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Process efficiency in relation to enzyme pre-treatment duration in black soldier fly larvae composting

Lindberg, Lovisa and Vinnerås, Björn and Lalander, Cecilia (2022). Process efficiency in relation to enzyme pre-treatment duration in black soldier fly larvae composting. Waste Management. 137 , 121-127
[Research article]

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Abstract

Black soldier fly larvae (BSFL) composting is a treatment in which biodegradable food waste is converted into animal-feed protein and organic fertiliser. BSFL composting has greatest potential for mixed food waste, but under European Union regulations only plant-based waste is permitted as feed for larvae. Biomass conversion efficiency (BCE) in BSFL composting is lower for plant-based waste than for mixed food waste. One way of improving BCE for plant-based waste is to add enzymes to make the waste more available to the larvae, but enzyme pre-treatment is not commonly applied prior to BSFL composting. Therefore this study examined the impact of enzyme pre-treatment duration on process efficiency in BSFL composting of lettuce-cabbage waste pretreated with enzymes for 0-4 days. The results showed that total solids (TS) in larvae decreased with longer enzyme pre-treatment. Direct addition of enzymes at the start of BSFL treatment (0 day pre-treatment) resulted in 22% higher BCE on a volatile solids (VS) basis compared with the control, while longer pre-treatment did not improve BCE further. Much of the VS was respired in the 0-day pre-treatment, resulting in lower mass of residues at the end of treatment. Longer pre-treatment increased microbial respiration, suggesting that the microbial community consumed more easily available carbohydrates during the pre-treatment step, which counteracted the purpose of enzyme pre-treatment, i.e. increasing BCE during BSFL composting.

Authors/Creators:Lindberg, Lovisa and Vinnerås, Björn and Lalander, Cecilia
Title:Process efficiency in relation to enzyme pre-treatment duration in black soldier fly larvae composting
Series Name/Journal:Waste Management
Year of publishing :2022
Volume:137
Page range:121-127
Number of Pages:7
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0956-053X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 209 Industrial Biotechnology > Biocatalysis and Enzyme Technology
Keywords:Biological treatment, Plant-based waste, Hermetia illucens, Pre-treatment, Enzyme hydrolysis
URN:NBN:urn:nbn:se:slu:epsilon-p-116307
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116307
Additional ID:
Type of IDID
DOI10.1016/j.wasman.2021.10.033
Web of Science (WoS)000746547900009
ID Code:27319
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:15 Mar 2022 13:25
Metadata Last Modified:16 May 2022 20:30

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