title: Model-based evaluation of microbial mass fractions: effect of absolute anaerobic reaction time on microbial mass fractions.
abstract: Although enhanced biological phosphorus removal processes (EBPR) are popular methods for nutrient control, unstable treatment performances of full-scale systems are still not well understood. In this study, the interaction between electron acceptors present at the start of the anaerobic phase of an EBPR system and the amount of organic acids generated from simple substrate (rbsCOD) was investigated in a full-scale wastewater treatment plant. Quantification of microbial groups including phosphorus-accumulating microorganisms (PAOs), denitrifying PAOs (DPAOs), glycogen-accumulating microorganisms (GAOs) and ordinary heterotrophic microorganisms (OHOs) was based on a modified dynamic model. The intracellular phosphorus content of PAOs was also determined by the execution of mass balances for the biological stages of the plant. The EBPR activities observed in the plant and in batch tests (under idealized conditions) were compared with each other statistically as well. Modelling efforts indicated that the use of absolute anaerobic reaction (eta1) instead of nominal anaerobic reaction time (eta), to estimate the amount of available substrate for PAOs, significantly improved model accuracy. Another interesting result of the study was the differences in EBPR characteristics observed in idealized and real conditions.
authors.affiliation: Namik Kemal University, Corlu Engineering Faculty, Environmental Engineering Department, Corlu, Tekirdag, Turkey. tolgatuncal@hotmail.com
authors.forename: Tolga
authors.initials: T
authors.lastname: Tunçal
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors; D004583:Electrons; D005285:Fermentation; D006003:Glycogen / Q000737:chemistry; D000860:Hypoxia; D010100:Oxygen / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D006003:Glycogen; D010100:Oxygen