Effect of the Fluid Velocity on the Biofilm Development

by Yoshihiko Hosoi, Univ of Tokushima, Tokushima, Japan,
Hitoshi Murakami, Univ of Tokushima, Tokushima, Japan,

Document Type: Proceeding Paper

Part of: Water Forum '86: World Water Issues in Evolution


In order to get basic information concerning the application of a biological treatment to the ammonia nitrogen removal from drinking water, we considered the relation between the biofilm development of nitrifying bacteria and the fluid flow. The experiment showed the high dependence of the biofilm development on the shear velocity. There exists a suitable shear velocity which gives the maximum biofilm accumulation. The increase of the shear velocity accelerated both the ammonia removal and biofilm detachment. We made a biofilm growth model and examined the growth curve in relation to the shear velocity.

Subject Headings: Fluid velocity | Shear stress | Biofilm | Water treatment | Flow measurement | Fluid flow | Nitrogen | Water flow

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