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Black Soldier Fly Larvae Treatment

Enlarged view: Black soldier fly larvae treatment
Schematic summary of important processes in BSFL treatment, developed based on well-studied fly larvae. (a) BSFL treatment conceptually divided into a larva and biowaste reactor. (b) The larva midgut is most important for nutrient sensing, decomposition and absorption. The midgut is compartmentalised longitudinally considering pH and enzymes , and lined by the peritrophic matrix for the different phases of enzymatic hydrolysis of diet constituents. Size of macronutrients is reduced along the midgut, with nutrient absorption mostly taking place in the posterior midgut. Some enzymes appear to be returned by water fluxes. The fat body signals larva development in the presence of amino acids via the IIS/TOR pathway. (c) Enzymatic and microbial decomposition of biowaste macronutrients in the biowaste reactor. Adapted from: Beskin et al., 2018; De Smet et al., 2018; Espinoza-Fuentes and Terra, 1987; Lee and Brey, 2013; Lemaitre and Miguel-Aliaga, 2013; Wong et al., 2016. (Gold M., Tomberlin J.K., Diener S., Zurbrügg C. and Mathys A. 2018)
Enlarged view: Bio waste formulation and BSF performance results
Effects of the different individual wastes on waste reduction (top, left), bioconversion rate (top, right), waste conversion efficiency (bottom, left) and protein conversion efficiency (bottom, right) in comparison to the benchmark poultry feed (dashed vertical line). Means, standard deviations and results per replicate are displayed. Performance results with no shared letter are significantly different from each other. All results are given in dry mass. (Gold M., Cassar, C.M., Zurbrugg,C., Kreuzer M., Boulos S.,  Diener S.,  Mathys A. 2020)
Enlarged view: RTD BSFL
Probability density functions of the BSFL midgut residence time for the three artificial diets. AMG: Anterior midgut, MMG: Middle midgut, PMG: Posterior midgut. Gold M., Egger J., Scheidegger A., Zurbrugg C., Bruno D., Bonelli M., Tettamanti G., Casartelli M., Schmitt E., Kerkaert B., De Smet J., van Campenhout L., Mathys A. (2020)
Enlarged view: Dani Review Fig 1
Schematic of the BSFL process for the production of insect-based feed, bioenergy, and fertilizer from agri-food wastes and byproducts. (B) Schematic of the structural change of lignocellulosic components after physical, chemical, and biological pretreatments as part of substrate preparation. Underlined pretreatments are reviewed in this study. Adapted from Mosier et al. (2005) and Dortmans et al. (2021). Peguero, Gold, Vandeweyer, Zurbrügg and Mathys (2022)

Summary

Processing of biowaste with larvae of the black soldier fly, Hermetia illucens L. (Diptera: Stratiomyidae), is an emerging waste treatment technology. Larvae grown on biowaste can be a relevant raw material for animal feed production and can therefore provide revenues for financially viable waste management systems. In addition, when produced on biowaste, insect-based feeds can be more sustainable than conventional feeds. Among others, the scalability of the technology will depend on the availability of large amounts of biowaste with a high process performance (e.g. bioconversion of organic matter to proteins and lipids) and microbial and chemical product safety. Currently, in contrast to other waste treatment technologies, such as composting or anaerobic digestion, the process performance is variable and the processes driving the decomposition of biowaste macronutrients, inactivation of microbes and fate of chemicals is poorly understood. This work presents a summary of the most important processes involved in black soldier fly larvae (BSFL) treatment, based on the available knowledge concerning five well-studied fly species. This is a starting point to increase understanding regarding the processes of this technology, with the potential to increase its efficiency and uptake, and support the development of appropriate regulations. Based on this work, formulating different types of biowaste, e.g. to produce a diet with a similar protein content, a balanced amino acid profile and/or pre- and co-treatment of biowaste with beneficial microbes, has the potential to increase process performance. Following harvest, larvae require heat or other treatments for microbial inactivation and safety.

