Adhesion strength of biofilm developed in an attached-growth reactor

A. Ohashi, Hideki Harada

Research output: Contribution to journalConference articlepeer-review

96 Citations (Scopus)

Abstract

In this study a novel methodology is proposed to estimate the adhesion strength of biofilm developed in an attached-growth reactor. The time variation of adhesion strength was quantified in the course of formation or a biofilm consisting or denitrifiers. The model biofilm was formed on the surfaces of polyvinyl-chloride plates placed in a rectangular open-channel reactor. The result indicates that the adhesion strength was not uniformly distributed throughout biofilm but had a tendency to increase with biofilm depth and with the progression of biofilm formation. For example on the 32nd day from start-up the adhesion strength near the substratum interface attained a level in the order of 102 dyne.cm-2, whereas that in the vicinity of biofilm outer surface was only in the order of 100 dyne.cm-2. As well the biofilm dry density did not remain constant throughout biofilm having a tendency similar to that of the adhesion strength. A strong correlation was observed between the dry density and the extracellular biopolymer content per unit biofilm volume. It was suggested that the adhesion strength was significantly affected by the dry density.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalWater Science and Technology
Volume29
Issue number10-11
Publication statusPublished - 1994 Jan 1
Externally publishedYes
EventProceedings of the IAWQ 2nd International Specialized Conference on Biofilm Reactors - Paris, Fr
Duration: 1993 Sep 291993 Oct 1

Keywords

  • Adhesion strength
  • Attached biofilm reactor
  • Biofilm detachment
  • Biofilm dry density
  • Extracellular biopolymer

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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