Spent coffee ground as source for hydrocarbon fuels

Döhlert, Peter; Weidauer, Maik; Enthaler, Stephan

doi:10.1016/j.jechem.2015.11.012

Cited by 32 publications

(9 citation statements)

References 49 publications

(23 reference statements)

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“…The moisture content of WCG was determined by measuring the mass before and after the drying of the collected samples. Drying was conducted in an electric oven (Tech-lab, stainless steel forced-air convection oven FAC-138SS) at 100 • C for 36 h. Mass of WCG was weighed before drying and at Energies 2020, 13,1770 3 of 15 intervals of 12 h. It was found that the mass stopped changing after 36 h which indicates the sample had dried. The following equation was used to determine the moisture content.…”

Section: Moisturementioning

confidence: 99%

“…% yield of coffee oil was achieved when the extraction process was carried out under optimal conditions. The infrared absorption spectrum analysis of WCG oil determined suitable functional groups for biodiesel conversion which was further treated using an ultrasonic-assisted transesterification process to successfully convert to biodiesel.Coffee is the world's second-largest traded liquid commodity, after oil, with approximately 8 million tons of coffee produced each year [13]. A large amount of heat energy is used to convert green coffee beans into brown roasted beans in the brewing process, generating large amounts of volatile organic compounds (VOCs) [14].…”

mentioning

confidence: 99%

“…Coffee is the world's second-largest traded liquid commodity, after oil, with approximately 8 million tons of coffee produced each year [13]. A large amount of heat energy is used to convert green coffee beans into brown roasted beans in the brewing process, generating large amounts of volatile organic compounds (VOCs) [14].…”

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confidence: 99%

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Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

et al. 2020

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Biodiesel is a proven alternative fuel that can serve as a substitute for petroleum diesel due to its renewability, non-toxicity, sulphur-free nature and superior lubricity. Waste-based non-edible oils are studied as potential biodiesel feedstocks owing to the focus on the valorisation of waste products. Instead of being treated as municipal waste, waste coffee grounds (WCG) can be utilised for oil extraction, thereby recovering an energy source in the form of biodiesel. This study evaluates oil extraction from WCG using ultrasonic and Soxhlet techniques, followed by biodiesel conversion using an ultrasonic-assisted transesterification process. It was found that n-hexane was the most effective solvent for the oil extraction process and ultrasonic-assisted technology offers a 13.5% higher yield compared to the conventional Soxhlet extraction process. Solid-to-solvent ratio and extraction time of the oil extraction process from the dried waste coffee grounds (DWCG) after the brewing process was optimised using the response surface methodology (RSM). The results showed that predicted yield of 17.75 wt. % of coffee oil can be obtained using 1:30 w/v of the mass ratio of DWCG-ton-hexane and 34 min of extraction time when 32% amplitude was used. The model was verified by the experiment where 17.23 wt. % yield of coffee oil was achieved when the extraction process was carried out under optimal conditions. The infrared absorption spectrum analysis of WCG oil determined suitable functional groups for biodiesel conversion which was further treated using an ultrasonic-assisted transesterification process to successfully convert to biodiesel.Coffee is the world's second-largest traded liquid commodity, after oil, with approximately 8 million tons of coffee produced each year [13]. A large amount of heat energy is used to convert green coffee beans into brown roasted beans in the brewing process, generating large amounts of volatile organic compounds (VOCs) [14]. The enormous demand for this beverage also produces a large quantity of residual waste after brewing. Every 1 ton of coffee beans produces 650 kg of coffee residue after brewing, known as WCG [15]. The global coffee industry produced an estimate of 9.34 million tons of waste in 2017, which was either incinerated, dumped in landfills or composted [16]. Every year Australia produces an estimated 75,000 tonnes of used ground coffee waste, and 93% of cafes send their WCGs to landfill. The annual domestic coffee consumption in Australia has reached almost 1.9 million 60 kg bags. On average, Australians consumed around 1.92 kilograms of coffee per person in 2017 [17]. The grounds that are used to make coffee are used only once and then immediately discarded. With rising rates of consumption, waste residues from the coffee industry (by-products from harvesting, processing, roasting and brewing stages of coffee production and processing) represent a challenge to worldwide directives aiming to reduce landfill volume. The inherent toxicity of several constituents within coffee...

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Section: Moisturementioning

confidence: 99%

mentioning

confidence: 99%

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Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

et al. 2020

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“…Due to the large volumes of fossil fuels required to supply the global demand for fuel, the confirmed reserves of fossil resources are being exhausted [1]. Additionally, the consumption of fossil fuels is leading to an increase in carbon dioxide emitted into the atmosphere, with the global transportation industry playing a substantial part [2].…”

Section: Introductionmentioning

confidence: 99%

Renewable Fuel Production by in Situ Hydrotreatment of Spent Coffee Grounds

2017

Nov. 27-28, 2017 South Africa ASETWM-17, RCABES-17 &Amp; EBHSSS-17

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Abstract-Renewable diesel production from bio-oils is more expensive in comparison to petroleum diesel, with the production of bio-oils from pyrolysis and liquefaction being significant contributors. The aim of this project is to assess the liquid yield obtainable by the in-situ hydrotreatment of spent coffee grounds through hydrotreatment. The spent coffee grounds are covered with a solvent and hydrotreated in a low or zero oxygen environment within a batch reactor loaded with catalyst. At certain conditions a significant increase in liquid product yield is observed, indicating that not only does hydrotreatment take place, but liquefaction forming bio-oils. These bio-oils are also then hydrotreated increasing the liquid yield obtained from the reactor.

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“…Despite promising nutritional properties of coffee sludge, it is used in industrial fields as a fuel in boilers due to its high calorific power [9,10], as feed for pigs, ruminant animals, chickens and rabbits [11][12][13] and as the potential source for fuel pellets and biodiesel production [14,15].…”

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confidence: 99%

Coffee sludge as a new food ingredient

2021

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Spent coffee grounds (coffee sludge) is the most common recycled material obtained in the production of instant coffee. Thus, about 6 million tons of coffee sludge are generated annually. The purpose of this study was to evaluate the use of coffee sludge as an innovative functional food ingredient in flour confectionery products and to study the effect of coffee sludge and its chemical components on sensory properties, volatile components and rheological properties of the final product. Spent coffee grounds contain significant amounts of insoluble dietary fiber, proteins, lipids, ash and lower glycemic sugars. Mixing wheat flour with coffee sludge did not affect significantly the rheological properties of the dough and overall acceptability of the final product. Thus, the obtained biscuits can be recommended for patients with diseases associated with obesity and diabetes, as well as for people who prefer low-calorie foods.

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Spent coffee ground as source for hydrocarbon fuels

Cited by 32 publications

References 49 publications

Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

Resource Recovery from Waste Coffee Grounds Using Ultrasonic-Assisted Technology for Bioenergy Production

Renewable Fuel Production by in Situ Hydrotreatment of Spent Coffee Grounds

Coffee sludge as a new food ingredient

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