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    Low-cost technology for recycling agro-industrial waste into nutrient-rich organic fertilizer using black soldier fly

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    Journal Article (1.327Mb)
    Date
    2021-01
    Author
    Beesigamukama, D.
    Mochoge, B.
    Korir, N.K.
    Fiaboe, K.K.
    Nakimbugwe, D.
    Khamis, F.M.
    Subramanian, S.
    Wangu, M.M.
    Dubois, T.
    Ekesi, S.
    Tanga, C.M.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    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.
    https://dx.doi.org/10.1016/j.wasman.2020.09.043
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7040
    IITA Authors ORCID
    Komi Fiaboehttps://orcid.org/0000-0001-5113-2159
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1016/j.wasman.2020.09.043
    Research Themes
    Natural Resource Management
    IITA Subjects
    Agronomy; Farm Management; Integrated Soil Fertility Management; Natural Resource Management
    Agrovoc Terms
    Hermetia Illucens; Composting; Nutrients; Soil Parent Material; Wastes; Fertilizers; Recycled Materials; Black Soldier Fly; Organic Wastes
    Regions
    Africa; East Africa
    Countries
    Kenya
    Hubs
    Central Africa Hub
    Journals
    Waste Management
    Collections
    • Journal and Journal Articles4835
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