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• W1567018145 abstract "It is now widely accepted that EBPR occurs as a result of the predominance of a group of bacteria, commonly called phosphate accumulating organisms (PAOs), with the capability of storing polyphosphate within the cell. EBPR is only sustained when the activated sludge system is operated in an anaerobic/aerobic sequence and the biomass is fed with short chain fatty acids (SCFAs) like acetate, during the anaerobic phase. In this phase, PAOs activate the metabolic tools to take up acetate and to store it as polyhydroxyalkanoates (PHAs), mainly polyhydroxybutyrate (PHB). PHA storage proceeds using the internal polyphosphate (poly-P) pool as energy source resulting in a release of orthophosphate (Pi). In the subsequent aerobic stage, PAOs grow on the internally stored PHA and take up orthophosphate for the replenishment of poly-P reserves that increase the P content of sludge. Higher P removal is achieved by withdrawing excess sludge with high P-content. Some observations given in the literature may be related to the presence of other types of bacteria, later called glycogen accumulating organisms (GAOs), that are capable of storing substrate under anaerobic conditions without using energy from P release. This implies the involvement of an energy source other than poly-P in EBPR systems, thus leading to a drastic decrease in the P released/substrate uptake ratio. It should be noted that during anaerobic acetate metabolism in GAOs, energy and reducing power are provided only by glycogen degradation without any poly-P involvement. This necessitates a metabolic pathway for the regeneration of the surplus NADH2 produced during glycolysis to maintain the redox balance inside the cell. This paper proposes a biochemical model for the acetate uptake by a mixed culture of PAOs and GAOs under anaerobic conditions. The proposed model is used to establish basic stoichiometric balances for organic carbon, ATP and reducing power, through appropriate metabolic pathways. PAOs and GAOs have similar metabolism except for their internal energy sources. Both of them uptake acetate anaerobically and store it as PHA. During PHA storage, the redox balance is regulated by the consumption of glycogen. Their metabolisms basically differ in the energy source utilized: While PAOs have the metabolic complement to use both poly-P cleavage and glycolysis as their energy supply; GAOs solely depend on glycogen for this purpose. Basic reactions of the metabolic model are given involving the same sequence for the two types of microorganisms, except for the formation of propionyl-CoA: Acetate uptake and activation to Acetyl-CoA, glycogen degradation to pyruvate, oxidative decarboxylation of pyruvate, formation of propionyl-CoA from pyruvate, formation of propionyl-CoA from acetyl-CoA, PHB synthesis, PHV synthesis and Poly-P cleavage. With this model, behavior of enhanced biological phosphorus systems is better evaluated in terms of the resulting overall stoichiometry of a mixed culture of PAOs and GAOs competing for the same substrate under anaerobic conditions. Besides, the modeling of enhanced biological phosphate removal is improved by introducing the mechanistic description of a mixed culture of glycogen and phosphate accumulating organisms competing for acetate, and glycogen metabolism of the latter. A new process stoichiometry is defined for the mixed culture based upon previously developed metabolic concepts and models. Thus, ASM2d is considered as a base-model since it basically embodies three different types of microorganisms: heterotrophs, autotrophs and phosphorus accumulating organisms describing the nutrient removal processes in activated sludge systems. In ASM2d, the phosphorus accumulating organisms, XPAOs takes up acetate in the availability of acetate and store only in the form of polyhydroxyalkanoate, XPHA with the stoichiometric ratio of HAc/PHA:1. In subsequent aerobic or anoxic conditions, the processes of XPAOs growth and the phosphate uptake utilize XPHA. The stoichiometry and processes for the autotrophs and heterotrophs are taken as the same in ASM2d, accordingly. Glycogen metabolism of PAOs and GAO metabolism included into the model, individually. It is assumed that under anaerobic condition, the PHA pool is replenished by the consumption of both external acetate and glycogen with the stoichiometry of YSA and 1-YSA, respectively by assuming PHA is equal to unit COD. Model development mainly relied on evaluation of critical coefficients based on proposed metabolic relationships related to the interactive growth of GAOs and PAOs in the mixed cultures. The model is able to describe the split of acetate utilization between PAOs and GAOs, accurately as predicted by related metabolic relationship. Keywords: Enhanced biological phosphate removal, phosphate accumulating organisms, glycogen accumulating organisms, mathematical model, metabolic model." @default.
• W1567018145 created "2016-06-24" @default.
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• W1567018145 date "2010-03-03" @default.
• W1567018145 modified "2023-09-27" @default.
• W1567018145 title "Fosfor ve glikojen depolayan organizmaların metabolik ve matematik modelleri" @default.
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