Effectiveness of Black Sodier Fly (Hermetia Illucens) Larvae on Oxalate Content Degradation in Porang Flour Solid Waste Evi Kurniati (a), Dina Fitriana (b), Sang Aji Arif Setyawan (c), Satwika Desantina Muktiningsih (d*), Fajri Anugroho (e)
Faculty of Agricultural Engineering, Universitas Brawijaya
Jalan Veteran Malang, Indonesia
*satwika_dm[at]ub.ac.id
Abstract
Porang is a type of tuber that is widely used as flour. Porang flour has a high glucomannan content, which is 64.98%. This content is certainly very good for the food industry, especially to improve food texture. However, behind the high glucomannan content, Porang flour has a high oxalate content. The oxalate content is obtained from the light fraction in the process of making Porang flour which cannot be consumed. The oxalate content in the light fraction (solid waste) of Porang flour if not processed can endanger health and the environment. The alternatives to process the light fraction of flour is by utilizing Black Soldier Fly (BSF) larvae. Porang flour solid waste treatment in this study used BSF larvae aged from 5 until 15 days. The method used in this study was an experimental method using 2 treatments of feeding frequency for BSF larvae, gradually given feed with three days interval and one time given feed. Parameters measured include oxalate levels, WRI (Waste Reduction Index) and SR (Survival Rate). Based on the experiment it was proven that treatment of feed given to larvae could affect the performance of BSF larvae in degrading calcium oxalate content inside Porang solid waste. The results showed that the gradually given feed with three days interval treatment are better than one time given feed of Porang solid waste. Survival rate about 81,8% gradually given feed and 80,8% in one time given feed. WRI of 4,4% in gradually given feed and 4,06% in one time given feed. About 92,95% in gradually given feed and 88,06% in one time given feed reduction of oxalate levels in feed residue. Calcium oxalates that are reduced in feed residue are not accumulated inside larvae body but rather degraded. it was proved from the decrease of oxalates content inside its body from day 0 to 10, about 85,11% in gradually given feed and about 69,80% in one time given feed of oxalate content in larvae body were degraded
