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Related Concept Videos

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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Author Spotlight: Scaling Microalgal Biotechnology for Enhanced Biomethane Production
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Highly efficient methane generation from untreated microalgae biomass.

Viktor Klassen1, Olga Blifernez-Klassen1, Daniel Wibberg1

  • 1Department of Biology/Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany.

Biotechnology for Biofuels
|July 21, 2017
PubMed
Summary
This summary is machine-generated.

Microalgae cultivation under limited nitrogen conditions optimizes biomass for efficient anaerobic digestion, yielding high methane productivity without pretreatment. This approach achieves nearly maximum energy conversion efficiency for sustainable biofuel generation.

Keywords:
Ammonia/ammonium inhibitionBiofuelBiogasContinuous anaerobic fermentation/digestionMaximal energy conversion efficiencyMethaneMicroalgae mono-substrateMicrobial communityNitrogen limitation

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Microbiology

Background:

  • Microalgae are researched for efficient solar energy conversion into chemical energy for biofuels.
  • Anaerobic digestion of microalgae biomass for biogas is attractive but challenging due to cell wall recalcitrance and protein content.
  • Sustainable fuel generation necessitates avoiding energy-intensive biomass pretreatments.

Purpose of the Study:

  • To investigate the impact of microalgae cultivation conditions on anaerobic digestion efficiency.
  • To assess the feasibility of using microalgae as a mono-substrate for high-efficiency methane production without pretreatment.
  • To analyze microbial community shifts in response to different cultivation strategies.

Main Methods:

  • Cultivating microalgae in replete and nitrogen-limited media.
  • Performing continuous anaerobic digestion of both biomass types.
  • Analyzing biogas and methane productivity, inhibitory substances, and microbial community structure.

Main Results:

  • Nitrogen-limited biomass (low-N BM) resulted in stable digestion with high biogas/methane productivity (750 ± 15 mLN g-1 VS day-1) and 84% energy conversion efficiency.
  • The microbial community in stable digestion was dominated by Bacteroidetes and Methanosaetaceae.
  • Fermentation of replete nitrogen biomass (replete-N BM) was less productive (131 ± 33 mLN CH4 g-1 VS day-1) and failed due to acidosis from high ammonia concentrations.
  • Microbial communities differed significantly between stable and failed digestion processes.

Conclusions:

  • Microalgae cultivation conditions critically influence anaerobic digestion efficiency.
  • Microalgae biomass can be used as a mono-substrate for highly efficient continuous methane fermentation without pretreatment.
  • This method achieves near-maximum practical energy conversion efficiency from biomass to methane.