Spent coffee grounds: A review on current utilization

McNutt, Josiah; He, Quan

doi:10.1016/j.jiec.2018.11.054

Cited by 216 publications

(119 citation statements)

References 166 publications

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“…Recently, the production of cellulase enzymes by SSF using coffee husk as substrate has been demonstrated [20], thus showing the potential of this strategy. However, despite the wide range of biotechnological applications to valorize the spent coffee grounds residue [21][22][23], such as biogas and fertilizer production, its use as substrate for enzyme production still needs to be further investigated.…”

Section: Introductionmentioning

confidence: 99%

β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing

et al. 2020

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Soluble coffee offers the combined benefits of high added value and practicality for its consumers. The hydrolysis of coffee polysaccharides by the biochemical route, using enzymes, is an eco-friendly and sustainable way to improve the quality of this product, while contributing to the implementation of industrial processes that have lower energy requirements and can reduce environmental impacts. This work describes the production of hydrolytic enzymes by solid-state fermentation (SSF), cultivating filamentous fungi on waste from the coffee industry, followed by their application in the hydrolysis of waste coffee polysaccharides from soluble coffee processing. Different substrate compositions were studied, an ideal microorganism was selected, and the fermentation conditions were optimized. Cultivations for enzymes production were carried out in flasks and in a packed-bed bioreactor. Higher enzyme yield was achieved in the bioreactor, due to better aeration of the substrate. The best β-mannanase production results were found for a substrate composed of a mixture of coffee waste and wheat bran (1:1 w/w), using Aspergillus niger F12. The enzymatic extract proved to be very stable for 24 h, at 50 °C, and was able to hydrolyze a considerable amount of the carbohydrates in the coffee. The addition of a commercial cellulase cocktail to the crude extract increased the hydrolysis yield by 56%. The production of β-mannanase by SSF and its application in the hydrolysis of coffee polysaccharides showed promise for improving soluble coffee processing, offering an attractive way to assist in closing the loops in the coffee industry and creating a circular economy.

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Section: Introductionmentioning

confidence: 99%

β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing

et al. 2020

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“…From this moment to the 2000s, studies were rare and fluctuating, despite the introduction of terms like sustainability and sustainable development spreading from the 1970s and strongly affecting the direction of research of the following years, which may deal with a green valorization of coffee waste. It is then from 2015 that a significant increase of publications was observed, almost tripling in just four years, highlighting the relevance and the attention received by the topic, which is definitely expected to increase [15]. Figure 1 shows the trend in time of the number of publications.…”

Section: Literature Reviewmentioning

confidence: 95%

“…It is worth mentioning the seven literature reviews that were found, which were very helpful tools allowing one to identify scientific trends. For instance, by comparing the first literature review carried out in 2011 [2] and the last, published in the current year [15], both dealing with different utilization of SCGs, what emerges is that new methods for extracting oil from SCGs and producing biodiesel were developed, as well as the new biodiesel production bypassing the oil extraction or even the usage of SCGs for fighting cancer cells in the human body and other interesting and advanced issues not considered before, providing coffee waste as a raw material for other processes. The utility and diffusion that literature reviews provide are also demonstrated by the fact that results from the citation analysis on the sample of articles reveal that they are the most cited works, with an average of 10.7 citations per year, compared to an average of 3.8 citations for journal articles, 1.1 for conference papers, 1 for article in press, and 0.7 for book chapters.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In this case, some clarifications are appropriate: The limited presence of the keyword adsorption is in conflict with what has just been written regarding the usage of the activated carbon; a possible justification for this fact is that SCGs can be directly used as adsorbents or through the activation of the carbon within. In light of the results provided by McNutt et al [15], this second origin is more common, with the most appropriate keyword "activated carbon". Fatty acid also owes its scarcity to being almost synonymous to biodiesel.…”

Section: Literature Reviewmentioning

confidence: 99%

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The Role of ICT in Supporting Spent Coffee Grounds Collection and Valorization: A Quantitative Assessment

2019

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As never before, there is nowadays the will to consider alternative energy sources from renewable and waste materials so as to preserve planet and society. One of the possible elements suitable for this purpose is every day in our houses: Coffee. Or rather, spent coffee grounds. Indeed, many studies in recent years have addressed its potential exploitation, especially for biodiesel production; recent works also pointed out its possible thermal valorization for industrial processes. In light of this, this paper proposes a new sustainable use of spent coffee grounds, converted into combustible pellets; this source can then be used not only for industrial heaters, but also for public or private buildings. To this end, a feasibility study of a pellet production plant fed by waste collected by vending companies operating in the North of Italy is developed, including the logistic model supported by an Information and Communication Technology (ICT) system to help gather spent coffee grounds from the different companies and collect them into the pellet production facility.

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“…Por outro lado, de acordo com as informações da Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), o consumo interno de café no Brasil é cerca de 1,07 milhões de toneladas, além disso, a perspectiva do consumo de café em pó para os próximos anos é de um aumento de 3,3% [17][18]. 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].…”

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.

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________________________________________________________________________________________________________ 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.

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Spent coffee grounds: A review on current utilization

Cited by 216 publications

References 166 publications

β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing

β-Mannanase Production Using Coffee Industry Waste for Application in Soluble Coffee Processing

The Role of ICT in Supporting Spent Coffee Grounds Collection and Valorization: A Quantitative Assessment

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

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