Kinetic Modeling of Mesophilic Digestion of Swine Manure Containing an Antibiotic Inhibitor (Methane, Biogas)
Fedler, Clifford Bernard
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https://hdl.handle.net/2142/70958
Description
Title
Kinetic Modeling of Mesophilic Digestion of Swine Manure Containing an Antibiotic Inhibitor (Methane, Biogas)
Author(s)
Fedler, Clifford Bernard
Issue Date
1985
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Abstract
A laboratory study was conducted to investigate the Monod kinetic parameters associated with the design and operation of mesophilic digestion of swine manure containing the antibiotic chlortetracycline (CTC). The experimental design was set up to determine the effects retention time (RT) and antibiotic concentration had on the fermentation process. Also, addition of the pure form of the antibiotic to the control substrate was examined. Antibiotic concentrations of 0, 25, 50 and 100 grams CTC per ton of feed were tried at 8-, 12-, 20- and 30-day RT's at an influent substrate concentration of 3 percent volatile solids.
Based on the results obtained from the experiments, a retention time between 12 and 20 days was determined to be optimal for anaerobic digestion of swine manure at any concentration of the antibiotic. Also, addition of the pure antibiotic had no effect on the fermentation process. Therefore, it was concluded that when conducting similar experiments, which examine the effects of an antibiotic of anaerobic digestion, the manure must be collected from the animal receiving the antibiotic in its diet.
The methane production was reduced from 10 to 25 percent when the CTC concentration in the swine diet was at 100 grams per ton of feed. Also, it was concluded that the fermentation process was not able to acclimate to the presence of the CTC and obtain the same level of efficiency as the control within the time frame of this experiment.
The Maximum specific growth rate of the bacteria declined from 0.217/day to 0.183/day when the CTC concentration in the swine diet was 100 grams per ton of feed. This decline represents a substantial drop in the overall process efficiency, thus not allowing adequate conversion of the substrate to the normal end product, methane. This type of inhibition is similar to the uncompetitive type of inhibition in an enzyme reaction.
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