Upcycling food waste as a low‐cost cultivation medium for Chlorella sp. microalgae

Sep 25, 2024Journal of the science of food and agriculture

Using food waste as a cheap growth medium for Chlorella microalgae

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Abstract

The highest biomass concentration of Chlorella vulgaris FSP-E reached 4.465 g/L when cultivated in a 100% food waste culture medium.

Chlorella sp. strains showed varying biomass concentrations when grown in a 10% food waste culture medium, with the highest at 2.869 g/L.
The biochemical composition of C. vulgaris FSP-E cultivated in 100% food waste included lipids at 6.94 mg/g, carbohydrates at 248.24 mg/g, and proteins at 406.23 mg/g.
Using food waste as a culture medium may enhance biomass productivity and biochemical content in microalgae cultivation.
The findings suggest potential contributions to reducing environmental impacts associated with food waste and promoting a circular bioeconomy.

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BACKGROUND: Global food loss and waste have raised environmental concerns regarding the generation of greenhouse gases (e.g., carbon dioxide and methane gas), which directly contribute to climate change. To address these concerns, the present research aims to upcycle food waste into an alternative culture medium for the cultivation of microalgae. Various parameters including pretreatment of food waste (i.e., autoclave and non-autoclave), concentration of food waste culture medium (i.e., 10%, 30%, 50%, 70%, 90% and 100%), harvesting efficiency and biochemical compounds of Chlorella sp. microalgae were carried out.

RESULTS: Based on the preliminary findings, the highest biomass concentration obtained from 10% food waste culture medium in the autoclave for Chlorella sp., including strains FSP-E, ESP-31 and CY-1, were 2.869 ± 0.022, 2.385 ± 0.018 and 0.985 ± 0.0026 g L, respectively. Since Chlorella vulgaris FSP-E exhibited the highest biomass concentration, this microalgal strain was selected to examine the subsequent parameters. Cultivation of C. vulgaris FSP-E in 100FW achieves a biomass concentration of 4.465 ± 0.008 g Lwith biochemical compounds of 6.94 ± 1.396, 248.24 ± 0.976 and 406.23 ± 0.593 mg gfor lipids, carbohydrates and proteins, respectively. -1 -1 -1

CONCLUSION: This study shows that using food waste as an alternative culture medium for C. vulgaris FSP-E can achieve substantial biomass productivity and biochemical content. This research work would contribute to the concept of net zero emission and transitioning toward a circular bioeconomy by upcycling food waste as an alternative culture medium for the cultivation of microalgae. © 2024 Society of Chemical Industry.

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Upcycling food waste as a low‐cost cultivation medium for Chlorella sp. microalgae

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