Extraction of oil from black soldier fly larvae (BSFL) based industrial sludge via cold-pressed method
DOI:
https://doi.org/10.24191/mjcet.v9i2.8996Keywords:
Black Soldier Fly Larvae, Tofu sludge, Soya drink sludge, Sludge treatment, Oil extractionAbstract
Black soldier fly larvae (BSFL) are increasingly utilised to decompose organic waste due to their efficiency in waste composting, nutrient recovery, and income generation. This study investigated the suitability of soy-based industrial sludges, specifically from tofu and soy drink processing that is rich in valuable nutrients, especially protein, as substrate for BSFL. The growth of BSFL fed with these sludges was monitored, and the resulting BSFL oil was extracted using a cold-pressing method. FTIR analysis confirmed the presence of protein and fatty acids in both sludge types. Experimental results indicated that the weight and length of larvae increased when fed with wet sludges. However, both weight and length decreased when they were fed with dry sludges, suggesting a BSFL preference for nutrient absorption under high moisture conditions. After 14 days, average larval lengths reached 1.54 cm and 1.43 cm for those fed with wet tofu and wet soya drink sludges, respectively. The extracted BSFL oil consists of lauric acid, palmitic acid and traces of myristic acid. The presence of both protein and lipids in BSFL indicates its potential as a valuable ingredient for animal feed.
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