National University of Singapore (NUS) and Singapore-ETH Centre (SEC) coordinated black soldier fly larvae project, 2022-2024

This project, led by the National University of Singapore (NUS) and the Singapore-ETH Centre (SEC), in collaboration with ETH Zurich and the Nanyang Technological University Singapore (NTU Singapore), aims to develop a blueprint to integrate food waste management and sustainable food production in urban settings like Singapore using black soldier fly larvae.

external pagehttps://news.nus.edu.sg/interdisciplinary-team-to-develop-blueprint-for-sustainable-urban-food-waste-management-and-food-systems-using-black-soldier-flies/

Selected publications of ETH Zurich SFP Team

Gold M., Tomberlin J.K., Diener S., Zurbrügg C. and Mathys A. (2018). Decomposition of biowaste macronutrients, microbes, and chemicals in black soldier fly larval treatment: A review. Waste Management, 82, 302-318. external pageDOI

Peguero D.A., Gold M., Vandeweyer D., Zurbrügg C. and Mathys A. (2022). A Review of Pretreatment Methods to Improve Agri-​Food Waste Bioconversion by Black Soldier Fly Larvae. Frontiers in Sustainable Food Systems, vol. 5, pp. 745894, external pageDOI

Heuel, M., Sandrock, C., Leiber, F., Mathys, A., Gold, M., Zurbrügg, C., Gangnat, I., Kreuzer, M. & Terranova, M. (2021). Black Soldier Fly larvae meal and fat can completely replace soybean cake and oil in diets for laying hens. Poultry Science, external pageDOI

Gold M., Fowles T., Fernandez-​Bayo J.D., Palma Miner L., Zurbrügg C., Nansen C., Bischel H.N. and Mathys A. (2021). Effects of rearing system and microbial inoculation on black soldier fly larvae growth and microbiota when reared on agri-​food by-​products. Journal of Insects as Food and Feed, vol. 8: no. 2, pp. 113-​127. external pageDOI

Gold M., von Allmen, F., Zurbrügg,C., Zhang, J., Mathys A. (2020). Identification of Bacteria in Two Food Waste Black Soldier Fly Larvae Rearing Residues. Frontiers in Microbiology, 11:582867. external pageDOI

Gold, M., Binggeli, M., Kurt, F., de Wouters, T., Reichlin, M., Zurbrügg, C., Mathys, A. & Kreuzer, M. (2020). Novel Experimental Methods for the Investigation of Hermetia illucens (Diptera: Stratiomyidae) Larvae. Journal of Insect Science, 20: 21. external pageDOI

Gold M., Cassar, C.M., Zurbrugg,C., Kreuzer M., Boulos S.,  Diener S.,  Mathys A. (2020). Biowaste treatment with black soldier fly larvae: increasing performance through the formulation of biowastes based on protein and carbohydrates. Waste Management: 102, 319–329. external pageDOI

Gold M., Egger J., Scheidegger A., Zurbrugg C., Bruno D., Bonelli M., Tettamanti G., Casartelli M., Schmitt E., Kerkaert B., De Smet J., van Campenhout L., Mathys A. (2020). Estimating black soldier fly larvae biowaste conversion performance by simulation of midgut digestion. Waste Management, 112, 40-51. external pageDOI

Smetana S., Schmitt, E. & Mathys A. (2019). Sustainable use of Hermetia illucens insect biomass for feed and food: attributional and consequential Life Cycle Assessment. Resources, Conservation & Recycling, 144, 285-296. external pageDOI

Somroo A., Rehman K., Zheng L, Cai M., Xiao X., Hu S., Mathys A., Gold M., Yu Z., & Zhang J.  (2019). Influence of Lactobacillus buchneri on soybean curd residue coconversion by black soldier fly larvae (Hermetia illucens) for food and feedstock production. Waste Management, 86, 114-122. external pageDOI

Aarts K.W.P., Jansen, M.P.M. Jacobs,A.L.M., Mescher M.C., Prenter R., Mathys A. & De Moraes C.M.  (2018). Processing of insect larvae. EU patent application. Application No 18175914.3-110

Smetana S., Palanisamy M., Mathys A., & Heinz V. (2016). Sustainability of insect use for feed and food: Life Cycle Assessment perspective. Journal of Cleaner Production, 137, 741-751. external pageDOI

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