Effect of environmental conditions on the occurrence of Microthrix parvicella in activated sludge

  • Slijkhuis H
  • Deinema M
  • 3

    Readers

    Mendeley users who have this article in their library.
  • 34

    Citations

    Citations of this article.

Abstract

The filamentous bacterium Microthrix parvicella often causes poor settling of activated sludge in oxidation ditches supplied with domestic sewage. This organism utilizes preferably fatty acids as a carbon and energy source and it requires reduced nitrogen and reduced sulphur compounds for growth. In activated sludge fed with a synthetic wastewater containing oleic acid, abundant growth of M. parvicella was obtained in a bench scale plant operated at a low oxygen concentration. On the other hand, in control plants operated at a high oxygen concentration or fed with a synthetic wastewater containing glucose, this organism disappeared. These results may explain the excessive growth of M. parvicella in oxidation ditches supplied with raw domestic sewage as this type of wastewater contains a considerable amount of fatty matter and the process is usually operated at a low oxygen concentration in the mixed liquor. Bulking of sludge caused by M. parvicella can be cured by an enhanced oxygen supply. © 1988.

Author-supplied keywords

  • Microthrix parvicella
  • activated sludge
  • bulking sludge
  • filamentous bacteria

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • H. Slijkhuis

  • M. H. Deinema

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free