Added-value molecules recovery and biofuels production from spent coffee grounds

Battısta, Federico; Barampouti, Elli Maria; Mai, Sofia; Bolzonella, David; Malamis, Dimitris; Μουστάκας, Κωνσταντίνος; Loizidou, Maria

doi:10.1016/j.rser.2020.110007

Cited by 79 publications

(55 citation statements)

References 121 publications

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“…Furthermore, in terms of SMP (L CH 4 g −1 TVS ) as well as MPR (LCH 4 L −1 reactor d −1 ) the blend of PS with 30% (v/v) CECL provided considerable enhancements, equivalent to 1.6 and 3.6fold increase, respectively, in comparison with reference scenario. Attending to other studies on AcoD bioconversion technology with biomass substrates the present study achieved higher values of SMP comparing with the application of food waste residues as co-substrates (Zamanzadeh et al, 2016;Girotto et al, 2017;Xie et al, 2017;Slorach et al, 2019;Battista et al, 2020). In addition, Kim et al (2017b) performed a study with SCG and different waste feedstocks, achieving SMP below 450 ml g −1 VS , results 35% lower than the average values obtained in the present research.…”

Section: Operational Parameters and Removal Efficienciessupporting

confidence: 50%

“…The world coffee consumption between 2019 and July 2020 was approximately 10,140,000 tons (ICO-International Coffee Organization, 2020), being after tea the second more consumed beverage (Battista et al, 2020;Rivera et al, 2020). The use of Abbreviations: AcoD, anaerobic co-digestion; AD, anaerobic digestion; CECW, cereal and exhausted coffee wastes; CECL, cereal and exhausted coffee liquor; CSTR, continuous stirred tank reactor; C/N, carbon nitrogen ratio; EC, electrical conductivity; HRT, hydraulic retention time; GPR, gas production rate; MPR, methane production rate; OLR, organic loading rate; PS, pig slurry; SCOD, soluble chemical oxygen demand; SELR, specific energy loading rate; SGP, specific gas production; SMP, specific methane production; TAN, total ammoniacal nitrogen; TCOD, total carbon oxygen carbon; TOC, total organic carbon; TKN, total Kjeldahl nitrogen; TS, total solids; TVS, total volatile solids.…”

Section: Introductionmentioning

confidence: 99%

“…bioresidues from coffee chain is of utmost importance due to the large quantity produced. For each kilogram of coffee beans used are generated 1.88 kg spent coffee grounds (SCG), which are produce through instant coffee industry and consumption in catering outlets and homes (Battista et al, 2020;Rivera et al, 2020). Over 90% of SCG is currently discarded as a valueless waste, although some is used as a boiler fuel after drying or as a mushroom cultivation medium in some countries.…”

Section: Introductionmentioning

confidence: 99%

“…Improper management of SCG can cause serious pollution because of the high oxygen consumption during decomposition of the easily degradable organic matter and the potential release of residual caffeine, tannin, and polyphenols. Given its high organic content (i.e., high calorific value), the potential of using SCG as a feedstock for biofuels is an interesting question in the context of waste-to-energy conversion (Kim et al, 2017a,b;Luz et al, 2017;Battista et al, 2020;Rivera et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Energetic Valorization of Cereal and Exhausted Coffee Wastes Through Anaerobic Co-digestion With Pig Slurry

Sousa

Duarte

Mesquita

et al. 2021

Front. Sustain. Food Syst.

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In the past years, there has been steady growth in work relating to improve resource efficiency through waste minimization and bioenergy recovery to mitigate climate change. Agro-food industries produce large amounts of bio-waste, challenging innovative energetic valorization strategies in the framework of circular economy principles. Anaerobic digestion (AD) technology is an interesting route to stabilize organic matter and produce biogas as a renewable energy source. This study involves continuous co-digestion of pig slurry (PS), cereal and exhausted coffee wastes (CECW) performed in a continuously stirred tank reactor, with a hydraulic retention time (HRT) of 16 days under at mesophilic conditions (36.9 ± 0.3°C). The experimental trials, were designed to include different cereal and exhausted coffee liquor (CECL) shares in the feeding mixture, corresponding to different PS to CECL ratios (PS:CECL), respectively: 100:0 (T0), 90:10 (T1), 80:20 (T2), and 70:30 (T3), in terms of percentage of inlet feeding rate (v:v). The results obtained for the feeding rate (70:30) yield to the highest specific methane production (SMP = 341 ml.gVS−1) led to a 3.5-fold improvement in comparison with the reference scenario. The synergetic effect between the microbial consortia of PS and the high carbon to nitrogen ratio (C/N) of CECL explain the improvements achieved. The maximum soluble chemical oxygen demand (SCOD) reduction (84.0%) due to the high content and soluble chemical oxygen demand to total chemical oxygen demand ratio (SCOD/TCOD) corroborate the results achieved. The digester stability, evaluated by specific energetic loading rate, was below the limit (0.4 d−1). Results from ANOVA showed a significant effect of CECL on the resulting GPR and SMP values. Additionally, Tukey's “Honest Significant Difference” method, confirmed statistically significant differences between the trials T3-T0, T3-T1, T3-T2, and T2-T0. Thus, co-digestion of PS and of CECL seems to be a promising approach for bioenergy recovery and promoting biowastes circularity.

