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Field Evaluation of Aerators in Activated Sludge Systems JOHN T. PFEFFER, Associate Professor Department of Sanitary Engineering University of Illinois Urbana, Illinois FRED C. HART, Marketing Engineer Dorr-Oliver, Inc. Stamford, Connecticut LAWRENCE A. SCHMID, Assistant Professor Civil Engineering Department Kansas State University Manhattan, Kansas INTRODUCTION Studies of aeration systems in the past five years have demonstrated a great need for evaluation of aeration equipment operating under field conditions. Procedures have been developed for using clean water as standard test conditions. Also, procedures for the evaluation of the systems under field conditions have been developed (1). While performance data are readily available for aeration systems under standard conditions, the translation of these data to field conditions is one of the most perplexing problems in design of aeration systems. Some designers have developed performance specifications for the aerators operating in the field system. This has transferred the problem of equipment sizing from the designer to the supplier and has not solved the overall problem. Benjes and McKinney (2) provided and example of a performance specification and a field technique for evaluating the performance of the aerators in the operating environment of a complete-mix activated sludge system. A performance specification similar to the above was also written for the Topeka, Kansas, contract stabilization plant. This specification required the satisfaction of a performance test in the operating environment. The results of this testing provide important factors to be considered in future evaluation and design. This design and evaluation is unique since the contact stabilization system studied presents a much different problem than a conventional activated sludge plant. This is because of the different characteristics of the mixed liquors in the contact and the reaeration portions of the process. The contact tank contained 2000-3000 mg/1 of suspended solids that are very active, i.e., a low degree of stabilization of the organic material. The reaeration tank contained 6000-9000 mg/1 of a more stable sludge. The aerators are operating two different conditions. BASIC THEORY In order to develop the proper procedure for evaluation of aeration equipment, it is necessary to have an understanding of the fundamental concepts of oxygen transfer theory. - 183 -
Object Description
Purdue Identification Number | ETRIWC196817 |
Title | Field evaluation of aerators in activated sludge systems |
Author |
Pfeffer, John T. Hart, Fred C. Schmid, Lawrence |
Date of Original | 1968 |
Conference Title | Proceedings of the 23rd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,15314 |
Extent of Original | p. 183-194 |
Series |
Engineering extension series no. 132 Engineering bulletin v. 53, no. 2 |
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 | 2009-05-20 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 183 |
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 | Field Evaluation of Aerators in Activated Sludge Systems JOHN T. PFEFFER, Associate Professor Department of Sanitary Engineering University of Illinois Urbana, Illinois FRED C. HART, Marketing Engineer Dorr-Oliver, Inc. Stamford, Connecticut LAWRENCE A. SCHMID, Assistant Professor Civil Engineering Department Kansas State University Manhattan, Kansas INTRODUCTION Studies of aeration systems in the past five years have demonstrated a great need for evaluation of aeration equipment operating under field conditions. Procedures have been developed for using clean water as standard test conditions. Also, procedures for the evaluation of the systems under field conditions have been developed (1). While performance data are readily available for aeration systems under standard conditions, the translation of these data to field conditions is one of the most perplexing problems in design of aeration systems. Some designers have developed performance specifications for the aerators operating in the field system. This has transferred the problem of equipment sizing from the designer to the supplier and has not solved the overall problem. Benjes and McKinney (2) provided and example of a performance specification and a field technique for evaluating the performance of the aerators in the operating environment of a complete-mix activated sludge system. A performance specification similar to the above was also written for the Topeka, Kansas, contract stabilization plant. This specification required the satisfaction of a performance test in the operating environment. The results of this testing provide important factors to be considered in future evaluation and design. This design and evaluation is unique since the contact stabilization system studied presents a much different problem than a conventional activated sludge plant. This is because of the different characteristics of the mixed liquors in the contact and the reaeration portions of the process. The contact tank contained 2000-3000 mg/1 of suspended solids that are very active, i.e., a low degree of stabilization of the organic material. The reaeration tank contained 6000-9000 mg/1 of a more stable sludge. The aerators are operating two different conditions. BASIC THEORY In order to develop the proper procedure for evaluation of aeration equipment, it is necessary to have an understanding of the fundamental concepts of oxygen transfer theory. - 183 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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