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AuthorGruber-Brunhumer, M.
AuthorNussbaumer, M.
AuthorJerney, J.
AuthorLudwig, I.
AuthorZohar, E.
AuthorLang, I.
AuthorBochmann, G.
AuthorSchagerl, M.
AuthorObbard, J.P.
AuthorFuchs, W.
AuthorDrosg, B.
Available date2017-05-21T11:22:29Z
Publication Date2016-07
Publication NameAlgal Researchen_US
Identifierhttp://dx.doi.org/10.1016/j.algal.2016.04.016
CitationM. Gruber-Brunhumer, M. Nussbaumer, J. Jerney, I. Ludwig, E. Zohar, I. Lang, G. Bochmann, M. Schagerl, J.P. Obbard, W. Fuchs, B. Drosg, Two-stage cultivation of N-rich and N-deprived Acutodesmus obliquus biomass: Influence of cultivation and dewatering methods on microalgal biomass used in anaerobic digestion, Algal Research, Volume 17, July 2016, Pages 105-112
ISSN22119264
URIhttp://www.sciencedirect.com/science/article/pii/S2211926416301400
URIhttp://hdl.handle.net/10576/5512
AbstractMicroalgae can be manipulated to accumulate certain cellular compounds of interest without the need for genetic modification - simply by controlling growth parameters such as nitrogen (N). Therefore, A. obliquus was batch-cultivated in a sleevebag photobioreactor system in N-deprived and N-rich medium to test the effect of N-status on CH4 yield under anaerobic digestion. Two different dewatering methods, i.e., centrifugation and sedimentation were applied to each resulting biomass. For the N-deprived biomass, cellular protein content dropped by 42–49%, and lipids increased up to 20% relative to the N-rich biomass. The highest CH4 yields were achieved with N-deprived, sedimented biomass (391 Nm3 t− 1 VS = normalized gas volume in m3 corrected to norm temperature and pressure per unit volatile solids), followed by N-rich sedimented biomass (361 Nm3 t− 1 VS). Centrifugation led to lower CH4 yields, where N-deprived biomass achieved 280 compared to 200 Nm3 t− 1 VS for N-rich microalgae. Our data indicate that valuable organic material was lost to the supernatant during the centrifugation step. We conclude that not only the N-status of cultivation, but also the biomass dewatering method has an instrumental effect on CH4 yield of microalgal biomass in anaerobic digestion.
SponsorThis work was performed in the frame of the Austrian COMET program under grant number 834018. It has received funding from the Republic of Austria and the Federal Provinces of Styria, Lower Austria and Burgenland. Co-funding from the industry partner Erber Group shall be highly acknowledged.
Languageen
PublisherElsevier
SubjectBiogas
SubjectMicroalgae
SubjectN-deprivation
SubjectBiochemical methane potential
SubjectPhotobioreactor
SubjectTwo-stage cultivation
TitleTwo-stage cultivation of N-rich and N-deprived Acutodesmus obliquus biomass: Influence of cultivation and dewatering methods on microalgal biomass used in anaerobic digestion
TypeArticle
Pagination105-112
Volume Number17


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