Student Research Reports

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This study investigates the effect of a natural powder made from dried coffee waste and crushed eggshells on greywater quality and tomato plant growth. The research aims to reduce water pollution and reuse household waste in an environmentally friendly way. Two water samples were tested: greywater with the added powder and greywater without any treatment. Water temperature, pH , and electrical conductivity were measured before and after adding the powder. Two tomato plants were irrigated using the two water types to observe plant growth and soil water retention . The results showed that adding the powder slightly reduced water temperature, stabilized pH, and decreased electrical conductivity , indicating lower salinity. The tomato plant irrigated with treated greywater showed stronger growth, greener and thicker leaves, and better soil water retention. These findings suggest that coffee waste and eggshell powder can improve greywater quality, reduce salinity stress , enhance soil moisture retention, and support healthie plant growth. This project demonstrates a simple, low-cost, and sustainable method that benefits agriculture, water reuse, and the environment.