Conversion of spent coffee grounds into vermicompost

Hanč, Aleš; Hřebečková, Tereza; Grasserová, Alena; Cajthaml, Tomáš

doi:10.1016/j.biortech.2021.125925

Cited by 18 publications

(10 citation statements)

References 44 publications

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“…(Samal et al, 2019). In this sense, it is worthwhile to note that vermicomposting, which is usually performed at a low scale, is typically applied to agricultural waste and manure, rather than food waste (Ahmed and Deka, 2021;Hanc et al, 2021).…”

Section: Vermicomposting As a Complement Of Home Compostingmentioning

confidence: 99%

Decentralized Composting of Food Waste: A Perspective on Scientific Knowledge

Sánchez

2022

Front. Chem. Eng.

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Composting has been demonstrated to be an effective and sustainable technology to treat a wide variety of organic wastes. A particular aspect of composting is the number of technological options that can be used, from full-scale plants to small composters. In this sense, the interest in composting at home or on a community scale is exponentially growing in recent years, as it permits the self-management of organic wastes and obtaining compost that can be used by the same producer. However, some questions about the quality of the obtained compost or the environmental impact of home composting are still in an early stage of development and provide little knowledge. In this review, the main points related to home and community composting are analysed in detail according to the current scientific knowledge by highlighting their advantages and possible drawbacks. Particularly, the composting process performance is analysed, with temperature stratification being one of the main problems related to small amounts of organic matter. Simultaneously, compost quality is determined using parameters such as stability and/or maturity, concluding that home compost can be similar to industrial compost in both aspects. However, sanitisation of home compost is not always achieved. Regarding its environmental impact, gaseous emissions, especially greenhouse emissions, are the most studied category and are generally low. Finally, the effects of pandemics on home composting are also preliminary commented, concluding that this strategy can be a good alternative to have cities that are more resilient.

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Section: Vermicomposting As a Complement Of Home Compostingmentioning

confidence: 99%

Decentralized Composting of Food Waste: A Perspective on Scientific Knowledge

Sánchez

2022

Front. Chem. Eng.

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“…Straw is as an important bulking agent because it matures compost and vermicompost faster as evidenced by decreased enzymatic activities. A great proportion of straw pellets proved successful in vermicomposting coffee grounds ( Hanc et al, 2021 ). The greatest earthworm number and biomass were in the treatment with 75% straw pellets.…”

Section: Discussionmentioning

confidence: 99%

“…Gas chromatography–mass spectrometry (450-GC, 240-MS Varian, Walnut Creek, CA, United States) was employed for determination of fatty acid methylated esters. The details of the analyses are described in Hanc et al (2021) .…”

Section: Methodsmentioning

confidence: 99%

Differences of Enzymatic Activity During Composting and Vermicomposting of Sewage Sludge Mixed With Straw Pellets

2022

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The study aims were focused on profiling eight hydrolytic enzymes by fluorescence method using a multifunctional modular reader and studying the proportion of basic microorganism groups during composting and vermicomposting of sewage sludge mixed with straw pellets in several proportions (0, 25, 50, 75, and 100%). The greatest decrease in enzymatic activity occurred in the first half of composting and vermicomposting. After 4 months of these processes, the least enzymatic activity was observed in the sludge with 50% and also 25% straw addition, indicating that straw is an important means for the rapid production of mature compost from sewage sludge. Enzymatic activity was usually less in the presence of earthworms than in the control treatment because some processes took place in the digestive tract of the earthworm. For the same reason, we observed reduced enzyme activity during fresh feedstock vermicomposting than precomposted material. The final vermicompost from fresh feedstocks exhibited less microbial biomass, and few fungi and G− bacteria compared to precomposted feedstock. The enzymatic activity during composting and vermicomposting of sewage sludge and their mixtures stabilized at the following values: β-D-glucosidase—50 μmol MUFG/h/g dw, acid phosphatase—200 μmol MUFP/h/g dw, arylsulphatase—10 μmol MUFS/h/g dw, lipase—1,000 μmol MUFY/h/g dw, chitinase—50 μmol MUFN/h/g dw, cellobiohydrolase—20 μmol MUFC/h/g dw, alanine aminopeptidase—50 μmol AMCA/h/g dw, and leucine aminopeptidase—50 μmol AMCL/h/g dw. At these and lesser values, these final products can be considered mature and stable.

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“…Nutrient density increases in coffee plantations have been reported using SCG as part of fertilisers [ 49 ]. Potentially toxic responses to SCG to soil due to caffeine and high amounts of antioxidants [ 50 ] can be decreased by farming earthworms to decrease the caffeine content of SCG [ 51 , 52 ], making SCG then usable for the composting and fertilising industry.…”

Section: Value-adding To Scg Outside the Health Industrymentioning

confidence: 99%

The Potential of Spent Coffee Grounds in Functional Food Development

et al. 2023

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Coffee is a popular and widely consumed beverage worldwide, with epidemiological studies showing reduced risk of cardiovascular disease, cancers and non-alcoholic fatty liver disease. However, few studies have investigated the health effects of the post-brewing coffee product, spent coffee grounds (SCG), from either hot- or cold-brew coffee. SCG from hot-brew coffee improved metabolic parameters in rats with diet-induced metabolic syndrome and improved gut microbiome in these rats and in humans; further, SCG reduced energy consumption in humans. SCG contains similar bioactive compounds as the beverage including caffeine, chlorogenic acids, trigonelline, polyphenols and melanoidins, with established health benefits and safety for human consumption. Further, SCG utilisation could reduce the estimated 6–8 million tonnes of waste each year worldwide from production of coffee as a beverage. In this article, we explore SCG as a major by-product of coffee production and consumption, together with the potential economic impacts of health and non-health applications of SCG. The known bioactive compounds present in hot- and cold-brew coffee and SCG show potential effects in cardiovascular disease, cancer, liver disease and metabolic disorders. Based on these potential health benefits of SCG, it is expected that foods including SCG may moderate chronic human disease while reducing the environmental impact of waste otherwise dumped in landfill.

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Conversion of spent coffee grounds into vermicompost

Cited by 18 publications

References 44 publications

Decentralized Composting of Food Waste: A Perspective on Scientific Knowledge

Decentralized Composting of Food Waste: A Perspective on Scientific Knowledge

Differences of Enzymatic Activity During Composting and Vermicomposting of Sewage Sludge Mixed With Straw Pellets

The Potential of Spent Coffee Grounds in Functional Food Development

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