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MedLine Citation:
PMID:  23186036     Owner:  NLM     Status:  Publisher    
Biogas produced by anaerobic digestion is typically converted into electricity and low value heat. In this study, biogas is microbially transformed into valuable bioproducts. As proof of principle, the production of feed additives, i.e. lipids and poly-hydroxy-butyrate, out of biogas was evaluated. In a first stage, the CO2 in a synthetic biogas was photosynthetically fixed by an algae Scenedesmus sp. culture at an average rate of 192±9 mg CO2 L-1 liquid d-1, resulting in concomitant O2 production. After N-depletion, more than 30% of the 220±7 mg lipids g-1 total organic carbon were unsaturated. In a second stage, the theoretical resulting gas mixture of 60% CH4 and 40% O2 was treated by a methane oxidizing Methylocystis parvus culture, with oxidation rates up to 452±7 mg-1 CH4-C L-1 liquid d-1. By repeated N-limitation, concentrations of 295±50 mg intracellular poly-hydroxy-butyrate g-1 cell dry weight were achieved. Finally, a one-stage approach with controlled co-culturing of both microbial groups resulted in harvestable bioflocs. This is the first time that a total microbial conversion of both greenhouse gases into biomass was achieved without external O2 provision. Based on these results, a biotechnological approach is discussed whereby all kinds of biogas can be transformed into valuable bioproducts.
David Van Der Ha; Leen Nachtergaele; Frederiek-Maarten Kerckhof; Devi Rameiyanti; Peter Bossier; Willy Verstraete; Nico Boon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-27
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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