Article
Agricultural Engineering
Abd El-Fatah Abomohra, Xuying Zheng, Qingyuan Wang, Jin Huang, Reham Ebaid
Summary: This study evaluated in-situ co-transesterification of wet spent coffee ground (SCG)/microalgae mixture for enhanced biodiesel production. The optimum conditions for maximum biodiesel yield were found to be 198 degrees C, 6 mL solvent g(-1) biomass, and a reaction time of 132 min. Pure microalgae showed the highest biodiesel yield, while pure SCG showed the lowest yield.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Ana Cervera-Mata, Leslie Lara, Alejandro Fernandez-Arteaga, Jose Angel Rufian-Henares, Gabriel Delgado
Summary: Spent coffee grounds (SCG) hydrochar, obtained by hydrothermal carbonization, can be used as an organic amendment in agricultural soil. Washed hydrochars show similar effects to SCG on soil and plant growth, but are more effective in element mobilization due to higher polyphenol content.
Article
Environmental Sciences
Ana Cervera-Mata, Gabriel Delgado, Alejandro Fernandez-Arteaga, Flavio Fornasier, Claudio Mondini
Summary: SCG by-products varied in properties, impacting C and N cycles and microbial biomass content differently. SCG and hydrochars showed higher volatile matter and water soluble C and N, while biochars exhibited the opposite behavior. The different characteristics of the by-products suggest they can effectively function in soil for various agronomic and environmental purposes.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agriculture, Dairy & Animal Science
David San Martin, Jone Ibarruri, Nagore Luengo, Jorge Ferrer, Aser Garcia-Rodriguez, Idoia Goiri, Raquel Atxaerandio, Mounir Medjadbi, Jaime Zufia, Estibaliz Saez de Camara, Bruno Inarra
Summary: This study assessed the effects of thermal or mechanical pre-treatments and enzymatic hydrolysis on spent coffee grounds' nutritional value and digestibility. The results showed that autoclaving did not improve the enzymatic performance or nutritional value. Hydrolysis reduced the digestibility of the solid phase and impaired its ruminal fermentation efficiency. Grinding emerged as the most promising valorisation strategy to improve SCG nutritional characteristics and their use for animal feed, contributing to the circular economy.
Review
Environmental Sciences
Getachew Dagnew Gebreeyessus
Summary: Coffee is a popular beverage worldwide, but the management and utilization of its byproduct, spent coffee grounds (SCG), is significant. There have been numerous studies on producing bio-products from SCG, although more experimentation and implementation are needed, as well as addressing the link between climate change and SCG management.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Materials Science, Multidisciplinary
Jonathan Tellers, Philippe Willems, Boke Tjeerdsma, Nicolas Sbirrazzuoli, Nathanael Guigo
Summary: Coffee grounds can be a valuable resource when used as fillers in polymer matrices, increasing the stiffness of the material. Extracted coffee grounds show a moderate catalytic effect on the curing reaction and perform best during curing at room temperature.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Engineering, Chemical
Manuel Taifouris, Marcos L. Corazza, Mariano Martin
Summary: By applying the circular economy concept to the management of spent coffee grounds, it is possible to obtain high added-value products, reduce environmental impact, increase profitability, and lower energy consumption. Through systematic analysis and techno-economic evaluation, production of natural extract and pigment was found to be the most profitable process.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Thermodynamics
Kuan-Ting Lee, Ching-Lin Cheng, Da-Sheng Lee, Wei-Hsin Chen, Dai-Viet N. Vo, Lu Ding, Su Shiung Lam
Summary: The new approach of using torrefied spent coffee grounds (TSCG) as a bioadsorbent for marine oil spill recovery shows promising results in terms of increased diesel adsorption capacity and higher heating value. The 300-degree C torrefied TSCG exhibits superior characteristics and has potential applications in environmental protection and resource recycling.
Article
Food Science & Technology
Francesca Masino, Giuseppe Montevecchi, Rosalba Calvini, Giorgia Foca, Andrea Antonelli
Summary: Spent coffee grounds are a source of bioactive compounds that can be extracted to create coffee-flavored liquor. By utilizing sensory techniques and mixture design, researchers were able to produce coffee-flavored liquors with a close sensory profile to the ideal one. The liquors showed intense black color, rich flavor, and high balance in terms of alcohol strength, bitterness, and sweetness.
FOOD QUALITY AND PREFERENCE
(2022)
Article
Horticulture
Giuseppe Picca, Asier Goni-Urtiaga, Cristina Gomez-Ruano, Cesar Plaza, Marco Panettieri
Summary: This study investigated the agronomical performances of two spent coffee ground-based composts with and without biochar as peat replacement for tomato development. The results showed that mixing coffee ground compost with peat promoted an increase in fruit production. However, the effectiveness of this alternative solution depends on the dilution level and plant development stage.
