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Temperature Effects on Growth and Yield for Activated Sludge A. A. FRIEDMAN, Research Engineer Department of Civil Engineering and Engineering Mechanics Montana State University Bozeman, Montana E. D. SCHROEDER, Assistant Professor Department of Civil Engineering University of California at Davis Davis, California INTRODUCTION Effects of temperature on the performance of the activated sludge process have been observed and discussed since the process's inception (1, 2). A general procedure for determining or predicting these effects qualitatively has been to apply empirical formulas based on relationships developed from BOD experiments (3, 4). Because the BOD bottle system differs greatly from the activated sludge process, there is no reason to expect relationships to be transferable. However, some success has been achieved with this relationship because of the limited temperature ranges encountered in conventional treatment. Unfortunately, work reported to date does not provide comprehensive kinetic or stoichiometric information and therefore gives little predictive ability. A second major problem with information currently available is the extent of disagreement on the manner and magnitude of temperature effects. This latter problem can be explained in part by the "reaction capacity" concept developed independently by McLellan and Busch (5) and also by Friedman (6). The principal objective of this study was to systematically determine the effects of temperature changes on a completely mixed stirred tank reactor (CFSTR) activated sludge system. A secondary objective was to examine the relationship between the mixed liquor suspended solids concentration in the aerator and the net growth rate, R. Experimental evidence was obtained by varying the temperature of the CFSTR system with as many operational parameters as possible held constant. PREVIOUS INVESTIGATIONS Temperature effects on substrate removal rates for biological wastewater treatment systems have been characterized with the modified Arrhenius equation, | = G T " Tr (1) r where K = unknown reaction rate at temperature T, K = known reaction rate at temperature T , and 1060
Object Description
Purdue Identification Number | ETRIWC197197 |
Title | Temperature effects on growth and yield for activated sludge |
Author |
Friedman, A. A. (Alexander A.) Schroeder, Edward D. |
Date of Original | 1971 |
Conference Title | Proceedings of the 26th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,19214 |
Extent of Original | p. 1060-1073 |
Series | Engineering extension series no. 140 |
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 | 2009-06-25 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 1060 |
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 | Temperature Effects on Growth and Yield for Activated Sludge A. A. FRIEDMAN, Research Engineer Department of Civil Engineering and Engineering Mechanics Montana State University Bozeman, Montana E. D. SCHROEDER, Assistant Professor Department of Civil Engineering University of California at Davis Davis, California INTRODUCTION Effects of temperature on the performance of the activated sludge process have been observed and discussed since the process's inception (1, 2). A general procedure for determining or predicting these effects qualitatively has been to apply empirical formulas based on relationships developed from BOD experiments (3, 4). Because the BOD bottle system differs greatly from the activated sludge process, there is no reason to expect relationships to be transferable. However, some success has been achieved with this relationship because of the limited temperature ranges encountered in conventional treatment. Unfortunately, work reported to date does not provide comprehensive kinetic or stoichiometric information and therefore gives little predictive ability. A second major problem with information currently available is the extent of disagreement on the manner and magnitude of temperature effects. This latter problem can be explained in part by the "reaction capacity" concept developed independently by McLellan and Busch (5) and also by Friedman (6). The principal objective of this study was to systematically determine the effects of temperature changes on a completely mixed stirred tank reactor (CFSTR) activated sludge system. A secondary objective was to examine the relationship between the mixed liquor suspended solids concentration in the aerator and the net growth rate, R. Experimental evidence was obtained by varying the temperature of the CFSTR system with as many operational parameters as possible held constant. PREVIOUS INVESTIGATIONS Temperature effects on substrate removal rates for biological wastewater treatment systems have been characterized with the modified Arrhenius equation, | = G T " Tr (1) r where K = unknown reaction rate at temperature T, K = known reaction rate at temperature T , and 1060 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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