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Research article - Peer-reviewed, 2019

Pre-treatment of banana peel to improve composting by black soldier fly (Hermetia illucens (L.), Diptera: Stratiomyidae) larvae

Isibika, A.; Vinneras, B.; Kibazohi, O.; Zurbruegg, C.; Lalander, C.

Abstract

Use of black soldier fly (Hermetia illucens (L), Diptera: Stratiomyidae) larvae (BSFL) is among the solutions being explored to shift the value chain in organic waste management by producing valuable products. Although BSFL consume a range of substrates, nutrient-imbalanced materials with high hemicellulose and lignin content, e.g. manure and banana peel, yield low conversion into larval biomass. This study explored pre-treatment methods to improve the nutrient composition and digestibility of banana peel to achieve higher substrate conversion into BSFL biomass. The pre-treatment methods evaluated were microbial, chemical (non-protein nitrogen), heat-based, and combinations of these. All pre-treatments tested except heating resulted in more efficient BSFL conversion in terms of final larvae weight. The low BSFL responses in pre-treatments were caused by the observed high amounts of tannins and phenolic compounds mainly from the heating pre-treatment. Waste to biomass conversion ratio correlated negatively with substrate volatile solids (VS) and positively with the decrease in VS in pre-treatment. Microbial - 14 days pre-treatments provided the optimum pre-treatment time for the microorganisms to achieve maximum degradation of the substrates, facilitating larval assimilation of the released nutrients. Rhizopus oligosporus-14 days and ammonia + Rhizopus resulted in the most efficient BSFL treatment, measured as protein produced per kg incoming material. (C) 2019 The Author(s). Published by Elsevier Ltd.

Keywords

Food industry waste; Fruit peel; Eco-technologies; Trichoderma reesei; Rhizopus oligosporus; Organic waste management

Published in

Waste Management
2019, Volume: 100, pages: 151-160
Publisher: PERGAMON-ELSEVIER SCIENCE LTD