Supplementing wastewater with NPK fertilizer as a cheap source of nutrients in cultivating live food (Chlorella vulgaris)

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dc.contributor.authorMtaki, Kulwa
dc.contributor.authorKyewalyanga, Margareth S.
dc.contributor.authorMtolera, Matern S.P.
dc.date.accessioned2021-03-29T12:47:56Z
dc.date.available2021-03-29T12:47:56Z
dc.date.issued2021
dc.description.abstractIntroduction: The decline in fishery resources from the wild has led to an ever increasing focus on aquaculture in recent years. With increasing aquaculture of animal species, there is an increasing need for suitable microalgae in the production of these animals. However, cultivation of microalgae in expensive pure chemical media is one of the major challenges facing large-scale cultivation of microalgae. Purpose: The present study investigated the suitability of aquaculture wastewater (AWW) supplemented with NPK (nitrogen:phosphorus:potassium) fertilizer as a cheap source of nutrient to cultivate a microalga Chlorella vulgaris (C. vulgaris). Methods: C. vulgaris with an initial cell density of 0.8 × 106 cells/mL was batch cultured in AWW supplemented with NPK at 0.1, 0.5, 1.0 g/L and BBM for 20 days under laboratory conditions using 2000 mL Erlenmeyer flasks. The proximate composition, chlorophyll, minerals, and vitamins analysis of C. vulgaris biomass were done using standard analytical methods. Results: The highest values in optical density (4.872 ± 0.025), dry cell weight (2.858 ± 0.015 g/L), specific growth rate (0.2097 ± 0.0038 day–1), and biomass productivity (0.1701 ± 0.0007 g/L/day) were obtained in C. vulgaris grown in AWW + 1.0 NPK medium. The total chlorophyll, protein, lipid, and carbohydrate content of the microalgae biomass were in the range of 0.05–0.862%, 44.062–57.089%, 17.064–23.260%, and 15.217–21.896%, respectively. Furthermore, microalgae grown in AWW + 1.0 NPK showed good vitamin and mineral content compared to BBM grown alga. Conclusion: These findings indicated that the AWW + 0.1 NPK, AWW + 0.5 NPK, and AWW + 1.0 NPK are potential growth media for C. vulgaris cultivation and can replace the BBM medium, which is very expensive and less accessible to users.en_US
dc.description.sponsorshipSida Sweden through the Marine Science Bilateral Programmeen_US
dc.identifier.citationMtaki, K., Kyewalyanga, M.S. and Mtolera, M.S.P. (2021). Supplementing wastewater with NPK fertilizer as a cheap source of nutrients in cultivating live food (Chlorella vulgaris). Ann Microbiol 71, 7.en_US
dc.identifier.doihttps://doi.org/10.1186/s13213-020-01618-0
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5560
dc.language.isoenen_US
dc.publisherSPRINGER NATUREen_US
dc.subjectChlorella vulgaris, Microalgae, Aquaculture wastewater, NPKen_US
dc.titleSupplementing wastewater with NPK fertilizer as a cheap source of nutrients in cultivating live food (Chlorella vulgaris)en_US
dc.typeJournal Articleen_US
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