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Application of the Continuous Culture Theory to the Trickling Filter Process BILLY H. KORNEGAY, Assistant Professor School of Civil Engineering Georgia Institute of Technology Atlanta, Georgia JOHN F. ANDREWS, Professor Environmental Systems Engineering Clemson University Clemson, South Carolina INTRODUCTION The trickling filter, like other biological processes, depends upon the action of microorganisms for the removal of organic waste. In spite of the differences in geometrical design and physical operation between filters and other aerobic treatment processes the reactions involved are essentially the same and may be'represented by the general reaction equation: Organisms + Substrate + Oxygen- -New Cells + Metabolic Waste Products (1) The above reaction occurs as the liquid waste stream flows over the filter media where the organic waste products are adsorbed and subsequently oxidized by the growth of microorganisms which are attached to the filter media. In view of the fact that the microbial population of a trickhng filter is responsible for the ultimate removal of these wastes, it should be possible to describe this removal in terms of microbial growth by the theory of continuous culture of microorganisms. The kinetics of fixed microbial films have been previously described by Kornegay and Andrews (1) using the Monod (2) growth relation for single stage reactors. This single stage model would certainly not be expected to describe the substrate removal in trickling filters. However, the kinetic principles presented may be extended to other reactor systems in which the predicted substrate removal and residence time distributions more closely approximate those in actual filters. In view of the experimental problems associated with packed towers and inclined plate reactors, a decision was made to use completely mixed, fixed-film reactors in series to approximate the plug-flow conditions associated with the trickling filter. Therefore, theoretical substrate removal equations were developed for both the plug flow and series reactor models. This was done in order to choose a series reactor system which would adequately approximate a plug flow model. THEORY Plug Flow Model The trickhng filter is a multiphase, packed tower and as such must be treated in a different manner than a suspended reactor system, which is normally considered to be homogeneous. This requirement stems from three major facts previously reported or observed for trickhng filters. First, the organisms and substrate do not occupy a -1398-
Object Description
Purdue Identification Number | ETRIWC1969098 |
Title | Application of the continuous culture theory to the trickling filter process |
Author |
Kornegay, Billy H. Andrews, John F. |
Date of Original | 1969 |
Conference Title | Proceedings of the 24th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,16392 |
Extent of Original | p. 1398-1425 |
Series | Engineering extension series no. 135 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-05-21 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 1398 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Application of the Continuous Culture Theory to the Trickling Filter Process BILLY H. KORNEGAY, Assistant Professor School of Civil Engineering Georgia Institute of Technology Atlanta, Georgia JOHN F. ANDREWS, Professor Environmental Systems Engineering Clemson University Clemson, South Carolina INTRODUCTION The trickling filter, like other biological processes, depends upon the action of microorganisms for the removal of organic waste. In spite of the differences in geometrical design and physical operation between filters and other aerobic treatment processes the reactions involved are essentially the same and may be'represented by the general reaction equation: Organisms + Substrate + Oxygen- -New Cells + Metabolic Waste Products (1) The above reaction occurs as the liquid waste stream flows over the filter media where the organic waste products are adsorbed and subsequently oxidized by the growth of microorganisms which are attached to the filter media. In view of the fact that the microbial population of a trickhng filter is responsible for the ultimate removal of these wastes, it should be possible to describe this removal in terms of microbial growth by the theory of continuous culture of microorganisms. The kinetics of fixed microbial films have been previously described by Kornegay and Andrews (1) using the Monod (2) growth relation for single stage reactors. This single stage model would certainly not be expected to describe the substrate removal in trickling filters. However, the kinetic principles presented may be extended to other reactor systems in which the predicted substrate removal and residence time distributions more closely approximate those in actual filters. In view of the experimental problems associated with packed towers and inclined plate reactors, a decision was made to use completely mixed, fixed-film reactors in series to approximate the plug-flow conditions associated with the trickling filter. Therefore, theoretical substrate removal equations were developed for both the plug flow and series reactor models. This was done in order to choose a series reactor system which would adequately approximate a plug flow model. THEORY Plug Flow Model The trickhng filter is a multiphase, packed tower and as such must be treated in a different manner than a suspended reactor system, which is normally considered to be homogeneous. This requirement stems from three major facts previously reported or observed for trickhng filters. First, the organisms and substrate do not occupy a -1398- |
Resolution | 300 ppi |
Color Depth | 8 bit |
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