Article
Geosciences, Multidisciplinary
A. Cervera-Mata, V Aranda, A. Ontiveros-Ortega, F. Comino, J. M. Martin-Garcia, M. Vela-Cano, G. Delgado
Summary: This study evaluated the effects of spent coffee grounds (SCG) on the hydrophobicity of Mediterranean agricultural soils. It found that SCG increased soil hydrophobicity and was related to soil quality variables. The increase in hydrophobicity was associated with an improvement in soil physical properties.
Article
Food Science & Technology
Leslie Lara-Ramos, Jesus Fernandez-Bayo, Gabriel Delgado, Alejandro Fernandez-Arteaga
Summary: This study investigates the effect of activated spent coffee grounds (SCG) and its hydrochars at different temperatures as bio-chelates to increase the iron content of lettuce. The results show that all bio-chelates can enhance the iron content of plants, with AH160-Fe performing the best. Additionally, the application of ASCG-Fe and AH180-Fe also increases the manganese and copper content of lettuce.
FRONTIERS IN SUSTAINABLE FOOD SYSTEMS
(2023)
Review
Multidisciplinary Sciences
Matthew Pagett, Kar Seng Teng, Geraint Sullivan, Wei Zhang
Summary: The coffee industry generates a significant amount of waste coffee grounds (WCG) annually, which can be a great environmental concern if not properly disposed of. However, WCG can be utilized as cheap carbon precursors to synthesize various forms of carbon materials. These carbon materials derived from WCG have shown excellent electrochemical properties and have found applications in various electrochemical devices.
Article
Food Science & Technology
Carolina Andrade, Rosa Perestrelo, Jose S. Camara
Summary: Coffee waste, especially spent coffee grounds, is a valuable source of compounds that can be used in various industrial applications. This study focused on analyzing the volatile organic metabolites (VOMs) present in five different spent coffee grounds to identify potential antioxidants, anti-inflammatory agents, and antiproliferative agents for the food industry. A total of 111 VOMs from different chemical families were identified, with 60 compounds found in all samples. Furanic compounds, nitrogen compounds, and esters were the major contributors to the volatile fingerprint. The findings suggest that spent coffee grounds can be utilized as raw materials for the development of new food ingredients or products, as well as in pharmaceutical and cosmetic applications, promoting their integral valorization within the circular bioeconomy concept.
Article
Food Science & Technology
Dani Dordevic, Simona Dordevic, Fouad Ali Abdullah Abdullah, Tamara Mader, Nino Medimorec, Bohuslava Tremlova, Ivan Kushkevych
Summary: This study aims to produce edible/biodegradable packaging with the addition of spent coffee grounds (SCG) oil and investigate how this fortification affects the chemical, textural, and solubility properties of the films. The results showed that the packaging samples produced with the addition of SCG oil had higher antioxidant capacity compared to control samples. The findings suggest that films manufactured with SCG oil have significant potential as effective and promising materials for active food packaging purposes.
Article
Engineering, Environmental
Yui Kawasaki, Sayaka Nagao-Sato, Misa Shimpo, Kahori Fujisaki, Emi Yoshii, Rie Akamatsu, Petra Warschburger
Summary: This study qualitatively describes sustainable dietary behaviors (SDBs) that Japanese and German adults can implement in their lives, and quantitatively compares the similarities and differences in understanding SDBs between the two samples. The study found that Japanese participants were more focused on food waste prevention, while German participants were more focused on solving environmental problems.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kechun Chen, Yuan Ding, Liming Yang, Zhihao Wang, Haoxuan Yu, Difan Fang, Yufa Feng, Liying Hu, Chenxi Xu, Penghui Shao, Xubiao Luo, Liang Chen
Summary: This study proposes a targeted repair scheme for the recovery of graphite anodes from spent LIBs by systematically characterizing and analyzing the structure and composition of spent graphite (SG). The results show that the repair scheme achieves effective SG repair and the repaired graphite anode displays excellent lithium storage performance.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Takao Ueda, Shigeki Koyanaka, Tatsuya Oki
Summary: Fires caused by accidental crushing of batteries are a serious issue in the e-waste recycling process. A new in-line sorting system that uses X-ray scanning and deep learning has been developed to accurately detect batteries. Through a validation study, the system achieved higher accuracy compared to other existing programs.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Hannes Geist, Frank Balle
Summary: Research on circular economy often lacks empirical data, especially in the theory of circular process design and design for remanufacturing. This study systematically collected and analyzed engineering data on seven remanufacturing processes in the European automotive remanufacturing industry for the first time, providing empirical support for circular engineering challenges, potentials, and solutions.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Xiaojing Li, Fan Lue, Nanlin Liao, Hua Zhang, Na Yang, Pinjing He
Summary: This study assesses and predicts the greenhouse gas emissions on the timeline as waste treatment technologies develop in Shanghai from 1991 to 2025 using the Life Cycle Assessment (LCA) methodology. The findings demonstrate that GHG emission has reached net-zero in 2019 owing to the application of alternative technologies and waste segregation.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Bingchun Liu, Haoyang Wang, Xiaoqin Liang, Yibo Wang, Zijie Feng
