A spent coffee grounds based biorefinery for the production of biofuels, biopolymers, antioxidants and biocomposites

Karmee, Sanjib Kumar

doi:10.1016/j.wasman.2017.10.042

Cited by 218 publications

(116 citation statements)

References 104 publications

Supporting

Mentioning

108

Contrasting

Unclassified

Order By: Relevance

“…Assim sendo, é imensurável a quantidade de pó de café pós-uso, borra de café, descartado por residências e comércios no planeta, gerando aumento no volume desses resíduos que são depositados no meio ambiente, ou queimados nas caldeiras para geração de vapor ou destinados para a agricultura para serem utilizados como adubo orgânico [19][20]. A borra de café apresenta em sua composição lipídios, proteínas e fibras [21], logo apresenta características estruturais de uma fibra natural, porém por ser um resíduo não apresenta aplicação na indústria [22][23].…”

Section: ____________________________________________________________unclassified

Influência de fatores ambientais nas propriedades mecânicas de biocompósitos de pla reforçado com fibra de coco e borra de café

Santos

Passador

Montagna³

2020

Tecno-log.

View full text Add to dashboard Cite

________________________________________________________________________________________________________ RESUMOO desenvolvimento de biocompósitos poliméricos tem despertado tanto o interesse científico quanto industrial em desenvolver produtos ecologicamente corretos para diversas aplicações. Desta forma, este trabalho de pesquisa teve o intuito de desenvolver e caracterizar compósitos biodegradáveis de poli (ácido lático) (PLA), reforçado com diferentes porcentagens (5% e 15% m/m) de fibra de coco (FC) e borra de café (BC), sem tratamento superficial. Tanto a FC quanto a BC são popularmente tratadas como resíduos sólidos e apresentam grande potencial para serem utilizados como cargas naturais agindo como reforço e também como aceleradores da biodegradação em matrizes poliméricas para a obtenção de um material biodegradável. Os compósitos foram processados em um homogeneizador DRAIS seguido de prensagem a quente. As amostras foram caracterizadas pela análise visual (imagens macroscópicas) e medidas de ângulo de contato (goniômetro), bem como foram submetidas aos testes de absorção de água e envelhecimento em estufa, seguido do ensaio de resistência ao impacto Izod. Após, verificou-se absorção de água, perda de massa, análise visual, resistência mecânica ao impacto Izod e a caracterização morfológica por microscopia eletrônica de varredura (MEV) da superfície de fratura das amostras após ensaio mecânico. A partir dos resultados obtidos verificou-se a boa adesão entre as cargas naturais e a matriz de PLA, resultando em valores de resistência ao impacto próximo ao do PLA puro, porém os fatores ambientais influenciaram diretamente nessas propriedades mecânicas, tendo a umidade interferida na redução e no envelhecimento do leve acréscimo dos valores de resistência ao impacto.

show abstract

Section: ____________________________________________________________unclassified

Influência de fatores ambientais nas propriedades mecânicas de biocompósitos de pla reforçado com fibra de coco e borra de café

Santos

Passador

Montagna³

2020

Tecno-log.

View full text Add to dashboard Cite

show abstract

“…Previous studies have reported several suitable treatment methods of SCG within its subsequent purpose utilization. SCG can be converted into biofuels of different forms (liquid, solid, gaseous) as biodiesel, bioether, biochar, bio-oil, or biogas by using of advanced biotechnological and chemical treatment processes [11,12]. Its utilization for production of other value-added products, such as H 2 or ethanol, was also reported with satisfactory results due to its high content of residual oil (approximately 15%) [13,14].…”

Section: Yearmentioning

confidence: 99%

Valorization of Bio-Briquette Fuel by Using Spent Coffee Ground as an External Additive

et al. 2019

View full text Add to dashboard Cite

The present study investigates the quality changes of wood bio-briquette fuel after the addition of spent coffee ground (SCG) into the initial feedstock materials (sawdust, shavings) in different mass ratios (1:1, 1:3). Analysis of SCGs fuel parameter proved great potential for energy generation by a process of direct combustion. Namely, level of calorific value (GCV = 21.58 MJ·kg −1 ), of ash content (Ac = 1.49%) and elementary composition (C = 55.49%, H = 7.07%, N = 2.38%, O = 33.41%) supports such statement. A comparison with results of initial feedstock materials exhibited better results of SCG in case of its calorific value and elementary composition. Bulk density ρ (kg·m −3 ) and mechanical durability DU (%) of bio-briquette samples from initial feedstock materials were following for sawdust: ρ = 1026.39 kg·m −3 , DU = 98.44% and shavings: ρ = 1036.53 kg·m −3 , DU = 96.70%. The level of such mechanical quality indicators changed after the addition of SCG. Specifically, SCG+sawdust mixtures achieved ρ = 1077.49 kg·m −3 and DU = 90.09%, while SCG + shavings mixtures achieved ρ = 899.44 kg·m −3 and DU = 46.50%. The addition of SCG increased wood bio-briquettes energy potential but decreased its mechanical quality. Consequently, the addition of SCG in wood bio-briquette has advantages, but its mass ratio plays an important key role.Energies 2020, 13, 54 2 of 15 economics, politics, and the trade of many developing countries. The coffee production industry, i.e., plant cultivation, cherries harvest, bean processing, product packaging, sale marketing, and final product transportation, offers job opportunities for millions of people [5].Brazil belongs to the top countries in coffee production, as well as Vietnam, Indonesia, and Colombia. Together those countries generate more than 50% of the world's coffee production. Specific statistical data provided by the Food and Agriculture Organization of the United Nations (FAO) and by the International Coffee Organization (ICO) related to the coffee industry in the last years are expressed in Table 1.

