Reduction of the Microbial Load of Digestate by the Cultivation of Galdieria sulphuraria Under Acidic Conditions

Research output: Journal contributionsComments / Debate / ReportsResearch

Authors

Purpose: Organic waste streams with a high microbial load have been used as nutrient sources in the cultivation of heterotrophic microalgae. However, it remains unclear whether an alga-based organic waste utilization can also result in a reduction of the microbial load, and thus in a combined waste utilization and hygenization process. Methods: The heterotrophic cultivation of the microalga Galdieria sulphuraria at a pH of 2 and 45 °C as hygenization method for digestate, which serves as nitrogen source in algae cultivation, was investigated. Attention has been paid to Salmonella sp. and spores, coming from the organic waste stream digestate and its reduction during hydrolysis and cultivation of G. sulphuraria in the resulting hydrolysate. Results: Digestate contained 0.5 × 106 counts per g material, predominantly formed by aerobic, mesophilic organisms. Salmonella sp., yeast and molds, enterobacteriaceae as well as enterococci were diminished within 24 h of hydrolysis or cultivation. During hydrolysis of digestate and cultivation of G. sulphuraria the counts of aerobic, mesophilic organisms could be subsequently reduced by a log reduction factor of 3. The remaining microorganisms were almost exclusively spore forming ones which were reduced by a log reduction factor of 2 during cultivation under acidic conditions. Conclusion: It is suggested here to include the cultivation of G. sulphuraria in future waste management as hygenization process. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
JournalWaste and Biomass Valorization
Volume14
Issue number8
Pages (from-to)2621-2627
Number of pages7
ISSN1877-2641
DOIs
Publication statusPublished - 08.2023

Bibliographical note

Open Access funding enabled and organized by Projekt DEAL. The authors acknowledge the German Federal Ministry of Education and Research for providing funding within the Era-Net Cofund “FACCE SURPLUS” Program (031B0934B).

Publisher Copyright:
© 2023, The Author(s).

Recently viewed

Publications

  1. Properties and processing of magnesium-tin-calcium alloys
  2. Krisenmanagement in Supply Chains
  3. Der "Anschein eines besonders günstigen Angebots" im Sinne des § 16 Abs.1 UWG
  4. Alisa Baremboym between the Corporeal and the Digital
  5. Social Conflicts on Agro-Biotechnology
  6. Das unechte Unterlassungsdelikt
  7. Who does all the research in conservation biology?
  8. Verdrängung und Profit
  9. Evaluating complex mental health care in outpatient care in rural Lower Saxony: an ecologic study
  10. Automotive applications of magnesium and its alloys
  11. Neue Formate transdisziplinärer Forschung
  12. Technology, Megatrends and Work
  13. Anlassbezogene Sekundärmarktpublizität und soziale Netzwerke in Deutschland und den USA
  14. Landscape heterogenity affects the functional diversity of grassland Lepidoptera
  15. The weighted Moran formula for the dimension of generic McMullen-Bedford carpets
  16. The Science and Practice of Landscape Stewardship, Claudia Bieling, Tobias Plieninger. Cambridge University Press (2017)
  17. Energiekonzept: Die Energierevolution
  18. An analysis of training and promotion of entrepreneurship in sustainability management
  19. Gender als didaktisches Prinzip
  20. Impact of monsoon-driven surface ocean processes on a coral off Port Blair on the Andaman Islands and their link to North Atlantic climate variations
  21. Daten gewinnen, darstellen, verarbeiten und interpretieren
  22. A simplified method for determination of pentachlorophenol and hexachlorobenzene in soil contaminated by industrial chemical residues
  23. Different responses of ant species to sugars and amino acids in a subtropical forest of China 
  24. Handball-Brennball
  25. Business Concentration Data for Germany
  26. Schöne Bescherung