Summary: The expansion of the photovoltaic market has resulted in a significant increase in PV waste. Therefore, conducting scientific research to determine the importance of the circular economy for sustainable growth in the PV industry is essential. The study demonstrates that accurate prediction of PV installed capacity and quantifying the importance of recycling in balancing the supply and demand of raw materials can be achieved through a multi-factor installed capacity prediction model and recovery potential prediction.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Review
Engineering, Environmental
Chuanzhen Zhang, Baojing Gu, Xia Liang, Shu Kee Lam, Yi Zhou, Deli Chen
Summary: Reactive nitrogen is crucial for agriculture and human nutrition, but mismanagement can have detrimental effects on human health and ecosystem services, hindering the achievement of the 2030 Sustainable Development Goals. Progress towards nitrogen-related targets varies across countries, highlighting the need for integrated management to achieve overall synergies.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Alessandro Gatto, Marijke Kuiper, Corina van Middelaar, Hans van Meijl
Summary: This study examines the economic and environmental effects of transitioning towards more circular food systems in the European Union (EU27) by feeding animals with low-opportunity-cost feed and better utilizing local feed resources. The results show that providing subsidies for circularity and promoting the use of low-cost feed can increase animal production, but also have negative impacts on land use and emissions. On the other hand, promoting domestic feed sourcing through import tariffs can decrease animal production and greenhouse gas emissions in agriculture. However, complementary policies are needed to mitigate drawbacks and enhance benefits of a more circular agri-food system.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Jinbo Zhang, Liu Chen, Yulei Xie, Pingjian Yang, Zheng Li, Huaicheng Guo, Yang Zhang, Lirong Liu
Summary: This study examines the impact of carbon taxes on low-carbon development and climate change mitigation. By constructing a cross-system bi-layer model, the study finds that reasonable carbon taxes can promote the stability of the energy network, reduce carbon emissions and air pollutants, and optimize production efficiency and the structure of the energy system. This study contributes to a better understanding of the effects and implementation pathways of carbon taxes.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Konstantin Born, Mehmet Metehan Ciftci
Summary: Increasing recycling of metals is important for reducing reliance on mining, but it cannot fully meet future metal demand. Primary production of metals is expected to continue rising, highlighting the need for alternative circular economy strategies such as demand reduction and mitigating harmful impacts of primary metal production.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Yinqiu Ma, Lin Huang, Jiahui Li, Wei Cao, Yumei Cai
Summary: Afforestation and reforestation, such as China's Grain for Green Program, have shown to effectively mitigate greenhouse gas emissions and contribute to carbon sink capacity. This study highlights the significant carbon potential of the program and its potential application in other countries to reduce CO2 in the atmosphere.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Arlind Dervishaj, Kjartan Gudmundsson
Summary: This paper reviews digital tools for supporting the Circular Economy (CE) in the built environment and provides suggestions. The study identifies limitations in the functionalities of current tools, including a lack of representative data for LCA and underdeveloped circularity indicators. Further development is needed in terms of interoperability aspects, integration of more sources of data for LCA and circularity, and possibilities for a comprehensive evaluation of design choices.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Mohamadreza Y. Azarfam, Anuj Maheshwari, Frank D. Blum, Siddhesh Chaudhari, Clinton Switzer, Ranji Vaidyanathan, Jay C. Hanan, Sudheer Bandla
Summary: This study introduces a feasible method for manufacturing recycled composites using post-consumer carpets and recycled resin. The resulting composites have impressive strength and modulus, surpassing commercial thermoplastics and making them suitable for structural applications. This research presents a promising approach to address carpet landfilling and reduce reliance on additives.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Pujiang Shi, Tianle Huang, Hong Kit Lim, Chiew Kei Tan, Jong-Min Lee, Chor Yong Tay
Summary: This study developed a highly porous bioadaptive 3D sponge-like construct from plastic materials in discarded keyboards for advanced in vitro applications. The findings demonstrate the potential of using discarded keyboards as a waste-to-resource feedstock to achieve waste reduction and maximize value-capture.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kuo-Jui Wu, Hailing Qiu, Caiyan Huang, Anthony S. F. Chiu, Ming-Lang Tseng
Summary: Government resource allocation practices for achieving carbon neutrality should be guided by dynamic system theory to identify potential dynamics. Carbon intensity control dynamics have a significant influence on other dynamics.
RESOURCES CONSERVATION AND RECYCLING
(2024)