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Section: Operational Parameters and Removal Efficienciessupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Energetic Valorization of Cereal and Exhausted Coffee Wastes Through Anaerobic Co-digestion With Pig Slurry

Sousa

Duarte

Mesquita

et al. 2021

Front. Sustain. Food Syst.

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“…The research is currently being carried out by the Italian Institute of Technology (IIT) [ 6 ]. There are also several reports on the production of polyhydroxyalkanoate (PHA) bioplastics from spent coffee grounds [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Green Coffee-Roasting Biogas with Modeling Valorization of Possible Solutions

Campo

Cerutti

Ravina

et al. 2020

IJERPH

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According to the European Union Directive 2009/28/EC, the goals of obtaining 20% of all energy requirements from renewable sources and a 20% reduction in primary energy use must be fulfilled by 2020. In this work, an evaluation was performed, from the environmental and energy point of view, of anaerobic digestion as a valid solution for the treatment of the byproducts obtained from the coffee-roasting process. In particular, thermophilic anaerobic digestion tests were carried out. Output values from the laboratory were used as input for the MCBioCH4 model to evaluate the produced flow of biogas and biomethane and two different biogas valorization alternatives, namely, the traditional exploitation of biogas for heat/energy production and biomethane conversion. The results of the preliminary simulation showed that a full-scale implementation of the coffee waste biogas production process is technically feasible and environmentally sustainable. Furthermore, the performed analysis validates a general methodology for energy production compatibility planning.

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Magnetically separable spent coffee grounds as a potential novel support for the covalent immobilization of β‐glucosidase for cellobiose hydrolysis

Bhardwaj,

Mishra,

Ghosh

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe industrial‐scale application of enzymes faces obstacles due to elevated costs and difficulties in stability and reuse. In this study, magnetic spent coffee grounds, an ecotoxic waste, have been utilized successfully for the first time to immobilize β‐glucosidase to overcome these challenges.RESULTSThe spent coffee grounds were magnetized and amine‐functionalized, followed by characterization using various techniques. Under optimized conditions, forming an imine bond between the functionalized support and β‐glucosidase resulted in a 62% immobilization yield (92.81 mg g−1 enzyme loading) and 12.5 U mg−1 activity after immobilization. A relatively small kinetic change was observed in the Km value (902 to 946 μmol L−1) after immobilization, suggesting minimal hindrance by AMSCG3 on substrate access or product release. Moreover, Glu@AMSCG3 showed exceptional stability (>90% residual activity) within a pH range of 3 to 6 after 2 h of incubation at 25 °C. A residual activity of 87.94% was maintained even at 80 °C and pH 5 after 2 h of incubation compared to the free β‐glucosidase, which showed only 6.5% residual activity at the same temperature. When cellobiose was hydrolyzed using Glu@AMSCG3 under optimum conditions, 91.33% cellobiose conversion was achieved initially, and over 79% conversion was maintained for 10 reusability cycles.CONCLUSIONThe improved stability of β‐glucosidase after covalent immobilization on amine‐modified magnetically separable spent coffee grounds indicates their potential as a support matrix for application in enzyme immobilization. © 2024 Society of Chemical Industry (SCI).

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Added-value molecules recovery and biofuels production from spent coffee grounds

Cited by 79 publications

References 121 publications

Energetic Valorization of Cereal and Exhausted Coffee Wastes Through Anaerobic Co-digestion With Pig Slurry

Energetic Valorization of Cereal and Exhausted Coffee Wastes Through Anaerobic Co-digestion With Pig Slurry

Evaluation of Green Coffee-Roasting Biogas with Modeling Valorization of Possible Solutions

Magnetically separable spent coffee grounds as a potential novel support for the covalent immobilization of β‐glucosidase for cellobiose hydrolysis

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