim

2021

Energies

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To help mitigate the effects of global warming and fossil fuel depletion caused by human use of fossil fuels, solid fuel pellets were developed from a mixture of spent coffee grounds (SCG) and pine sawdust (PS). The feasibility of SCG-PS pellets as biofuel was also verified by evaluating its fuel quality. An increase in the proportion of SCG in the pellet led to an increase in its calorific value, owing to the high C, H, and oil contents, and increases in the ash and S contents, owing to the high S content in SCG. Analysis of the feedstock particle size distribution revealed that SCG particles are smaller than PS particles; thus, the durability of the pellet decreases as the proportion of SCG increases. Accordingly, the samples with higher SCG proportions (70 and 90 wt.%) did not meet the moisture content standards for biomass solid refuse fuel (bio-SRF) set by the Korea Ministry of Environment, whereas the samples with lower SCG proportions did. In particular, CP10 (10 wt.% SCG + 90 wt.% PS) satisfied the quality standards of Grade 1 wood pellets, demonstrating the feasibility of using SCG as a raw material for biofuel pellet production.

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Section: Introductionmentioning

confidence: 85%

Solid Fuel Characteristics of Pellets Comprising Spent Coffee Grounds and Wood Powder

Woo

Kim

2021

Energies

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“…( 11)) and the mass balance of the compounds of the retentate can be calculated by Eqs. ( 12)- (14).…”

Section: Process 1: Production Of Natural Extractmentioning

confidence: 99%

“…The use of the residue to produce these high added-value products does not only reduce its environmental impact but provides additional value, closing the life cycle, transforming the waste from one industry into the raw material for another, pursuing the goal of zero-waste emissions leading to a truly circular economy by closing the life cycle. Some authors have studied the use of SCG to produce different types of biofuels, such as biodiesel and bioethanol, , biogas, bio-oil, and pellets; food supplements and biocomponents for the pharmaceutical and cosmetic industries, such as caffeine, antioxidants, and phenolics; natural extracts; , additives for industry, such as tannins or polymers such as polyhydroxyalkanoates (PHAs); fertilizer production for some types of crops and energy production . However, these are experimental studies that only evaluate the production yields of various products but do not carry out techno-economic studies of the entire process.…”

Section: Introductionmentioning

confidence: 99%

Integrated Design of Biorefineries Based on Spent Coffee Grounds

Taifouris

Corazza

Martı́n

2021

Ind. Eng. Chem. Res.

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The circular economy concept applied to the management of Spent coffee Ground is an opportunity to obtain a portfolio of high added-value products and reducing the environmental impact while increasing the profitability and reducing the energy consumption of the soluble coffee production process. A systematic analysis of the alternatives is performed to unveil integration opportunities and find synergies aiming at the optimal set of processes and products. In this work, five products, dry natural extract, dry natural pigment for the textile industry, biogas, digestate, and electrical energy, throughout 3 different processes are considered. A systematic techno-economic analysis of all processes is carried out and two processes were found economically promising, the production of power and the production of natural extract and pigment. The production of natural pigment and natural extract is the most profitable process with a profit 10 times greater than the production of electrical energy. The operation and investment costs are 4.25 MM€/year and 14.1 MM€ respectively. The use of SCG to produce biodiesel is discarded after the analysis. Therefore, it is possible to achieve economic benefit from the treatment of this waste.

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“…With respect to SCGs, according to Kamil et al [4], one (1) ton of SCG generates 682 kg of CO 2eq , while the landfilling of SCGs produces 28.644 million tons of CO 2eq per year, a quantity comparable to the CO 2 generated by 10.6 million liters of burned diesel fuel [4]. Thus, the disposal of SCGs needs to be properly managed to reduce their environmental impact.…”

Section: Introductionmentioning

confidence: 99%

“…This is in accordance with the study of Okur et al [26], who reported that chlorogenic acid was found as the main phenolic compound in SCGs, irrespective of the method used for their extraction. In addition, concentration of CGAs in SCGs was found to be four (4) to seven (7) times higher than their corresponding content in coffee brews [19]. Furthermore, coffee grounds contain methylxanthines, with caffeine being the major compound recovered, constituting 1% to 2% of the dry SCG [2].…”

Section: Introductionmentioning

confidence: 99%

Spent Coffee Grounds’ Valorization towards the Recovery of Caffeine and Chlorogenic Acid: A Response Surface Methodology Approach

et al. 2021

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The amount of spent coffee grounds (SCGs) created, represents an environmental challenge worldwide. In this context, the aim of the present study was to exploit the potential of SCGs as a source of bioactive compounds that can be utilized in high value-added products. Thus, a cost-effective and environmentally friendly extraction technique was developed to ensure extracts with high total phenolic content and antioxidant activity, as well as significant amounts of caffeine and chlorogenic acid. Response surface methodology was implemented to evaluate the effects of the main extraction parameters (i.e., time, temperature, and ethanol-to-water ratio) and their interactions on the defined responses. The ethanol ratio was found to be the most significant variable. Then, a set of optimum values was determined (i.e., 7 min, 75 °C, and ethanol:water ratio 5:95), where the predicted values for responses were found to be 5.65% for the yield (Y1), 152.68 mg gallic acid equivalents per L for total phenolic content (Y2), 0.797 μmol Trolox equivalent per mL for the antioxidant activity (Y3), 30.5 ppm for caffeine concentration (Y4), and 17.4 ppm for chlorogenic acid concentration (Y5). Furthermore, the corresponding high experimental values from the validation experiment fitted well to these predictions, clearly clarifying the high potential of SCG extracts for use in high value-added applications.

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Comprehensive evaluation of the life cycle of liquid and solid fuels derived from recycled coffee waste

Cited by 19 publications

References 37 publications

Solid Fuel Characteristics of Pellets Comprising Spent Coffee Grounds and Wood Powder

Solid Fuel Characteristics of Pellets Comprising Spent Coffee Grounds and Wood Powder

Integrated Design of Biorefineries Based on Spent Coffee Grounds

Spent Coffee Grounds’ Valorization towards the Recovery of Caffeine and Chlorogenic Acid: A Response Surface Methodology Approach

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