2022
DOI: 10.1007/s12649-022-01697-x
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Soil Amendments and Biostimulants from the Hydrothermal Processing of Spent Coffee Grounds

Abstract: Purpose Use of spent coffee grounds (SCG) in horticulture has deleterious effects on plant health and yields, suggesting that processing of SCG is necessary prior to field application. To this end, two products of an SCG based biorefinery were investigated: primary chars from the hydrothermal carbonisation (HTC) of SCG and enzymatic protein hydrolysates. Methods Primary chars were produced under various HTC regimes from raw SCG, and alkaline pre-treated SC… Show more

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Cited by 10 publications
(4 citation statements)
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“…The results showed that 10 kg/m of SCG enhanced weed control, reducing growth by 50%, whereas 5 kg/m of SCG improved the C and N contents [16]. Moreover, a recent study concluded that applying a pre-treatment on SCG, such as hydrothermal carbonization and alkali treatment, could also solve the toxicity effect of SCG components, as well as improve plant growth by increasing the rosette diameter, the number of new leaves, and the dry weight compared with untreated SCG [17]. Another study investigated the effect of SCG by-products in soil amendment, considering C and N values, such as biochar at 270 and 400 • C, hydrochar at 160 and 200 • C, defatted SCG, biochar from defatted SCG at 270 and 400 • C, and vermicompost [101].…”
Section: Soil Amendmentmentioning
confidence: 99%
See 1 more Smart Citation
“…The results showed that 10 kg/m of SCG enhanced weed control, reducing growth by 50%, whereas 5 kg/m of SCG improved the C and N contents [16]. Moreover, a recent study concluded that applying a pre-treatment on SCG, such as hydrothermal carbonization and alkali treatment, could also solve the toxicity effect of SCG components, as well as improve plant growth by increasing the rosette diameter, the number of new leaves, and the dry weight compared with untreated SCG [17]. Another study investigated the effect of SCG by-products in soil amendment, considering C and N values, such as biochar at 270 and 400 • C, hydrochar at 160 and 200 • C, defatted SCG, biochar from defatted SCG at 270 and 400 • C, and vermicompost [101].…”
Section: Soil Amendmentmentioning
confidence: 99%
“…Recent studies showed that SCGs have excellent potential to be used in agriculture because of their high amount of nutrients and low risk of heavy metal contamination [14,15]. Therefore, SCGs have already been reported to be a soil amendment or a top dressing to improve soil quality and control weeds [12,16,17], as well as composting with animal manure and other wastes to improve soil quality, enhance plant growth, and avoid intoxicating the soil [18,19]. Environmental pollution problems due to solid waste and new environmental regulations have forced the industry to pay more attention to waste management.…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, they play a crucial role in composting alongside animal manure and other organic waste materials, improving soil quality, stimulating plant growth, and ensuring soil remains free from toxicants. [21][22][23][24] In this context, the present study aimed to evaluate the effect of these waste materials as fertilizers for the cultivation of P. vulgaris (common bean), a plant of great economic and nutritional importance. Two types of fertilizers were prepared, a dry mixture and a wet mixture obtained by boiling the dry mixture in water for 15 min, and the germination and growth of the plants were monitored over a 4-week period.…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, they play a crucial role in composting alongside animal manure and other organic waste materials, improving soil quality, stimulating plant growth, and ensuring soil remains free from toxicants. [ 21–24 ]…”
Section: Introductionmentioning
confidence: 99%