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Dortmans, Bram, 2015. Valorisation of organic waste : effect of the feeding regime on process parameters in a continuous black soldier fly larvae composting system. Second cycle, A2E. Uppsala: SLU, Dept. of Energy and Technology



Municipal solid waste- and especially organic solid waste management has be- come a major challenge in both developing and developed countries and is often related to the spread of diseases. At the same time, an increase in the demand for animal feed protein causes disturbances in (marine) ecosystems and nutrient recy- cling in soils is unsatisfactory in many places. These issues have a major negative impact on the environment. Black soldier fly composting could solve these prob- lems; by using the larvae of the black soldier fly (Hermetia illucens) to process organic waste and produce two valuable products: black soldier fly larvae, which could be used as chicken and fish feed, and the residue that can function as an or- ganic fertiliser.
The aim of this study was to identify specific process parameters leading to op- timised performance of a continuous black soldier fly composting system. This was accomplished by measuring specific parameters (pH, compost maturity, total solids, organic content) on various points along two plug flow reactors operated with dif- ferent larval feeding regimes (40 mg dry food/larva/day and 60 mg dry food/larva/day) and identifying differences between the two regimes.
The pH, compost maturity, total solids, organic content, prepupal weight, mate- rial reduction and biomass conversion rate did not differ significantly (P<0.05) between the two feeding regimes. However, survival rate of the larvae was significantly higher (100%) when fed with 60 mg total solids food/larva/day in comparison to when following the feeding regime with 40 mg total solids food/larva/day (70%). A material reduction of 68% (85% on wet basis) and a waste- to-biomass conversion rate of 19% on a total solids basis was achieved in the system.
It was found that black soldier fly composting can process more waste than what was expected per larva and day. However, further studies are needed in order to increase the total amount of waste treated in the unit.

Main title:Valorisation of organic waste
Subtitle:effect of the feeding regime on process parameters in a continuous black soldier fly larvae composting system
Authors:Dortmans, Bram
Supervisor:Diener, Stefan and Lalander, Cecilia
Examiner:Vinnerås, Björn
Series:Examensarbete / Institutionen för energi och teknik, SLU
Volume/Sequential designation:2015:06
Year of Publication:2015
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM011 Sustainable Development - Master's Programme 120 HEC
Supervising department:(NL, NJ) > Dept. of Energy and Technology
Keywords:organic waste management, animal feed, waste-to-biomass conversion rate, larval survival rate, waste reduction & compost maturity
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Animal physiology - Growth and development
Processing of agricultural wastes
Deposited On:07 Sep 2015 15:02
Metadata Last Modified:07 Sep 2015 15:02

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