Scholarly Work - Center for Biofilm Engineering
Permanent URI for this collectionhttps://scholarworks.montana.edu/handle/1/9335
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Item Stability Analysis of a Binary Culture Chemostat Experiencing Biofilm Formation(1986) Bryers, James D.Time-dependent biofilm formation effects on continuous fermenter operation are modelled here for a binary culture of microorganisms growing on a single substrate. Dynamic computer solutions are detailed for a mixed culture of one microbe a having a higher growth rate than a second microbe b for two hypothetical scenarios of microbe b having different magnitudes of cellular deposition rate. A stability analysis of the resultant steady-states is also provided. Biofilm effects on the estimation of kinetic and stoichiometric parameters in a chemostat plus the impact of biofilms on mixed culture dynamics are discussed.Item The Death and Lysis of Microorganisms in Environmental Processes(1986-10) Mason, C. A.; Hamer, G.; Bryers, James D.Item Processes Governing Early Biofilm Formation(1982-11) Bryers, James D.; Characklis, William G.Item Processes Governing Primary Biofilm Formation(1982-11) Bryers, James D.; Characklis, William G.Biofilm accumulation under turbulent flow condition on the surface of a circular tube is the net result of several process including the following: (1) transport and firm adhesion of soluble components and microbial cell to the surface; (2) metabolic conversions within the biofilm in cluding growth and maintenance decay process; (3) detachment of portions of the biofilm and reentrainment in the bulk fluid. Experiments in tabular reactor were designed to measure the rates of these process during the early stages of biofilm accumulation as a function of the Reynolds number and suspended biomass concentration. Results indicate deposition (i.e., combined transport and adsorption) is only important in the very early stages of biofilm accumulation and is significantly influenced by negligible for the thin biofilms encountered in these experiments. Net biofilm production rates in all experiments decrease to same level and this level is not affected by changes in Reynolds number or suspended biomass concentration. Biofilm detachment rate increases continuously with biofilm accumulation and with increasing Reynolds number.Item Kinetics of initial biofilm formation within a turbulent flow system(1981) Bryers, James D.; Characklis, William G.A kinetic expression is presented which describes biofouling film development from clean surface conditions to the onset of fluid frictional resistance increase. Biofouling experiments were conducted in a system which provides control of biological activity in the bulk fluid while simulating turbulent flow conditions. The effect of three system parameters - dispersed biomass concentration, Reynolds Number, and dispersed biomass growth rate - on the rate of initial biofilm formation is presented. Primary biofilm accumulation is described using a first order rate expression with the resultant first order rate constant a linear function of the considered parameters. (A)Item Measurement of primary biofilm formation(1980) Bryers, James D.; Characklis, William G.Item Biofouling film development and its effects on energy losses: a laboratory study(1980) Characklis, William G.; Bryers, James D.; Trulear, Michael Gerald; Zelver, NickExperiments on biofouling of tubes are reported. Processes leading to fouling biological film development are identified and the procedures used in the experimental work are described. Results concerning the growth of biofouling and its effects on fluid friction and heat transfer are presented.Item Microbial film development and associated energy losses(1979) Bryers, James D.; Characklis, William G.; Zelver, Nick; Nimmons, M. G.Item Control of microbial fouling in circular tubes with chlorine(1977) Norrman, G.; Characklis, William G.; Bryers, James D.Item Biofilm Formation and Chemostat Dynamics: Pure and Mixed Culture Considerations(1984-08) Bryers, James D.Time-dependent biofilm formation effects on continuous fermenter operation are modelled here in general for a mixed culture of N different microorganisms growing on a single substrate. Dynamic computer solutions are detailed for two versions of the general model: a pure culture and a simple two-cell mixed culture. Pure culture model predictions compare favorably with two pure culture experiments in the literature where significant biofilm formation was noted. A mixed culture of one microbe (C1) having a higher growth rate than a second microbe (C2) is simulated for two hypothetical scenarios of microbe C2 having different magnitudes of cell deposition rate. Biofilm effects on the estimation of kinetic and stoichiometric parameters in both model versions, plus the impact of biofilms on mixed culture dynamics, are discussed.