2025, Vol. 8, Issue 1, Part G

author(s)
Abhijeet Pisal, JS Ghatge, SB Patil, AM Gore and RV Powar

abstract
The black soldier fly (BSF) is widely recognized as a valuable protein supplement for aquaculture and poultry farming due to its larval composition, which includes 40% crude protein, 33% crude fat, 15% ash, and 12% crude fibre. BSF larvae are highly effective in bio converting organic waste within a short period and can thrive on substrates such as kitchen waste, fruits, and vegetables. Additionally, BSF does not pose any risks as a pest or vector in its adult stage. However, the separation of larvae from waste material presents significant challenges in field applications. To address these issues, a differential separation trommel screener was developed and evaluated. Conventional vibrating screens used for separating BSF larvae often encounter issues with impurity removal and efficiency. This study aimed to develop, and assess the performance of an optimized BSF larvae separation machine. The study focused on key operational parameters, including the rotational speed of the screening cylinder and its angle of inclination, and evaluated their effects on performance metrics such as throughput capacity, output capacity, and screening efficiency. Optimal operational settings were determined to be a screening cylinder rotation speed of 20 rpm and an inclination angle of 9°, resulting in a throughput capacity of 1.02 t/h, an output capacity of 95.3 kg/h, and a screening efficiency of 93.43%. The operating cost was calculated at ₹130 per hour or ₹160 per ton, highlighting the machine's cost-effectiveness. The developed BSF larvae separation machine features a user-friendly design, reliable performance, and the ability for continuous operation. Currently deployed in waste processing plants, it offers an efficient and scalable solution for mechanical waste screening and larvae separation, addressing a critical bottleneck in BSF-based waste management systems.