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Process efficiency and ventilation requirement in black soldier fly larvae composting of substrates with high water content

Lalander, Cecilia and Ermolaev, Evgheni and Wiklicky, Viktoria and Vinnerås, Björn (2020). Process efficiency and ventilation requirement in black soldier fly larvae composting of substrates with high water content. Science of the Total Environment. 729 , 138968
[Research article]

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Abstract

In order to transition from a linear to a circular economy in the organic waste management sector, more of the elements in waste need to be recycled. Use of black soldier fly (Hermetia illucens L.; Diptera: Stratiomyidae) larvae (BSFL) for organic waste treatment has potential to harvest more complex molecules than conventional methods. Many organic waste substrates have high water content (>80%), but the impact on BSFL treatment efficiency of substrate water contents >80% is not known. This study evaluated the impact of high water content food waste on BSFL composting efficiency in terms of waste-to-biomass conversion ratio, material reduction, larval survival and the ventilation required for enabling dry separation of larvae from residue. In total, six water contents ranging from 76% to 97.5% were evaluated in two experimental trials. It was found that increasing water content reduced biomass conversion ratio and survival rate of the larvae, from 33.4% of volatile solids (VS) and 97.2% survival in 76% water to 17.5% of VS and 19.3% survival in 97.5% water. Furthermore, we found that the ventilation requirement for achieving dry separation of larvae from residue could be modelled by estimating the amount of water that would need to be removed, taking into account the water bound in the larvae, and knowing the specifics of the ventilation set-up of the modelled system. The findings could have implications on the waste management sector interested in implementing BSFL treatment, as the findings demonstrate that it is possible to treat wet substrates (such as fruit and vegetable wastes) without any pre-treatment other than grinding and attain an adequately dry residue for enabling dry separation of the larvae from the residue. (C) 2020 The Authors. Published by Elsevier B.V.

Authors/Creators:Lalander, Cecilia and Ermolaev, Evgheni and Wiklicky, Viktoria and Vinnerås, Björn
Title:Process efficiency and ventilation requirement in black soldier fly larvae composting of substrates with high water content
Series Name/Journal:Science of the Total Environment
Year of publishing :2020
Volume:729
Article number:138968
Number of Pages:8
Publisher:ELSEVIER
ISSN:0048-9697
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 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Animal feed, Biodegradable waste, Circular economy, Eco-technologies, Hermetia illucens, Nutrient recycling
URN:NBN:urn:nbn:se:slu:epsilon-p-108296
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108296
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2020.138968
Web of Science (WoS)000576481200005
ID Code:18734
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:25 Nov 2020 09:23
Metadata Last Modified:15 Jan 2021 19:25

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