The Role of Streambed Biofilms in The Removal of Biodegradable Contaminants From Shallow Streams
Gantzer, Charles Jacobs, III
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Permalink
https://hdl.handle.net/2142/77330
Description
Title
The Role of Streambed Biofilms in The Removal of Biodegradable Contaminants From Shallow Streams
Author(s)
Gantzer, Charles Jacobs, III
Issue Date
1986
Department of Study
Civil and Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
Previous research has demonstrated that streambed biofilms are important in contaminant removal in shallow streams. However, the ability to predict the rate at which this removal occurs did not exist. To develop a model describing streambed biofilm activity, experiments were conducted in an 8-meter long artificial stream to assess both the short-term and long-term effects stream velocity had on COD removal rates. The rate at which streambed biofilms removed COD from gravel and cobble streambeds was more sensitive to short-term changes in water velocity than would be predicted based on changes in mass transfer alone; this was more evident with the cobble. The results suggested that the amount of surface area active in COD removal was a function of stream velocity. The sensitivity of removal rate (mass transport and active surface area effects) to short-term velocity changes was described as a function of Reynolds number based on shear velocity and streambed particle diameter; the resulting equations for the gravel and cobble streambeds were streambed-particle-size specific.
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