Bioconversion of organic wastes into biodiesel and animal feed via insect farming

K.C. Surendra, Robert Olivier, Jeffery K. Tomberlin, Rajesh Jha, Samir Kumar Khanal

Department of Molecular Biosciences and Bioengineering, University of Hawai‘i at Mānoa, Honolulu, HI, 96822, USA.

Abstract

Approximately one-third of all food produced for human consumption worldwide is wasted. The current waste management practices are not only costly but also have adverse impact on environment. In this study, black soldier fly (BSF) (Hermetia illucens) larvae were grown on food wastes to produce fat and protein-rich BSF prepupae as a novel strategy for efficient organic waste management. The lipid content in BSF prepupae was characterized for fatty acids profile. Whole BSF prepupae, pressed cake, and meal were analyzed for important animal feed characteristics. BSF-derived oil has high concentration of medium chain saturated fatty acids (67% total fatty acids) and low concentration of polyunsaturated fatty acids (13% total fatty acids), which makes it potentially an ideal substrate for producing high quality biodiesel. BSF (prepupae, pressed cake, and meal) has feed value comparable to commercial feed sources. Thus, the bioconversion of organic waste into BSF prepupae has significant potential in generating high-value products with simultaneous waste valorization.

Keywords: Organic wastes; Insect farming; Black soldier fly; Biodiesel; Animal feed.