Effect of different rates of spent coffee grounds (SCG) on composting process, gaseous emissions and quality of end-product

Santos, Cátia; Fonseca, João; Aires, Alfredo; Coutinho, João; Trindade, Henrique

doi:10.1016/j.wasman.2016.10.020

Cited by 83 publications

(68 citation statements)

References 35 publications

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“…After the extraction, solid Spent Coffee Grounds (SCG) remains as a wet solid waste. From 1 tonne of raw coffee beans are produced about 550-650 kg of SCG, with a moisture content between 55 and 88% in dry basis, depending on the extraction process used [3,4]. SCG has a high pollutant potential because of the toxic nature of substances contained like caffeine, tannins or polyphenols and requires high quantities of oxygen to degrade it [5,6].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Biomass Briquettes from Spent Coffee Grounds and Xanthan Gum Using Low Pressure and Temperature

et al. 2019

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This paper analyzes the ability of the SCG for briquettes production based on the use of xanthan gum as binder under low pressure and low temperature biomass manufacturing conditions. Briquettes were manufactured at room temperature, at 10, 15, 20, 25 and 30% of moisture content and 8, 10 and 12 MPa of compaction pressure. Raw SCG samples reached dry densities between 0.669 and 0.735 g/cm 3 for the samples with a moisture content of 15% and 8 MPa, and 10% and 12 MPa, respectively. Samples treated with 10% of xanthan gum got densities between 0.672 and 0.819 g/cm 3 depending on the moisture content and the compaction pressure. No one of the raw SCG combinations passed the durability test meanwhile xanthan ones with 30% of moisture content obtained the best results with a loss of mass of 9.1% for the combination compacted at 10 MPa. Raw SCG samples showed water absorption values between 0.498% and 0.846% meanwhile xanthan samples water absorption oscillated between 0.427% and 1.065%. Xanthan gum increased the SCG ashes content from 0.66% to 0.97% and decreased the Lower Heating Value (LHV) from 25,399 J/g of the pure raw SCG to 23,503 J/g. Thermogravimetric tests showed that xanthan gum mix compared to the raw SCG increased as well the volatile peak from 61.54 mW to 81.94 mW as the mass loss rate in the volatile stage from-0.0178 mg/s to-0.0184 mg/s.

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Section: Introductionmentioning

confidence: 99%

Characterization of Biomass Briquettes from Spent Coffee Grounds and Xanthan Gum Using Low Pressure and Temperature

et al. 2019

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“…SCGs are commonly treated as organic waste and sent to composting plants or in the unsorted garbage that it is fired in incinerator power plants [4]. However, SCGs have multipls interesting properties for a wide range of applications—anaerobic co-digestion with different waste feedstocks for biogas production [5,6], composting processes [7], nutrient for fungi growing [8], nutrient for ruminant feed [9], fertilizer for agricultural soil [10], ethanolic extraction [11], adsorption of pollutants for water treatments [12], geopolymers [13], etc. A SCGs-based biorefinery for the production of biofuels, biopolymers, antioxidants, and biocomposites is studied in the literature [14].…”

Section: Introductionmentioning

confidence: 99%

Spent Coffee Grounds in the Production of Lightweight Clay Ceramic Aggregates in View of Urban and Agricultural Sustainable Development

et al. 2019

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This paper presents an innovative application for spent coffee grounds (SCGs) used as filler for the formulation of lightweight clay ceramic aggregates (LWA). LWA can be used for urban and agricultural purposes as a sustainable solution. Spent coffee grounds were tested as a pore forming agent partially acting as a replacement for red clay in material formulation before firing. Substitutions of 10, 15, and 20 wt.% of red clay were tested. The properties of lightweight aggregates with 15 wt.% of SCGs were improved using a specifically tailored fertilizer glass due to its low pH and conductivity within the soil tolerance range. Packaging glassy sand, cattle-bone flour ash, and potassium carbonate were mixed and melted in order to obtain this glass, which when added to the clayey batch functionalized the aggregates by phosphorus and potassium nutrients. The results (in particular, porosity and bulk density) show that the lightweight aggregates obtained have interesting properties for possible uses both in urban (e.g., green roofs as a drainage layer) and agricultural purposes. Moreover, pH and conductivity are in line with the Italian Standard regarding soil amendment (D.lgs. 75/2010). In addition, several leaching tests were performed in a solution containing 2 vol.% citric acid (C6H8O7) to evaluate the release capacity not only of nutrients (P and K) but also to check the presence and release of heavy metals, such as lead (Pb), that may come from the glassy precursor. The results obtained showed that nutrients are efficiently released in 21 days (P = 87.73% and K = 25.74% of released percentage) and Pb release is under the standard threshold of 30 ppm.

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“…4 Only 7% of this spent coffee grounds were used in worm farms and gardens and 93% ended up in landfill 4 where it poses a risk to environmental health with potential toxicity to aquatic organisms and production of greenhouse gases. 40,41 Here, we studied the potential health benefits of spent coffee grounds in a rat model of metabolic syndrome induced by a high-carbohydrate, high-fat diet. Spent coffee grounds reduced body weight, abdominal fat, total body fat mass, systolic blood pressure, and concentrations of plasma triglycerides and non-esterified fatty acids along with improved glucose tolerance and structure and F I G U R E 5 Effect of spent coffee grounds supplementation on the ratio of Firmicutes and Bacteriodetes abundances (F/B) (natural log) in the gut of rats.…”

Section: Discussionmentioning

confidence: 99%

Modulation of gut microbiota by spent coffee grounds attenuates diet‐induced metabolic syndrome in rats

et al. 2020

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Coffee brewing produces spent coffee grounds as waste; few studies have investigated the health benefits of these grounds. This study investigated responses to spent coffee grounds in a diet‐induced rat model of metabolic syndrome. Male Wistar rats aged 8‐9 weeks were fed either corn starch‐rich diet or high‐carbohydrate, high‐fat diet for 16 weeks, which were supplemented with 5% spent coffee grounds during the last 8 weeks. Rats fed non‐supplemented diets were used as controls. High‐carbohydrate, high‐fat diet‐fed rats developed metabolic syndrome including abdominal obesity, impaired glucose tolerance, dyslipidemia, and cardiovascular and liver damage. Body weight, abdominal fat, total body fat mass, systolic blood pressure, and concentrations of plasma triglycerides and non‐esterified fatty acids were reduced by spent coffee grounds along with improved glucose tolerance and structure and function of heart and liver. Spent coffee grounds increased the diversity of the gut microbiota and decreased the ratio of Firmicutes to Bacteroidetes. Changes in gut microbiota correlated with the reduction in obesity and improvement in glucose tolerance and systolic blood pressure. These findings indicate that intervention with spent coffee grounds may be useful for managing obesity and metabolic syndrome by altering the gut microbiota, thus increasing the value of this food waste.

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Effect of different rates of spent coffee grounds (SCG) on composting process, gaseous emissions and quality of end-product

Cited by 83 publications

References 35 publications

Characterization of Biomass Briquettes from Spent Coffee Grounds and Xanthan Gum Using Low Pressure and Temperature

Characterization of Biomass Briquettes from Spent Coffee Grounds and Xanthan Gum Using Low Pressure and Temperature

Spent Coffee Grounds in the Production of Lightweight Clay Ceramic Aggregates in View of Urban and Agricultural Sustainable Development

Modulation of gut microbiota by spent coffee grounds attenuates diet‐induced metabolic syndrome in rats

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