Tubular Drum Biowaste Processing with Segmented Rearing Chambers
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Solution Overview
Problem
Current insect-based biowaste processing methods face inefficiencies such as poor operational surface utilization, anaerobic decomposition, temperature regulation issues, and limited continuous processing capabilities, leading to reduced biomass processing efficiency and inconsistent insect protein availability.
Innovation Solution
A tubular drum with a shaftless screw conveyor and circumferentially spaced cantilevered blades creates longitudinally spaced rearing chambers for uniform insect larval development, allowing for slow drum rotation and continuous processing, with a control system to monitor and adjust parameters for optimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the drum is rotated at a high rate to facilitate mixing and aeration, then heat dissipation and oxygen supply are improved, but the metabolic activity of the insect larvae is limited
Solution Approach 1:
The drum is segmented into multiple rearing chambers (first, second, and third chambers) that are spatially separated along the drum's length. This segmentation allows different rotational speeds to be applied to different chambers, enabling the first chamber to rotate at a higher speed for heat dissipation and aeration, while the second and third chambers rotate at lower speeds to preserve larval metabolic activity and facilitate continuous processing.
2Productivity
If the drum rotates slowly to maintain larval metabolic activity, then insect protein is produced, but the processing is not continuous and significant delay time occurs
Solution Approach 1:
The drum is divided into multiple rearing chambers that can rotate at different speeds. The first chamber rotates at a higher speed for initial processing, while the second and third chambers rotate at lower speeds to maintain larval metabolism. This segmented approach enables continuous processing without requiring the entire drum to rotate slowly, thereby reducing the delay time between larval introduction and discharge.
Solution Approach 2:
The system is designed to enable continuous processing by having larvae progress through multiple rearing chambers in sequence. The second and third chambers are configured to maintain larval metabolic activity while allowing continuous flow, ensuring that insect protein production is ongoing without significant interruptions or delay times.
3Temperature
If flat trays with maximum height of 30-40 cm are used, then insect larvae can access air supply, but operational surface utilization is poor and anaerobic decomposition occurs
Solution Approach 1:
The system transitions from flat trays to a curved, cylindrical drum configuration. This curvature allows the biowaste to be arranged in a three-dimensional cylindrical shape, maximizing the use of vertical space and operational surface area. The cylindrical geometry ensures that air can penetrate throughout the biowaste mass while maintaining high surface utilization, preventing anaerobic decomposition.
4Ease of operation
If the drum is used as a batch processor with all larvae discharged at the same time, then simple operation is maintained, but the processor cannot function continuously and insect protein is not readily available
Solution Approach 1:
The drum is segmented into multiple rearing chambers that can operate at different rotational speeds. This segmentation enables the system to function as a continuous processor, where larvae progress through different chambers and can be discharged at different times based on their development stage. The second and third chambers are configured to maintain continuous processing capability while keeping operational complexity manageable.
Data Source
AI summary
Continuous insect-based biowaste processing apparatus has a tubular drum; a drive for rotatably driving the drum; a shaftless screw conveyor fixedly connected to an inner surface of the drum; circumferentially spaced cantilevered blades that (a) are connected to the inner drum surface and (b) each longitudinally extends throughout the drum; and a mechanism for introducing a conglomerate portion that includes biowaste and insect larvae into the drum interior. The screw conveyor is subdivided into longitudinally spaced chambers for the introduced insect larvae, each of the chambers being defined by two adjacent flights of the screw conveyor and by the blades. The size of the insect larvae progressively increases within a more distally located rearing chamber. Two or more blades firmly hold and unify the conglomerate portion throughout its residing time within the drum interior while being distally conveyed.