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Experimental Conditions in the Study of tl Physiological Ecology of Activated Sludge JOHN J. CIBULKA, Research Associate Sanitary and Water Resources, Department of Civil Engineering Vanderbilt University Nashville, Tennessee GEORGE W. MALANEY, Associate Professor of Sanitary Biology Department of Civil Engineering Vanderbilt University Nashville, Tennessee INTRODUCTION During the past decade the people of this nation have become increasingly aware of and alarmed over the threat of a diminishing supply of usable water. Efficient and rapid reclamation of water for re-use is linked with the improvement of biological aerobic treatment methods to the point that they are capable of rapid renovation of enormous quantities of waste water. The most popular biological unit is the activated sludge system which employs a heterogeneous population of microorganisms to stabilize wastes. Many investigators have studied the activated sludge process with a pragmatic goal of improved design and treatment, but as van Gils states, few have been concerned with the fundamental nature of the purification process (1). Gaudy and Gaudy (2) indicate one approach to this problem by stating, "The challenging aspect to researchers in this field is the necessity of uncovering facts of predictive value for natural populations rather than for a single culture. " However, they add, "Ideally, pure culture studies may form useiul tools for the investigations of heterogeneous populations." Studies on the ability of pure cultures of activated sludge microorganisms to clarify sewage have been made by a number of investigators. Butterfield, et al., (3), Ruchhoft, et al., (4), and Buck and Keefer (5), employing zoogleal species isolated from activated sludge, found that BOD removal by pure cultures is similar to that attained with the mixed flora of whole sludge. However, other workers reported that no pure culture was able to clarify domestic wastes as efficiently as sewage-seeded sludge, although some species approach 90 per cent efficiency. When van Gils compared the oxidation of selected organic compounds by pure cultures and by whole sludge, he found that members of the genera Pseudomonas, Anhrobacter, Flavobacterium, and Zooglea give oxygen consumption curves similar to those of activated sludge (1). No work comparing whole sludge oxidation patterns with those of pure and mixed cultures, employing the ratios of microbial populations existing in an aeration tank has been reported. Knowledge of the effect of one species upon another species or group of species is fundamental to attaining the goal of the systems analyst, i. e., development of a picture of the activated sludge aeration tank environment as a predictable functioning ecosystem. Current investigations on the physiological ecology of activated sludge micro- - 78 -
Object Description
Purdue Identification Number | ETRIWC196709 |
Title | Experimental conditions in the study of the physiological ecology of activated sludge |
Author |
Cibulka, John J. Malaney, G. W. (George W.) |
Date of Original | 1967 |
Conference Title | Proceedings of the 22nd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,14179 |
Extent of Original | p. 78-91 |
Series |
Engineering extension series no. 129 Engineering bulletin v. 52, no. 3 |
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 78 |
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 | Experimental Conditions in the Study of tl Physiological Ecology of Activated Sludge JOHN J. CIBULKA, Research Associate Sanitary and Water Resources, Department of Civil Engineering Vanderbilt University Nashville, Tennessee GEORGE W. MALANEY, Associate Professor of Sanitary Biology Department of Civil Engineering Vanderbilt University Nashville, Tennessee INTRODUCTION During the past decade the people of this nation have become increasingly aware of and alarmed over the threat of a diminishing supply of usable water. Efficient and rapid reclamation of water for re-use is linked with the improvement of biological aerobic treatment methods to the point that they are capable of rapid renovation of enormous quantities of waste water. The most popular biological unit is the activated sludge system which employs a heterogeneous population of microorganisms to stabilize wastes. Many investigators have studied the activated sludge process with a pragmatic goal of improved design and treatment, but as van Gils states, few have been concerned with the fundamental nature of the purification process (1). Gaudy and Gaudy (2) indicate one approach to this problem by stating, "The challenging aspect to researchers in this field is the necessity of uncovering facts of predictive value for natural populations rather than for a single culture. " However, they add, "Ideally, pure culture studies may form useiul tools for the investigations of heterogeneous populations." Studies on the ability of pure cultures of activated sludge microorganisms to clarify sewage have been made by a number of investigators. Butterfield, et al., (3), Ruchhoft, et al., (4), and Buck and Keefer (5), employing zoogleal species isolated from activated sludge, found that BOD removal by pure cultures is similar to that attained with the mixed flora of whole sludge. However, other workers reported that no pure culture was able to clarify domestic wastes as efficiently as sewage-seeded sludge, although some species approach 90 per cent efficiency. When van Gils compared the oxidation of selected organic compounds by pure cultures and by whole sludge, he found that members of the genera Pseudomonas, Anhrobacter, Flavobacterium, and Zooglea give oxygen consumption curves similar to those of activated sludge (1). No work comparing whole sludge oxidation patterns with those of pure and mixed cultures, employing the ratios of microbial populations existing in an aeration tank has been reported. Knowledge of the effect of one species upon another species or group of species is fundamental to attaining the goal of the systems analyst, i. e., development of a picture of the activated sludge aeration tank environment as a predictable functioning ecosystem. Current investigations on the physiological ecology of activated sludge micro- - 78 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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