A new interpretation of ASM2d for modeling of SBR performance for enhanced biological phosphorus removal under different P/HAc ratios


Yagci N., INSEL G., TASLI R., Artan N., RANDALL C., ORHON D.

BIOTECHNOLOGY AND BIOENGINEERING, vol.93, no.2, pp.258-270, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 93 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1002/bit.20701
  • Journal Name: BIOTECHNOLOGY AND BIOENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.258-270
  • Keywords: activated sludge, Activated Sludge Model No. 2d, enhanced biological phosphate removal, microbial storage, phosphate accumulating organism, glycogen accumulating organisms, sequencing batch reactor, model calibration, GLYCOGEN-ACCUMULATING ORGANISMS, SEQUENCING BATCH REACTORS, ACTIVATED-SLUDGE, ACETATE UPTAKE, ANAEROBIC CONDITIONS, PHOSPHATE REMOVAL, NUTRIENT REMOVAL, METABOLIC MODEL, GENERAL-MODEL, WASTE-WATER
  • Istanbul Technical University Affiliated: Yes

Abstract

This study evaluated the prediction capability of Activated Sludge Model No. 2d (ASM2d), for the enhanced biological phosphorus removal (EBPR) performance of a sequencing batch reactor (SBR) receiving variable influent phosphate load. For this purpose, a laboratory-scale SBR was operated with a synthetic feed containing acetate as the sole carbon source. The experiments were conducted in four different Runs to ensure a range of different phosphate/acetate ratios in the influent. Model evaluations were carried out using concentration profiles measured throughout a representative cycle at steady state. An iterative calibration methodology was developed based on sensitivity analysis and applied to four different sets of experimental data on relevant model parameters reflecting SBR performance. ASM2d was able to predict the steady state behavior of the SBR system receiving variable influent phosphate loads only with the recalibrated parameter set. The regular changing pattern of the coefficients could be interpreted with the ability of the SBR system to sustain glycogen accumulating microorganisms, GAOs, which can store substrate under anaerobic conditions without polyphosphate energy, but deriving energy from the degradation of glycogen. Thus they are capable of prevailing at lower P/Ac ratios. The results indicate the need to include glycogen and GAOs as model components for processes involving both phosphate accumulating organisms, (PAOs) and GAOs, in order to obtain a better prediction Of X-PHA and oxygen uptake rate (OUR) profiles in the system. (c) 2005 Wiley Periodicals, Inc.