Kinetic comparisons of mesophilic and thermophilic aerobic biomass

J.C.T. Vogelaar, A. Klapwijk, H. Temmink, J.B. van Lier

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23 Citations (Scopus)

Abstract

Kinetic parameters describing growth and decay of mesophilic (30degreesC) and thermophilic (55degreesC) aerobic biomass were determined in continuous and batch experiments by using oxygen uptake rate measurements
Kinetic parameters describing growth and decay of mesophilic (30degreesC) and thermophilic (55degreesC) aerobic biomass were determined in continuous and batch experiments by using oxygen uptake rate measurements. Biomass was cultivated on a single soluble substrate (acetate) in a mineral medium. The intrinsic maximum growth rate (mu(max)) at 55degreesC was 0.71 +/- 0.09 h(-1), which is 1.5 times higher than the mu(max) at 30degreesC (0.48 +/- 0.11 h(-1)). The biomass decay rates increased from 0.004 h(-1) at 30degreesC to 0.017 h(-1) at 55degreesC. Monod constants were very low for both types of biomass: 9 +/- 2 mg chemical oxygen demand (COD) 1(-1)at 30degreesC and 3 +/- 2mg COD 1(-1)at 55degreesC. Theoretical biomass yields were similar at 30 and 55degreesC: 0.5 g biomass COD (g acetate COD)(-1). The observed biomass yields decreased under both temperature conditions as a function of the cell residence ti(m)e. Under thermophilic conditions, this effect was more pronounced due to the higher decay rates, resulting in lower biomass production at 55degreesC compared to 30degreesC.
Original languageEnglish
Pages (from-to)81-90
JournalJournal of Industrial Microbiology and Biotechnology
Volume30
Issue number2
DOIs
Publication statusPublished - 2003

Keywords

  • activated sludge
  • biomass
  • substrates
  • aeration
  • respirometry
  • kinetics
  • waste water treatment
  • waste-water treatment
  • soluble microbial products
  • community structure
  • olive oil
  • temperature
  • cultivation
  • reactors
  • removal
  • ihi-91
  • death

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