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Process efficiency in black soldier fly larvae composting of plant-based food industry waste : impact of pre-treatment

Lindberg, Lovisa (2021). Process efficiency in black soldier fly larvae composting of plant-based food industry waste : impact of pre-treatment. Sveriges lantbruksuniv.
ISBN 978-91-576-9896-4
eISBN 978-91-576-9897-1
[Licentiate thesis]

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Abstract

Black soldier fly larvae (BSFL) composting, in which biodegradable wastes are converted into animal-feed protein, is a technology that meets circular economy principles. The greatest potential BSFL composting is for mixed food waste, but only plant-based waste is permitted as feed for the larvae. It has lower biomass conversion efficiency (BCE), but this could be improved by pre-treatment.
This thesis investigated process efficiency and GHG and ammonia emissions from BSFL composting using orange peel and broccoli and cauliflower, with ammonia or fungi pre-treatment. The impact of enzyme and ammonia pre-treatment time on process efficiency when using mixed lettuce and cabbage waste was also assessed. Following two weeks of substrate pre-treatment with ammonia and fungi, direct emissions of GHG and ammonia were evaluated. Lettuce and cabbage was pre-treated with enzymes or ammonia for 0-8 days prior to BSFL composting.
BCE on a volatile solids (VS) basis was greater overall for food waste and lettuce and cabbage (~20%) than for orange peel and broccoli and cauliflower (~7%). The BCE was low (6%) in the orange peel control and even lower in both orange peel pre-treatments. Direct addition of enzymes at the start of BSFL composting gave 22% higher BCE compared with the control.
Total emissions of N2O and CH4 were almost four-fold larger for the broccoli and cauliflower control than when pre-treated, indicating that ammonia pre-treatment significantly reduced total GHG emissions with no negative impact on BCE during BSFL composting, but with increased ammonia emissions.

Authors/Creators:Lindberg, Lovisa
Title:Process efficiency in black soldier fly larvae composting of plant-based food industry waste : impact of pre-treatment
Year of publishing :2021
Number of Pages:67
Publisher:Department of Energy and Technology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-9896-4
ISBN for electronic version:978-91-576-9897-1
Language:English
Publication Type:Licentiate thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Keywords:Biological treatment, plant-based waste, Hermetia illucens, pre-treatment, ammonia, Trichoderma reesei, enzyme
URN:NBN:urn:nbn:se:slu:epsilon-p-113633
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113633
ID Code:25464
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:21 Sep 2021 07:26
Metadata Last Modified:22 Sep 2021 06:27

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