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Optimization of polyhydroxybutyrate production by mixed cultures submitted to aerobic dynamic feeding conditions

Serafim, Luísa S. ; Lemos, Paulo C. ; Oliveira, Rui ; Reis, Maria A.M.

Biotechnology and bioengineering, 2004-07, Vol.87 (2), p.145-160 [Revista revisada por pares]

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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Título:
Optimization of polyhydroxybutyrate production by mixed cultures submitted to aerobic dynamic feeding conditions
Autor: Serafim, Luísa S. ; Lemos, Paulo C. ; Oliveira, Rui ; Reis, Maria A.M.
Materias: Acetates - metabolism ; Acetates - pharmacology ; activated sludge ; aerobic dynamic feeding ; Algorithms ; Ammonia - metabolism ; Ammonia - pharmacology ; Bacteria, Aerobic - drug effects ; Bacteria, Aerobic - growth & development ; Bacteria, Aerobic - metabolism ; Biological and medical sciences ; Biomass ; Biopolymers - biosynthesis ; Bioreactors - microbiology ; Biotechnology ; Carbon ; Fundamental and applied biological sciences. Psychology ; Hydrogen-Ion Concentration ; Hydroxybutyrates - analysis ; Hydroxybutyrates - metabolism ; Kinetics ; Methods. Procedures. Technologies ; Microbial engineering. Fermentation and microbial culture technology ; Nitrogen ; Oxygen ; Oxygen - analysis ; Oxygen - metabolism ; Oxygen - pharmacology ; Polyesters - analysis ; Polyesters - metabolism ; polyhydroxyalkanoates ; polyhydroxybutyrate ; sequencing batch reactor ; Sewage - microbiology ; Sludge ; Time Factors
Es parte de: Biotechnology and bioengineering, 2004-07, Vol.87 (2), p.145-160
Notas: istex:48DEE38D9DA3925794F51EA1DF49B25A5DE106EE
ark:/67375/WNG-HKPBSXMV-7
Fundação para a Ciência e Tecnologia (FCT) - No. POCTI/BIO/35675/2000; No. PRAXIS XXI BD/18287/98 (to L.S.S.), BPD/20197/99 (to P.C.L.)
ArticleID:BIT20085
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descripción: Activated sludge submitted to aerobic dynamic feeding conditions showed a good and stable capacity to store polyhydroxybutyrate (PHB). The system, working for 2 years, selected a microbial population with a high PHB storage capacity. The influence of carbon and nitrogen concentrations on the PHB accumulation yield was studied in a range of 15–180 Cmmol/l for acetate and 0–2.8 Nmmol/l for ammonia. Low ammonia concentrations favored PHB accumulation. The maximum PHB content, 67.5%, was obtained for 180 Cmmol/l of acetate supplied in one pulse. However, such high substrate concentration proved to be inhibitory for the storage mechanism, causing a slowdown of the specific PHB storage rate. In order to avoid substrate inhibition, 180 Cmmol/l of acetate was supplied in different ways: continuously fed and in three pulses of 60 Cmmol/l each. In both cases the specific PHB storage rate increased and the PHB content obtained were 56.2% and 78.5%, respectively. The latter value of PHB content is similar to that obtained by pure cultures and was never reported for mixed cultures. Addition of acetate by pulses controlled by the oxygen concentration was kept for 16 days, the PHB content being always above 70% of cell dry weight. © 2004 Wiley Periodicals, Inc.
Editor: Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Idioma: Inglés

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Optimization of polyhydroxybutyrate production by mixed cultures submitted to aerobic dynamic feeding conditions

Serafim, Luísa S. ; Lemos, Paulo C. ; Oliveira, Rui ; Reis, Maria A.M.

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

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