The visit was a great opportunity to show the group´s strong competences and relevance in regards of circular economy (wastemanagement and feed production). After a quick visit, the group hurried on to visit other research groups and get an insight to the wide and important research conducted at SLU.
The Kjell and Märta Beijer Foundation was founded in 1974 through a donation from Kjell and Märta Beijer. In addition to scientific research and education, the foundation supports culture, above all in connection with Swedish design and home furnishing tradition. Among other things, the foundation is behind the Beijer Institute, one of the world’s leading research centers in ecological economics. It had been a great day and Cecilia received a lot of interesting questions and also witnessed some of the visitors testing our dried larvae first hand!
From February to May 2021, the project “5 ton grön fisk i disk” (partly financed by Vinnova) produced 1,7 tons of larvae on a mix of 10 tonnes vegetable and bread waste. The vegetables were discarded vegetable cuttings from
Sorunda Grönsakshallen and the bread was out-of-date Fazer bread from local supermarkets. The larv ae were not only produced at SLU campus but they were also further processed here: after drying at 60°C for 48 h, the dry larva were pressed in a screw press to separate the protein from the fat. The defatted protein meal was then turned into fish feed, containing many other locally sourced ingredients, for rainbow trout. The trout were grown by Älvdalslax in Dalarna.
The residue from the treatment, the frass, was used as soil amendment on the nearby student run permaculture garden. Dagens nyheter found out about this cool project and came to visit us. Jessica Ritzen followed Cecilia Lalander and Anders Kiessling through the different stages of the protein production for the 5 ton fish on the counter project. Read the full article here.
Cecilia Lalander from the Department of Energy and Technology and Anders Kiessling from the Department of Animal Nutrition and Management are part of a project with partners from all over Sweden who have just been granted SEK 3.8 million from FORMAS for a pilot project in which artificial intelligence (AI) will support the development of a sustainable urban food production system.
Northern Sweden has recently attracted large industries and server halls as well as the next generation fossil-free steel industry (H2GreenSteel), due to its easy access to renewable energy and natural resources, as well as a cool climate. Boden municipality aims to be Europe’s most resource-efficient and carbon-neutral municipality by 2025. In fact, since 2020, Boden has initiated a large-scale symbiosis project called the Boden Energy Symbiosis, part of the Boden Business Park. In fact, since 2020 Boden has initiated a large-scale symbiosis project called the Boden Symbiosis Cluster, part of the Boden Business Park. One of the initiatives aim at creating an urban food competence platform of commercial size to be used as a national asset for implementing and testing innovative solutions for food production systems.
Check out our latest publication in Waste Management Process efficiency in relation to enzyme pre-treatment duration in black soldier fly larvae composting. We investigated the impact of enzyme pre-treatment time duration on the efficiency, in terms of biomass conversion efficiency and material reduction, in black soldier fly larvae (BSFL) composting of lettuce and cabbage (vegetable cuttings from Grönsakshallen Sorunda). We found that direct addition of enzyme (i.e. no pre-treatment time, but adding the enzymes as the same time as the larvae) was the only treatment that significantly improved process efficiency.
This study aimed to enhance the biodegradable solid waste management of low-quality food and agro-industrial waste streams, in terms of BSFL process performance efficiencies by means of co-composting. A fibre-rich, hard to degrade waste stream such as fruit peels by BSFL, was co-composted with a low-quality protein-rich waste stream (fish waste). Results show that co-composting has the ability to increase the BSFL composting efficiencies from nutrient-imbalanced substrates such those used in this study. Protein content increased as more fish waste was added into the substrate mixtures. Biomass conversion rate was generally increased by the addition of fish waste in the substrate mixtures and the highest conversion and BSFL weight achieved was 25 % and 269 mg larva-1, respectively, with 75 % fish waste (12 % protein addition) inclusion. However, BSFL treatment efficiency parameters showed wide variation with inclusion of 75 % fish waste in the substrate, possibly owing to differences in nutritional composition (especially fat content) of different fish waste batches. Lower variations in process efficiency renders higher reliability of the treatment process. Therefore, 25 % inclusion of fish waste (4 % protein addition) was concluded to be beneficial and sufficient enough to improve the overall BSFL process efficiency.
Isibika A., Vinnerås B., Kibazohi O., Zurbrügg C. & Lalander C. (2021) Co-composting of banana peel and orange peel waste with fish waste to improve conversion by black soldier fly (Hermetia illucens (L.), Diptera: Stratiomyidae) larvae. Journal of Cleaner Production 318, 128570
As BSF has become mainstream as an exciting way to treat organic waste, we receive more and more inquiries with questions on “what shall I” and “how shall I”. Academic journal articles seldom give enough easily digestible answers for practitioners, interested in starting or already operating a BSF facility.
For this purpose a practical knowledge hub webpage has been established which contains information all around BSF waste processing in a hopefully easy and practical format for people “in the field”.
Containing substantial amounts of plant nutrients, black soldier fly larvae frass or “BSF residue”, is a promising soil amendment that gains more and more interest with increasing BSF farming around the globe. In the last years, the residue at our BSF colony, accumulating from various chicken and fish feed experiments, was an overlooked ”by-product”. Most of the residue ended up in our own garden plots or worse, was sent off for incineration. As the 2021 garden-season kicked off, the BSF group teamed up with Ultuna Permaculture to put 500 kg of BSF residue to good use! Last month, the garlics received their first load of extra nutrients and once the weather starts to warm up, the potatoes are next. Our vision is to create a closed loop system in which we feed our fly larvae with locally sourced waste (such as bread or vegetable waste from nearby factories), generate protein in form of larval biomass and put the residue from the process back into the food chain.
Friday afternoon, the 23rd of April, Lovisa Lindberg was standing in her office and held a presentation about larvae as a substitute for fish feed for high school students from Värmdö municipality. This was a part of BSSC’s (Baltic Sea Science Center) theme week at Skansen where they invited different experts to talk about their science projects related to the Baltic Sea. Classes from grade 9 up to grade 12 booked the lectures they wanted to attend to during this week. In addition to the lectures, they were sent material in advance to read or watch such as popular summaries about the topic or if there were any videos available. After the lecture, the work continued with a scientific paper related to the topic and the goal was for them to get an understanding of how a scientific paper is written.