Introduction to the challenges and chances regarding the utilization of nitrogen-rich by-products and waste streams

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This contribution illustrates the potential of nitrogen-rich by-products and waste streams as sources for proteins and amino acids. Furthermore, applications of recovered nitrogen compounds in food and feed as well as non-food and non-feed products have been illuminated. It has been shown that, for instance, cheese, yoghurt, and whey have essential amino acid content above 40% (w/w) of the total amino acid pool. Pumpkin seed pie, hops and sea buckthorn seeds, although the protein content can be more than 20% (w/w) crude protein in dry matter, show a rather poor essential amino acid profile. It should be admitted here that even streams containing diluted amounts of nitrogen compounds such as wastewater should be used. This, however, may only be economically feasible when prior recovery a concentration step is carried out. To foster the recovery and utilization of nitrogen compounds, this contribution describes the challenges and chances of current approaches.

Original languageEnglish
Article number100813
JournalCurrent Opinion in Green and Sustainable Chemistry
Publication statusPublished - 01.06.2023

Bibliographical note

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Acknowledgments The authors acknowledge the German Federal Ministry of Education and Research (BMBF) for providing funding within the Era-Net Cofund “FACCE SURPLUS” (Project UpWaste 031B0934) and German Federal Ministry of Food and Agriculture for providing funding within the Era-Net Cofund “FOSC-ERA” (Project Climaqua 2821ERA12) Programs.

Publisher Copyright:
© 2023 Elsevier B.V.

    Research areas

  • Amino acids, Bioeconomy, Biomass, Proteins, Resource efficiency
  • Biology