Fruit and vegetable waste (FVW) have a potential value as renewable material. CORS (Conversion of Organic Refuse by Saprophages) technology, mediated by black soldier fly (BSF), Hermetia illucens L., can contribute to the development of supply chains within green economy and green chemistry. Within the Hermes project, a pre-prototype level study was carried out with FVW provided by a supermarket during the span of one year. Mixtures with bread, bran, brewers‟ spent grains, or dry-inert material, such as sawdust and cellulose ramekins, were prepared to reduce moisture and used as feeding substrate for larvae of BSF (BSFL). Six-day-old BSFL were used for tests carried out „in batch' (feeding substrate supplied once at the beginning), with low larval densities (2 BSFL/cm2) and high larval density (4 BSFL/cm2). Bioconversion took 6÷13 days, depending on the composition of the substrate. Mixtures with bread, bran and spent grains gave higher moisture reduction and higher waste reduction than the addiction of dry inert material. The higher the larval density, the lower the individual larval weight and its dry matter. However, high larval density gave highest production of lipid and protein, respectively, 261.6 g and 163.7 g with 10 kg of waste. © 2023 ETA-Florence Renewable Energies.