title: Effect of cycle time on polyhydroxybutyrate (PHB) production in aerobic mixed cultures.
abstract: The aim of this study was to investigate the effect of cycle time on polyhydroxybutyrate (PHB) production under aerobic dynamic feeding system. The acetate-fed feast and famine sequencing batch reactor was used to enrich PHB accumulating microorganism. Sequencing batch reactor (SBR) was operated in four different cycle times (12, 8, 4, and 2 h) fed with a synthetic wastewater. The system performance was determined by monitoring total dissolved organic carbon, dissolved oxygen, oxidation-reduction potential, and PHB concentration. In this study, under steady-state conditions, the feast period of the SBR was found to allow the PHB storage while a certain part of stored PHB was used for continued growth in famine period. The percentage PHB storages by aerobic microorganism were at 16, 18, 42, and 55% for the 12, 8, 4, and 2-h cycle times, respectively. The PHB storage was increased as the length of the cycle time was decreased, and the ratio of the feast compared to the total cycle length was increased from around 13 to 33% for the 12 and 2-h cycle times, respectively.
authors.affiliation: Department of Bioengineering and Science, Kahramanmaras Sutcu Imam University, Kahramanmaras, 46100, Turkey.
authors.forename: Sebnem
authors.initials: S
authors.lastname: Ozdemir
authors.forename: Dilek
authors.initials: D
authors.lastname: Akman
authors.forename: Kevser
authors.initials: K
authors.lastname: Cirik
authors.forename: Ozer
authors.initials: O
authors.lastname: Cinar
mesh_terms: D000085:Acetates / Q000378:metabolism*; D000332:Aerobiosis; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D006885:Hydroxybutyrates / Q000378:metabolism*; D007700:Kinetics; D059013:Microbial Consortia / Q000502:physiology*; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism*; D013997:Time Factors; D062065:Wastewater / Q000382:microbiology*
chemical_list: D000085:Acetates; D006885:Hydroxybutyrates; D009584:Nitrogen; D010100:Oxygen; D062065:Wastewater