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Low-cost technology for recycling agro-industrial waste into nutrient-rich organic fertilizer using black soldier fly
Open accessAbstract
Efforts to recycle organic waste using black soldier fly (BSF) larvae into high-quality alternative protein ingredients in animal feeds and organic fertilizers have gained momentum worldwide. However, there is limited information on waste manipulation to increase nutrient retention for enhanced larval performance and frass fertilizer quality. In the present study, brewer's spent grain with a carbon to nitrogen (C/N) ratio of 11 (control) was amended with sawdust to obtain substrates with C/N ratios of 15, 20, 25 and 30. The effects of substrate C/N ratios on BSF larval yield, waste degradation, biomass conversion efficiency, compost maturity and nutrient levels of frass fertilizer were evaluated. Substrates amended with sawdust did not significantly affect waste degradation efficiency and biomass conversion rates of BSF larvae. The wet and dried larval yields were significantly higher for substrates with C/N ratio of 15 compared to the other amended substrates. An amended substrate with C/N ratio of 15 enhanced nutrients uptake by BSF larvae, and increased nitrogen (N) and phosphorus retention in frass compost by 21 and 15%, respectively. Compost maturation time was shortened to five weeks, as indicated by the stable C/N ratios and high seed germination indices. This study has demonstrated that the amendment of the substrate with sawdust to C/N ratio of 15 could generate compost with desirable nutrients for use as high-quality fertilizer for organic farming.
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Maize planted on BSFL frass fertilizer-treated plots had net revenue 29-44% more than maize grown on commercial organic fertilizer-treated plots.
“Maize planted on BSFL frass fertilizer-treated plots had a net revenue that was 29–44% more than maize grown on commercial organic fertilizer-treated plots.”
From Potential Applications of Frass Derived from Black Soldier Fly Larvae Treatment of Food Waste: A Review (2022) · cites this paper as [54]
Smallholder insect farmers who use BSFL frass fertiliser directly for maize growing generate 30-232% more net revenue than farmers who buy identical BSFL frass fertiliser.
“Furthermore, smallholder insect farmers who use BSFL frass fertiliser directly for maize growing will generate 30–232% more net revenue than farmers who buy identical BSFL frass fertiliser.”
From Potential Applications of Frass Derived from Black Soldier Fly Larvae Treatment of Food Waste: A Review (2022) · cites this paper as [54]
Employing BSFL frass fertiliser boosts farmers' net revenue by 5-15 times compared to BSF farming alone.
“According to a study conducted by Beesigamukama et al. [54], employing BSFL frass fertiliser has boosted farmers’ net revenue by 5–15 times compared to BSF farming alone.”
From Potential Applications of Frass Derived from Black Soldier Fly Larvae Treatment of Food Waste: A Review (2022) · cites this paper as [54]
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Sorted by citations
Basri, N. E. A., Azman, N. A., Ahmad, I. K., Suja, F., Jalil, N. A. A., & Amrul, N. F. (2022) · Foods · doi:10.3390/foods11172664 · Cited by 119
Fischer, H., Romano, N., & Sinha, A. K. (2021) · Insects · doi:10.3390/insects12040332 · Cited by 59
Metadata
- Authors
- Beesigamukama, D., Mochoge, B., Korir, N. K., K.M. Fiaboe, K., Nakimbugwe, D., Khamis, F. M., Subramanian, S., Wangu, M. M., Dubois, T., Ekesi, S., & Tanga, C. M.
- Affiliations
- Kenyatta University (KE)
- Makerere University (UG)
- International Centre of Insect Physiology and Ecology (KE)
- Corresponding author
- Beesigamukama, Dennis
- Tanga, Chrysantus M.
- ORCID
- Venue
- Waste Management
- Publisher
- Elsevier BV
- Published
- 2021-01
- Volume
- 119
- Pages
- 183-194
- ISSN
- 0956-053X (ISSN-L)
- OpenAlex
- W3092830988
- Cited by
- 175
- References
- 1
- Citations by year
- 2026: 25 · 2025: 43 · 2024: 40 · 2023: 27 · 2022: 29 · 2021: 11
- FWCI
- 11.74
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Waste Management (publishedVersion, cc-by)
- PubMed (publishedVersion)
- CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) (submittedVersion, cc-by)
- Greater South Information System
- Funders
- Deutscher Akademischer Austauschdienst
- Topics
- Life Sciences › Agricultural and Biological Sciences › Insect Science › Insect Utilization and Effects
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Composting and Vermicomposting Techniques
- Life Sciences › Agricultural and Biological Sciences › Insect Science › Forensic Entomology and Diptera Studies
- Keywords
- Hermetia illucens, brewer's spent grain, sawdust amendment, C/N ratio, substrate composition, larval yield, nutrient retention, compost maturation, waste recycling, organic fertilizer, agro-industrial waste, alternative protein feed
- MeSH terms
- Nutrients, Animals, Fertilizers, Industrial Waste, Larva, Simuliidae, Technology
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