3.6. Biodiesel production from BSFL grease
After 10 days co-conversion with the aid of Rid-X (0.35%, w/w),about 43.8 g biodiesel was produced by a two-step method from 2000 BSFL grown on 1000 g mixed feed of rice straw (30%) and RSW(70%). The properties of BSFL grease were described in Table 4, the
results showed great similarities to the previous reports [16,17]. It is indicated that BSFL grease held a quite stable property in different feeding conditions. This larval grease is suitable to serve as the feedstock of biodiesel when compared with rapeseed oil. Furthermore, the properties of this BSFL grease based biodiesel further demonstrated that BSFL grease is suitable for biodiesel production.The compositions of FAME (fatty acid methyl ester) in BSFL biodiesel were presented in Table 5. With a little change in the relative content, FAME compositions of BSFL biodiesel from this study were very close to the fatty acids profile of BSFL fed on other type of
waste [17]. In the meantime, the properties of BSFL biodiesel were comparable to rapeseed biodiesel, and most of the factors were in reasonable agreement with the specifications of standard EN 14214 as shown in Table 6. It is further demonstrated that BSFL grease could be a viable biodiesel feedstock and this insect based biodiesel
could be a promising substitute of conventional diesel fuel.
The major challenge of biofuel production from lignocellulose is the pretreatment [26]. BSFL provided a potential feedstock for biodiesel to bypass this complex pretreatment. With the aid of RidX, BSFL possesses a good ability to manage organic waste and