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Doctoral thesis, 2022

Use of pre-treatments and substrate blending to enhance process efficiency in black soldier fly larvae composting of food industry waste

Isibika, Alice;

Abstract

Black soldier fly larvae (BSFL) composting is a biowaste treatment that converts biomass into valuable animal protein and fertiliser, but low protein content and complex molecules (e.g. fibre) in substrate reduce BSFL composting efficiency. This thesis evaluated the impact of using pre-treatments and blending substrates on BSFL process efficiency. The feasibility of using BSFL composting to treat available food industry waste streams in Tanzania and physical-chemical characteristics of these wastes were also assessed. 

The pre-treatments tested were biological, chemical, heat-based, biochemical and combinations of these, while blending involved mixing banana and orange peels with fish waste. All pre-treatments except heating and all substrate blends improved BSFL conversion efficiency in composting. The conversion efficiency was reduced by high concentrations of tannins, phenols, carbohydrates, fibre and fat, but increased by high protein and nitrogen concentrations. 

The available food industry waste from single companies in Tanzania, in quantities of ~100,000-1,000,000 kg y-1, was not sufficiently nutritionally balanced as a standalone feedstock for BSFL composting. However, with pre-treatment and substrate blending, BSFL composting could be successfully implemented to valorise biowaste streams in cities in low and middle-income countries such as Tanzania and other similar settings globally.

Keywords

Hermetia; Trichoderma; Rhizopus; bacteria; heat; chemical; enzyme

Published in

Acta Universitatis Agriculturae Sueciae

2022, number: 2022:30
ISBN: 978-91-7760-935-3, eISBN: 978-91-7760-936-0
Publisher: Swedish University of Agricultural Sciences

Authors' information

Swedish University of Agricultural Sciences, Department of Energy and Technology

UKÄ Subject classification

Other Environmental Engineering

URI (permanent link to this page)

https://res.slu.se/id/publ/117110