Soil Saver 3000: The Future of Composting

Overview

Abstract Objective Food waste decomposing in landfills is a major contributor to global warming because it releases harmful greenhouse gases, especially methane. Composting offers a sustainable solution, but many composting systems are slow, expensive, or inconvenient for household use. The purpose of this project was to design and build a compact composting machine that uses dehydration and grinding to significantly reduce food waste volume while producing safe, nutrient-rich compost. Methods The composting machine prototype was constructed using a combination of common and unconventional materials. A rice cooker was repurposed as the composting bin, with its built-in hot plate providing the heat required for dehydration. A DC motor equipped with a grinding blade was mounted onto the lid to break down food scraps. For safety and control, a temperature sensor, an on/off switch, and a speed control dial were installed. To evaluate effectiveness, multiple trials were conducted. Food scraps were chopped, placed into the bin, dehydrated, allowed to cool, and then ground. This drying and grinding cycle was repeated until the material was reduced to a fine powder. Results The composting process resulted in an average weight reduction of 92.3% and an average volume reduction of 96%. The final compost had an average pH of 6.8, indicating a nutrient-rich and plant-safe product. Conclusion The results demonstrate that the composting machine effectively reduces food waste while producing safe, usable compost. This system shows promise as an efficient, household-friendly solution for reducing landfill waste and mitigating greenhouse gas emissions.

Competition history

• CSEF 2026 Environmental Engineering (Track 2) (Junior Division) · Entry J-12-06

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