Model-based evaluation of microbial mass fractions: effect of absolute anaerobic reaction time on microbial mass fractions
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Date
2010
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Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Ltd
Access Rights
info:eu-repo/semantics/closedAccess
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 (eta(1)) 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.
Description
Keywords
enhanced biological phosphorus removal (EBPR), full-scale systems, phosphorus accumulating microorganisms (PAOs), intracellular phosphorus content, oxygen utilization rate, Biological-Phosphorus-Removal, Waste-Water, Activated-Sludge, Accumulating Organisms, Nutrient Removal, Ph, Glycogen, Temperature, Competition, Metabolism
Journal or Series
Environmental Technology
WoS Q Value
Q3
Scopus Q Value
Volume
31
Issue
5
