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Bionic stirring device for horizontal composter to improve aeration efficiency: : Design and optimisation using discrete and finite element methods

Published: 01 October 2024 Publication History

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Highlights

Bionic stirring device to enhance food waste composting was designed.
Design parameter of stirring device using discrete element method was optimized.
Failure risk analysis of stirring device undertaken using finite element method.
Conditions found for optimal stirred material fluffiness validated via test bench.
Insights can aid design of compost stirring and stirring devices.

Abstract

Effective stirring devices are essential for horizontal composting to enhance food waste disintegration, but studies on flexible compost stirrers, their fracture risk, and prevention methods are limited. This study developed an innovative design for a bionic stirring device in a horizontal compost bin to enhance the food waste composting process by improving the dissolved oxygen levels. Three-dimensional models of primary particles from a standard food waste sample were utilised, and the design parameters of the stirring device were optimised using the discrete element method. A regression analysis of the test results was performed using the response surface method to investigate the effects of variables such as the stirring shaft speed, torsion spring diameter, and material filling volume on the fluffiness of the post-stirring material and to explore the mechanism of the bionic tumbling device on the fluffiness of the compost material. A failure risk analysis of the stirring device was also performed using the finite element method. The research findings indicate that optimal fluffiness of the stirred material can be achieved with a stirring shaft speed of 0.24 r/s, torsion spring diameter of 5.5 mm, and material filling volume of 70 %. Realistic validation experiments confirmed that the optimal biomimetic mixing structure improved material fluffiness by 18.69 % (measured as volume change in the upper layer of the pile) and reduced the risk of structure failure with a strain of 0.00038. This research provides a reliable design method for horizontal compost bin stirring devices, contributing to enhanced composting efficiency and serving as a valuable reference for the design of other compost stirring devices.

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                cover image Computers and Electronics in Agriculture
                Computers and Electronics in Agriculture  Volume 225, Issue C
                Oct 2024
                1555 pages

                Publisher

                Elsevier Science Publishers B. V.

                Netherlands

                Publication History

                Published: 01 October 2024

                Author Tags

                1. Composting
                2. Discrete element method
                3. Failure analysis
                4. Food waste
                5. Stirring device

                Author Tags

                1. ANOVA
                2. BBD
                3. CV
                4. DEM
                5. FEM
                6. FFV
                7. GHG
                8. RSM
                9. SFW
                10. SRS
                11. SV
                12. TSD
                13. VD

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