Accession Number : ADP000736

Title :   Processes Involved in Early Biofilm Formation,

Corporate Author : SWISS FEDERAL INST FOR WATER RESOURCES AND WATER POLLUTION CONTROL DUEBENDORF

Personal Author(s) : Bryers,James D.

Report Date : 1982

Pagination or Media Count : 29

Abstract : Results of Series I experiments provided the following information: the rate of biofilm COD accumulation during its early formation stages was described mathematically using a first-order rate expression. The resultant first-order rate constant was a linear function of suspended biomass concentration and growth rate, and Reynolds number. Results of Series II work, for the thin aerobic biofilm investigated, showed the following: (1) Although particle deposition contributes significantly to the initiation of biofilm development, its relative role in biofilm net accumulation decreases with time. (2) Biofilm decay due to maintenance requirement is insignificant for the thin biofilm considered; and (3) Biofilm production and shear removal processes contribute significantly to early biofilm accumulation. Shear removal rates drastically increase as the film exceeds the viscous sublayer.

Descriptors :   *Waste water, *Films, *Water treatment, *Waste treatment, Models, Equations, Rates, Deposition, Requirements, Maintenance, Kinetics, Removal

Distribution Statement : APPROVED FOR PUBLIC RELEASE