Tag Archives: Organic waste

BSF larvae as chicken feed

This summer the BSF farm supplied 40 laying hens with 25kg of live larva per week. The experiment stretched over 14 weeks and in the end a grand total of 350kg of live larva ended up as nutritious chicken feed! The hens were split up into three experimental groups, in addition to a control group, each group following a different diet: A standard chicken feed with a substitution of 10%, 20% and ad libitum larvae was provided to evaluate the impact on the hens. They were monitored on a regular basis with weekly measurements of hen body weight, egg production, and feed consumption. The amount of larvae consumed was measured daily and egg quality and behavior data were also collected. The researchers will use the results of this study to select the diet that includes the highest substitution of protein from soy to BSF larvae while still maintaining appropriate egg production and hen welfare.

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Reduction of bacteria in relation to feeding regimes when treating aquaculture waste in fly larvae composting

The partnership between the Environmental Engineering Group at SLU and Dr. Ivã Guidini Lopes from the Aquaculture Center of Unesp (São Paulo, Brazil) resulted in a second publication, entitled “Reduction of bacteria in relation to feeding regimes when treating aquaculture waste in fly larvae composting”, recently published in Frontiers in Microbiology, as part of the research topic “Microbial dynamics during industrial rearing and processing of insects”.

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David Jonsson presenta su tesis sobre biopolímero proveniente de proteínas de insecto

David Jonsson ha estado trabajando en el desarrollo de un biopolímero a partir de la proteína de larvas BSF (larva de mosca soldado negra) y ahora ha concluido su trabajo. Asista a la presentación de su tesis de maestría en biotecnología para obtener más información.

Fotos: David Jönsson
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Eficiencia del proceso y requerimiento de ventilación en compostaje BSFL (larvas de mosca soldado negra) de sustratos con alto contenido de humedad

Nuestra última publicación sobre compostaje BSFL titulada Eficiencia del proceso y requerimiento de ventilación en compostaje de sustratos con alto contenido de agua mediante larvas de mosca soldado negra se ha publicado recientemente en Science of the Total Environment. En este estudio investigamos el impacto de altos contenidos de humedad en el sustrato sobre la eficiencia del compostaje de larvas de mosca soldado negro. La ventilación requerida para lograr un residuo suficientemente seco como para facilitar la separación de las larvas del residuo compostado fue modelada. En contraste con lo que otros estudios han encontrado, determinamos que es posible compostar sustratos con un contenido de agua del 80 al 90% con BSFL y separar en seco las larvas del residuo. La eficiencia del proceso disminuyó considerablemente mientras que el requerimiento de ventilación aumentó para sustratos con contenido de agua> 90%.

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Process efficiency and ventilation requirement in BSFL composting of substrates with high water content

Our latest publication on BSFL composting entitled Process efficiency and ventilation requirement in black soldier fly larvae composting of substrates with high water content has been recently published in Science of the Total Environment. In this study we investigated the impact on increasing substrate water content on the process efficiency in black soldier fly larvae composting. We used the gathered data to make a model predicting the required ventilation for achieving a residue dry enough to allow for dry separation of larvae from treatment residue at the end of the composting. In contrast to what other studies have found, we fund that it is possible to BSFL compost substrates with water content 80 – 90 % and dry separate the larvae from the residue. For substrates with water content >90% it was more difficult, as the process efficiency decreased greatly, while the ventilation requirement increased.

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Presentation for 10th grade students about fly larvae composting

Lovisa explains the waste hierarchy. Photo: Pernilla Bjerling

ProCivitas private school for grade 10-12 is a small school with students in the science program and the social science program. The school provide the students with lectures about research once every month, called the lecture of the month, with different themes. This month, the theme was sustainable systems and Lovisa Lindberg from the group went there to talk about fly larvae composting but also Maria Westerholm from a different department at SLU went there to talk about biogas research.

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Live streaming of fly larvae composting project at Hedda Wising School

Fly larvae composting has sparked interest in 8th grade students from Hedda Wising school, who wanted to test fly larvae composting on their own.

The aim of the project is to evaluate how simple the system can be and how fast the process goes. The students are driving this experiment with aim to produce feed protein that can be used for chicken or fish production. The substrate is the canteen leftovers that would otherwise become food waste. The project at the school is a part of an EU collaboration project ”Envising” with focus on sustainability.

Follow the link to check out the larvae:

https://www.youtube.com/channel/UCT00Ppow_EYo_52IDHq59Bg

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