OICC Press International Journal of Recycling of Organic Waste in Agriculture 2251-7715 12 4 2024 03 08 Utilization of black soldier flies to reduce grease waste and support zero waste 10.30486/ijrowa.2023.1981992.1611 EN Deffi Ayu Puspito Sari Department of Environmental Engineering, Universitas Bakrie, Jakarta 12940, Indonesia 0000-0002-7679-7496 Amelia Thufailah Mumtaz Department of Environmental Engineering, Universitas Bakrie, Jakarta 12940, Indonesia 0009-0003-1722-2857 Diki Surya Irawan Department of Environmental Engineering, Universitas Bakrie, Jakarta 12940, Indonesia Prismita Nursetyowati Department of Environmental Engineering, Universitas Bakrie, Jakarta 12940, Indonesia Aurino Djamaris Department of Management, Universitas Bakrie, Jakarta 12940, Indonesia Journal Article 2024 03 08 Purpose: This study analyzed the ability of Black Soldier Flies Larvae (BSFL) in reducing grease waste and the effect of variation in feed composition on the growth rate effect of larvae age at 8 days, 12 days, and 16 days.Method: Before reaching the specified age (8, 12, or 16 days), the larvae are fed a mixture of expired bread and expired milk. BSFL at ages 8 days, 12 days, and 16 days are fed by pure grease waste or the mixing of grease waste and expired milk until turned into 20-day-old larvae. Then waste reduction is analyzed based on parameters such as feed consumption, waste reduction index, the efficiency of conversion of digested feed, and larvae biomass. Univariate analysis using SPSS was conducted to determine the significance of differences in waste reduction, feed consumption, conversion efficiency of digested feed, and larvae biomass among the experimental groups.Results: The 16-day-old larvae fed with pure grease waste achieved a waste reduction index of 20.08 grams per day. Moreover, variations in feed composition influenced the growth rate of BSFL, with larvae fed a mixture of grease waste and expired milk exhibiting the largest weight (43 mg) and length (1.4 cm) among the 16-day-old larvae.Conclusion: Black Soldier Fly Larvae at 16 days old displayed remarkable effectiveness in reducing grease waste from restaurants. This study underscores the potential of BSFL as a sustainable waste management and recycling solution for organic waste, particularly in the context of food waste.