Competition in biofilms

T. C. Zhang, Y. C. Fu, P. L. Bishop

Research output: Contribution to journalConference article

54 Citations (Scopus)

Abstract

Competitions in biofilms for substrate and space have been studied by using a microelectrode technique and a microslicing technique. Three different kinds of biofilms, cultured by laboratory-scale rotating drum biofilm reactors (RDBR) with synthetic wastewater, have been used as test materials. Oxygen, ammonium-nitrogen, nitrate-nitrogen, and pH concentration profiles in the biofilms were measured using microelectrodes. Experimental results showed that: 1) an increase of organic loading rate would result in a decrease of DO concentration in the biofilm. However, after the organic loading rate exceeded a certain value, the oxygen profiles within the biofilm did not change any more, 2) Heterotrophs competed for oxygen with nitrifiers, which resulted in the inhibition of nitrification because of the shortage of oxygen. Glucose itself, however, did not inhibit the nitrification processes; and 3) The competition for substrate in biofilms resulted in a stratified biofilm structure. Experiments showed that competition in biofilms resulted in non-uniform spatial distributions of bacterial populations and metabolically active bacteria. The spatial distributions of biotic and abiotic components in turn affected the substrate transfer and substrate competition within the biofilm. Traditional biofilm modelling will fail in many cases if they are based on substrate removal kinetics and uniform distributions of biofilm properties.

Original languageEnglish (US)
Pages (from-to)263-270
Number of pages8
JournalWater Science and Technology
Volume29
Issue number10-11
StatePublished - Jan 1 1994
EventProceedings of the IAWQ 2nd International Specialized Conference on Biofilm Reactors - Paris, Fr
Duration: Sep 29 1993Oct 1 1993

Fingerprint

Biofilms
biofilm
substrate
Substrates
oxygen
Oxygen
Nitrification
Microelectrodes
Spatial distribution
nitrification
spatial distribution
Nitrogen
nitrogen
Glucose
Nitrates
Bacteria
glucose
Wastewater
ammonium
nitrate

Keywords

  • Biofilm
  • Competition
  • DO concentration
  • Heterotrophs
  • Microelectrode
  • Nitrifiers
  • Space
  • Substrate
  • Substrate profile

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

Cite this

Zhang, T. C., Fu, Y. C., & Bishop, P. L. (1994). Competition in biofilms. Water Science and Technology, 29(10-11), 263-270.

Competition in biofilms. / Zhang, T. C.; Fu, Y. C.; Bishop, P. L.

In: Water Science and Technology, Vol. 29, No. 10-11, 01.01.1994, p. 263-270.

Research output: Contribution to journalConference article

Zhang, TC, Fu, YC & Bishop, PL 1994, 'Competition in biofilms', Water Science and Technology, vol. 29, no. 10-11, pp. 263-270.
Zhang TC, Fu YC, Bishop PL. Competition in biofilms. Water Science and Technology. 1994 Jan 1;29(10-11):263-270.
Zhang, T. C. ; Fu, Y. C. ; Bishop, P. L. / Competition in biofilms. In: Water Science and Technology. 1994 ; Vol. 29, No. 10-11. pp. 263-270.
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