What are the physical and chemical properties of waste coffee grounds in construction industry?
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Waste coffee grounds have been studied for their physical and chemical properties in the construction industry. The characterization of coffee husks ash (CHA) showed that as the replacement percentage increased, the crystalline material increased, silicate concentration decreased, and micro pores or air voids increased, leading to a decrease in the strength of concrete . Spent coffee grounds (SCGs) were found to have potential as bio-waste modifiers in asphalt binders, improving their shearing stress-resistant ability and high-temperature performance, as well as enhancing low-temperature stability . A spent coffee grounds/potato starch bio-based composite was analyzed and found to have thermal insulation properties comparable to conventional materials and acoustic absorption coefficients similar to other building materials . Coffee waste incorporated into plaster was shown to enhance thermal characteristics while decreasing mechanical performance, with an optimal combination of 6% coffee grounds and a 0.7 water mixing ratio . Coffee waste, specifically spent coffee grounds, was found to be an excellent raw material for biomass with high calorific value and low ash content, suitable for thermal conversion systems .
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01 Feb 2023 | The provided paper does not provide information about the physical and chemical properties of waste coffee grounds in the construction industry. |
| The provided paper does not mention the physical and chemical properties of waste coffee grounds in the construction industry. |
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What are the philippine study in waste coffee grounds in CHB?5 answersThe study conducted by Le et al. aimed to broaden the diversity of uses for spent coffee grounds (SCG) in the Philippines. They explored the potential of SCG for bioactive components, biodiesel production, activated carbon (AC) manufacturing, and fuel pellet production. Another study by Marais focused on recycling coffee residues by incorporating them into red clay for 3D printing. The study evaluated the morphological, chemical, physical, and mechanical properties of the clay paste mixed with different percentages of coffee grounds. Additionally, Marchetti and Vasmara evaluated the biomethanation potential of SCG alone or in co-digestion with pig slurry. The study found that SCG can be a suitable feedstock for biogas production and can increase biogas yields when used as a co-substrate with pig slurry. Eliche-Quesada et al. assessed the viability of mixing coffee grounds with raw clay for the production of clay bricks. They found that incorporating small amounts of coffee grounds resulted in open cell porosity, while higher amounts led to closed cell porosity with higher insulating capacity.
How can spent coffee grounds be effectively utilized to address environmental and economic challenges?4 answersSpent coffee grounds (SCGs) can be effectively utilized to address environmental and economic challenges. SCGs are a significant waste source that can be reused, recycled, or converted into valuable products. They have shown potential for producing biofuels, fertilizers, animal feed, high-value chemicals, cosmetics, and pharmaceutical products. Additionally, SCGs can be used as adsorbents for the removal of pesticides from water and fruit extracts, providing a solution for pesticide contamination. The properties of coffee grounds, such as their morphological structure and composition, can be analyzed to determine their potential applications, such as electrochemical energy storage for electronics. Furthermore, SCGs can be extracted using green technologies, such as carbon dioxide in supercritical and liquid conditions, to obtain extracts with high antioxidant activity and bioactive compounds that can be used in the cosmetic, pharmaceutical, and food sectors. Finally, SCGs can be converted into activated charcoal, which can be used as an active ingredient in liquid bath soap formulations, providing a sustainable and value-added product.
What happens to Coffee waste?5 answersCoffee waste can be converted into value-added products through recycling, recovery, or energy valorization. By-products generated from coffee production, such as coffee leaves, flowers, pulps, husks, silverskin, and spent coffee grounds, can be utilized to extract or produce compounds like lipids, lignin, cellulose, tannins, antioxidants, caffeine, polyphenols, carotenoids, flavonoids, and biofuel. Coffee silverskin, the thin epidermis covering the coffee bean, has been used in cosmetic applications, as it contains bioactive molecules like cafestol, kahweol fatty acid esters, acylglycerols, β-sitosterol, and caffeine. Coffee waste, including coffee silverskin and spent coffee grounds, has the potential to be used as functional ingredients in food systems due to their high concentration of fiber, colorant pigments, and antioxidant compounds. Coffee waste can also be utilized in applications such as animal feeding, enzyme production, composting, biogas and bioethanol production, wastewater treatment, and as a replacement for food ingredients and mimicking materials. Overall, coffee waste can be managed with clean technologies and long-term waste management strategies to reduce the economic and environmental burdens of coffee processing in a sustainable manner.
What are the effects of coffee grounds on the growth of acid-loving plants?5 answersCoffee grounds have various effects on the growth of acid-loving plants. The application of coffee grounds before emergence of Urochloa brizantha significantly reduces its growth. Additionally, coffee grounds added to soil increase sorption properties and decrease pH of the soil solution, which can negatively impact plant growth and development. In the case of horticultural plants, direct application of spent coffee grounds (SCG) suppresses their growth regardless of soil type and fertilizer addition. This growth suppression is likely due to phytotoxic effects rather than changes in soil pH or nitrogen availability. However, coffee grounds can be used as a fertilizer to promote the growth of microalgae, as they provide carbon and nutrients such as nitrogen and phosphorus. Overall, the effects of coffee grounds on acid-loving plants depend on the specific plant species and the stage of growth.
What are the effects of coffee grounds on acid-loving plants?5 answersCoffee grounds have been found to have negative effects on acid-loving plants. The addition of granulated coffee grounds to soil was found to decrease the pH of the soil solution. In a study investigating the direct application of spent coffee grounds (SCG) on plant growth, it was observed that all horticultural plants grew poorly in response to SCG, regardless of soil type and fertilizer addition. Additionally, the growth of Urochloa brizantha, an invasive plant, was compromised when coffee grounds were applied during pre-emergence and in low concentrations. These findings suggest that coffee grounds can have detrimental effects on the growth and development of acid-loving plants.
Properties of coffee grounds why it can be used as plant fertilizer?4 answersCoffee grounds can be used as a plant fertilizer because they contain primary nutrients and can increase the content of soil organic matter. Spent coffee grounds (SCG) have a relatively high porosity and absorbance, which can help reduce the amount of water required for irrigation. When mixed with green algae biomass and urea, coffee grounds can be used to produce organic bulk fertilizer, which has higher value products for plant nutrition. Additionally, coffee grounds have been found to have high carbon content and amorphous material properties, making them suitable for use as an organic soil amendment. They also contain lipids, caffeine, and polyphenols, which can contribute to their effectiveness as a soil amendment. Coffee grounds can improve soil physical properties by increasing water retention, total porosity, and reducing soil bulk density. Overall, the chemical and physical properties of coffee grounds make them a viable option for use as a plant fertilizer and soil amendment.