In-situ yeast fermentation to enhance bioconversion of coconut endosperm waste into larval biomass of hermetia illucens: Statistical augmentation of larval lipid content

Chung Yiin Wong, Muhammad Naeim Mohd Aris, Hanita Daud, Man Kee Lam, Ching Seong Yong, Hadura Abu Hasan, Siewhui Chong, Pau Loke Show, Oetami Dwi Hajoeningtijas, Yeek Chia Ho, Pei Sean Goh, Husnul Kausarian, Guan Ting Pan, Jun Wei Lim

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The aim of this study was to spur the lipid accumulation by larvae of Hermetia illucens or black soldier fly (BSFL) via feeding with yeast fermented medium. The Saccharomyces cerevisiae, a single cell yeast, was introduced at different concentrations (0.02, 0.1, 0.5, 1.0, 2.5 wt %) to execute an in-situ fermentation on coconut endosperm waste. The rearing of BSFL was started simultaneously and the rearing was stopped once the BSFL reached the fifth instar. With the increasing of yeast concentration, the rearing duration of BSFL was shortened from 15.5 to 13.5 days. Moreover, it was found that at 0.5 to 1.0 wt % yeast concentration, the lipid yield and lipid productivity of BSFL were statistically enhanced to their highest peaks, namely, at 49.4% and 0.53 g/day, respectively. With regard to biodiesel composition, BSFL-derived biodiesel contained mainly C12:0, C14:0, C16:0 and C18:1. The higher amount of saturated fatty acids could strengthen the oxidative stability biodiesel produced as compared with non-edible oils or microalgal lipid. At last, the addition of yeast was also found to improve the waste reduction index of coconut endosperm waste (CEW) from 0.31 to 0.40 g/day, heralding the capability of BSFL to valorize organic waste via bioconversion into its biomass to serve as a feedstock for biodiesel production.

Original languageBritish English
JournalSustainability (Switzerland)
Volume12
Issue number4
DOIs
StatePublished - 1 Feb 2020

Keywords

  • Biodiesel
  • Black soldier fly
  • Fermentation
  • Lipid
  • Organic waste
  • Yeast

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