show abstract

“…[2] Attempts have been made to utilize SCG for fertilizers, animal feeds, fuels, antioxidants, biopolymers, and biocomposites. [2][3][4] The residual bioactive materials and antioxidants in SCG are also of great interest as valued-added products, although their contents are reduced from the original coffee ground during brewing. [2,[4][5][6][7][8] The first study on extracting antioxidants from SCG was reported in 1998.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] The residual bioactive materials and antioxidants in SCG are also of great interest as valued-added products, although their contents are reduced from the original coffee ground during brewing. [2,[4][5][6][7][8] The first study on extracting antioxidants from SCG was reported in 1998. [9] The report showed that hexane or dichloromethane extracts from a gelatinous retentate of SCG increased the oxidative stability index (OSI) at 110 C. The extract also slightly increased the OSI of peanut oil heated at 180 C. Yen et al [3] reported antioxidant activity of SCG extracts in a liposome model system, which was determined by the thiobarbituric acid reactive substances (TBARS) assay and 2,2diphenyl-1-picrylhydrazyl (DPPH) radical scavenging ability.…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Activity of Spent Coffee Ground Extracts Toward Soybean Oil and Fish Oil

Hwang

Winkler‐Moser

Kim

et al. 2019

Euro J Lipid Sci & Tech

View full text Add to dashboard Cite

Although studies have shown that spent coffee ground (SCG) extracts have antioxidant activity, no systematic study has been reported under actual storage conditions. The purpose of this study is to estimate the feasibility of practical application of SCG extracts as natural antioxidants for soybean oil and fish oil. An ethanol extract (EE), an acetone extract (AE), and polar compounds isolated from oil (PCO) are prepared and their activity is compared to a synthetic antioxidant, butylated hydroxytoluene (BHT). EE shows the strongest radical scavenging activity for 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) radicals and the highest total phenolic content (TPC) followed by AE and then PCO. However, during storage of soybean oil and fish oil at 35 and 50 °C, AE has the strongest antioxidant activity as determined by peroxide value, conjugated diene value, p‐anisidine value, and headspace volatile analyses. In soybean oil, 0.25% AE has antioxidant activity that is equal to or better than 0.02% BHT. In fish oil, the antioxidant activity of 0.25% AE is inferior to that of 0.02% BHT. However, increased concentrations of AE show improved antioxidant activity. This study shows that SCG extracts can be practically used as natural antioxidants for vegetable oils and omega‐3 oils. Practical Application: Due to lack of information about the antioxidant activity of spent coffee ground (SCG) extracts, this study is specifically aimed and designed to provide information on their activity toward soybean oil and fish oil during actual storage. This study shows that 0.25% acetone extract has equal or better protective effects than BHT in soybean oil at 35 and 50 °C. The activity is further improved with increasing concentration. The activity of the acetone extract in fish oil is not as strong as in soybean oil, but higher concentrations further improve the antioxidant activity. In this study, it is clearly demonstrated that the SCG extracts can have practical use as natural antioxidants for vegetable oils and oils with high concentration of omega‐3 fatty acids. Among spent coffee ground (SCG) extracts, the acetone extract (AE) has the strongest antioxidant activity. In soybean oil, 0.25% AE has antioxidant activity that is equal to or better than 0.02% butylated hydroxytoluene (BHT). This study shows that SCG extracts can be practically used as natural antioxidants for edible oils.

show abstract

A spent coffee grounds based biorefinery for the production of biofuels, biopolymers, antioxidants and biocomposites

Cited by 218 publications

References 104 publications

Influência de fatores ambientais nas propriedades mecânicas de biocompósitos de pla reforçado com fibra de coco e borra de café

Influência de fatores ambientais nas propriedades mecânicas de biocompósitos de pla reforçado com fibra de coco e borra de café

Valorization of Bio-Briquette Fuel by Using Spent Coffee Ground as an External Additive

Antioxidant Activity of Spent Coffee Ground Extracts Toward Soybean Oil and Fish Oil

Contact Info

Product

Resources

About