Journal
BIORESOURCE TECHNOLOGY
Volume 340, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125637
Keywords
Bioeconomy; Food waste; LCA; Nutrient recovery; Proteins
Funding
- German Federal Ministry of Education and Research (BMBF) [031B0934A, 031B0934B]
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The study aimed to evaluate the global warming potential and resource efficiency of producing 1 kg dry algal biomass powder, finding that using hydrolyzed food waste resulted in a carbon footprint 11% higher than using conventional glucose.
The aim of this study was to perform a Life Cycle Assessment of a production process of 1 kg dry algal biomass powder (Galdieria sulphuraria) with 27 % (w/w) protein content for human consumption for optimizing the production regarding global warming potential and resource efficiency in combination with food waste utilization. It was investigated, underpinned by a comparison of the use of conventional glucose, whether and to what extent the environmental impact/global warming potential can be reduced by changing to food waste hydrolysate and how this can lead to a more sustainable use of resources and a sustainable development. Overall, the results showed that hydrolysis, along with freeze-drying, caused most of the overall impact. The carbon footprint associated with the use of hydrolyzed food waste was 11% higher than using conventional glucose and supplementary nutrients mainly driven by the high demand of energy for hydrolysis.
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