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Section 13. REFINERY WASTES ACCELERATING THE DYNAMIC RESPONSE OF BACTERIAL POPULATIONS IN ACTIVATED SLUDGE SYSTEMS Curtis S. McDowell, Vice President Thomas G. Zitrides, President Polybac Corporation Allentown, Pennsylvania 18103 INTRODUCTION Most industrial biological wastewater treatment systems depend on "natural selection processes" and the "ubiquity principle" to establish appropriate populations of microorganisms for degradation of organic wastewater contaminants. The dynamic response of the populations selected in these systems, consequently, establishes the overall stability and performance of these wastewater treatment systems in the face of changes in strength and/or composition of the wastewater. Since the variation in wastewater characteristics is generally beyond the control of the operator, his control of the dynamic response of the biological system is, in many cases, inadequate. The operator thus struggles, sometimes for weeks, to restore satisfactory treatment following upsets caused by variations in strength and/or composition of the wastewater. In essence, the timeframe required for restoration of the appropriate microbiological populations through natural selection and ubiquity is sometimes long in relation to the time of response needed to protect the receiving waters from contamination. Recently, the apparent dynamic response of "natural populations" has been modified significantly through the application of a spectrum of adapted, mutant microorganisms to a full-scale operating activated sludge system. The improvement in dynamic response as measured by improved performance and plant stabdity was significant in comparison with a parallel operating control system. Thus, the operator has been given a new method of exerting some control on the dynamic response of his treatment system. The improvement in dynamic response generated through introduction of the adapted, mutant microbes prompted development of a model. A model would facditate description of the impact and limitations of applying adapted, mutant bacteria to activated sludge systems, in terms of conventional biological system kinetics. Model development was important, therefore, to future development of this new technique for enhancing the performance of biological treatment systems. This chapter presents a brief case history to dlustrate the impact that adapted, mutant bacteria can have and summarizes progress to date on the development of a model. ACCELERATED DYNAMIC RESPONSE-A CASE HISTORY The impact which adapted, mutant bacteria can have on refinery activated sludge systems is iUustrated by a test program conducted by Exxon, U.S.A. [Ij. Two identical activated sludge systems operating in parallel at a sludge age of approximately 15 days were used to demonstrate the efficacy of adding adapted, mutant microbes. One of the two units (Figure 1) was treated with the adapted, mutant bacteria (Phenobac1^ while the other operated as a control unit. 664
Object Description
Purdue Identification Number | ETRIWC197968 |
Title | Accelerating the dynamic response of bacterial populations in activated sludge systems |
Author |
McDowell, C. S. (Curtis S.) Zitrides, Thomas G. |
Date of Original | 1979 |
Conference Title | Proceedings of the 34th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,30453 |
Extent of Original | p. 664-672 |
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 | 2009-06-24 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page0664 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Section 13. REFINERY WASTES ACCELERATING THE DYNAMIC RESPONSE OF BACTERIAL POPULATIONS IN ACTIVATED SLUDGE SYSTEMS Curtis S. McDowell, Vice President Thomas G. Zitrides, President Polybac Corporation Allentown, Pennsylvania 18103 INTRODUCTION Most industrial biological wastewater treatment systems depend on "natural selection processes" and the "ubiquity principle" to establish appropriate populations of microorganisms for degradation of organic wastewater contaminants. The dynamic response of the populations selected in these systems, consequently, establishes the overall stability and performance of these wastewater treatment systems in the face of changes in strength and/or composition of the wastewater. Since the variation in wastewater characteristics is generally beyond the control of the operator, his control of the dynamic response of the biological system is, in many cases, inadequate. The operator thus struggles, sometimes for weeks, to restore satisfactory treatment following upsets caused by variations in strength and/or composition of the wastewater. In essence, the timeframe required for restoration of the appropriate microbiological populations through natural selection and ubiquity is sometimes long in relation to the time of response needed to protect the receiving waters from contamination. Recently, the apparent dynamic response of "natural populations" has been modified significantly through the application of a spectrum of adapted, mutant microorganisms to a full-scale operating activated sludge system. The improvement in dynamic response as measured by improved performance and plant stabdity was significant in comparison with a parallel operating control system. Thus, the operator has been given a new method of exerting some control on the dynamic response of his treatment system. The improvement in dynamic response generated through introduction of the adapted, mutant microbes prompted development of a model. A model would facditate description of the impact and limitations of applying adapted, mutant bacteria to activated sludge systems, in terms of conventional biological system kinetics. Model development was important, therefore, to future development of this new technique for enhancing the performance of biological treatment systems. This chapter presents a brief case history to dlustrate the impact that adapted, mutant bacteria can have and summarizes progress to date on the development of a model. ACCELERATED DYNAMIC RESPONSE-A CASE HISTORY The impact which adapted, mutant bacteria can have on refinery activated sludge systems is iUustrated by a test program conducted by Exxon, U.S.A. [Ij. Two identical activated sludge systems operating in parallel at a sludge age of approximately 15 days were used to demonstrate the efficacy of adding adapted, mutant microbes. One of the two units (Figure 1) was treated with the adapted, mutant bacteria (Phenobac1^ while the other operated as a control unit. 664 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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