title: Kinetics of soluble microbial product formation in substrate-sufficient batch culture of activated sludge.
abstract: The kinetics of soluble microbial product (SMP) formation under substrate-sufficient conditions appear to exhibit different patterns from substrate-limited cultures. However, energy spilling-associated SMP formation is not taken into account in the existing kinetic models and classification of SMP. Based on the concepts of growth yield and energy uncoupling, a kinetic model describing energy spilling-associated SMP formation in relation to the ratio of initial substrate concentration to initial biomass concentration ( S(0)/ X(0)) was developed for substrate-sufficient batch culture of activated sludge, and was verified by experimental data. The specific rate of energy spilling-associated SMP formation showed an increasing trend with the S(0)/ X(0) ratio up to its maximum value. The SMP productivity coefficient ( alpha(p/e)) was defined from the model on the basis of energy spilling-associated substrate consumption. Results revealed that less than 5% of energy spilling-associated substrate consumption was converted into SMP.
authors.affiliation: School of Civil and Structural Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: J-L
authors.initials: JL
authors.lastname: Rols
mesh_terms: D001419:Bacteria / Q000254:growth & development* / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors; D003470:Culture Media; D004734:Energy Metabolism; D007700:Kinetics; D008954:Models, Biological; D012722:Sewage / Q000382:microbiology*; D013379:Substrate Specificity; D014865:Waste Disposal, Fluid
chemical_list: D003470:Culture Media; D012722:Sewage