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Holistic exploitation of pulsed electric field (PEF)-treated and lipid extracted microalgae Auxenochlorella protothecoides, utilizing anaerobic digestion (AD)

Straessner, Ralf 1; Nikolausz, Marcell; Silve, Aude 1; Nazarova, Natalja 1; Wuestner, Ruediger 1; Papachristou, Ioannis 1; Akaberi, Sahar 1; Leber, Klaus 1; Mueller, Georg 1; Frey, Wolfgang 1
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

This study proposes a cascade processing of the lipid-rich microalgae Auxenochlorella protothecoides. Freshly harvested biomass is pre-concentrated to 100 g/kgsusp and then pretreated using pulsed electric fields (PEF). PEF-treatment, which affects permeability of cells membrane, induces a spontaneous release of microalgal ingredients into the surrounding medium, mostly carbohydrates and micronutrients, which can be recovered. After separation of this aqueous fraction, lipid extraction is performed on the remaining wet pellet using an ethanol-hexane blend. After recovery of those different valuables, it was considered, to convert the rest biomass (cell envelope and most of the other remaining hard- or non-extractable components), to storable energy. Anaerobic digestion (AD) of the remains to biogas was considered to be a promising solution. AD-processes have the charm that unprocessed wet microalgal biomass, as well as wet organic biomass residues from previous extraction steps can be utilized directly without further purification or drying steps. The obtained biogas can then be upgraded to methane for an energetic use.

PEF-treated algal biomass showed a 10 % increased methane outcome (467 mLnorm/gVS) compared to the untreated sample. ... mehr


Postprint §
DOI: 10.5445/IR/1000154706
Veröffentlicht am 28.12.2023
Originalveröffentlichung
DOI: 10.1016/j.algal.2022.102950
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2023
Sprache Englisch
Identifikator ISSN: 2211-9264
KITopen-ID: 1000154706
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Erschienen in Algal Research
Verlag Elsevier
Band 69
Seiten Art._Nr.: 102950
Vorab online veröffentlicht am 27.12.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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