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Kinetics of Removal of Soluble B.O.D.
by Activated Sludge*
M. TRUETT GARRETT, JR.
Vice-President
Garrett Engineering Company, Houston, Texas
CLAIR N. SAWYER
Associate Professor of Sanitary
Chemistry, Massachusetts Institute of Technology
The activated sludge process has been used under varied conditions
to give results ranging from complete treatment with conventional operation to partial treatment with plain aeration. However, a means of
correlating and explaining the results obtained under the various conditions of operation has not been definitely determined.
It is apparent from the equipment used that there are two functions involved in the process. These are:
1. The incorporation of the B.O.D. into the sludge
floes in an aeration unit, and
2. The separation of the sludge floes from the carriage water in a sedimentation unit.
The purpose of the laboratory studies with which this paper is concerned was to determine the kinetics of the first function using soluble
substrates. The removal of soluble B.O.D. is defined as the disappearance of B.O.D from solution. Since the sludge particles have a B.O.D.,
the remaining soluble B.O.D. can be measured only after the complete
removal of the insoluble sludge particles, including individual bacteria.
A direct relation between the removal of B.O.D. and the growth of
sludge solids has been frequently reported, Placak and Ruchhoft (1)
found that when various pure substances were fed to activated sludge 10
to 85 per cent of the weight of the substance was converted into protoplasm. Helmers et el. (2) observed that the increase in sludge solids was
proportional to the B.O.D. reduction of the waste. The relationship
was apparently independent of the nature of the waste since similar
results were obtained for cotton kiering waste, rag-rope pulping waste,
brewery waste, glucose, and peptone. Heukelekian et al. (3) found
that a similar relationship applied to domestic sewage.
* A contribution from the Sedgwick Memorial Laboratories, Massachusetts
Institute of Technology, Cambridge, Mass.
51
Object Description
| Purdue Identification Number | ETRIWC195207 |
| Title | Kinetics of removal of soluble B.O.D. by activated sludge |
| Author |
Garrett, M. Truett Sawyer, Clair N. |
| Date of Original | 1952 |
| Conference Title | Proceedings of the seventh Industrial Waste Conference |
| Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/cdm4/document.php?CISOROOT=/engext&CISOPTR=2072&REC=5 |
| Extent of Original | p. 51-77 |
| 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 | 2008-11-13 |
| Capture Device | Fujitsu fi-5650C |
| Capture Details | ScandAll 21 |
| Resolution | 300 ppi |
| Color Depth | 8 bit |
Description
| Title | page 51 |
| 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 | Kinetics of Removal of Soluble B.O.D. by Activated Sludge* M. TRUETT GARRETT, JR. Vice-President Garrett Engineering Company, Houston, Texas CLAIR N. SAWYER Associate Professor of Sanitary Chemistry, Massachusetts Institute of Technology The activated sludge process has been used under varied conditions to give results ranging from complete treatment with conventional operation to partial treatment with plain aeration. However, a means of correlating and explaining the results obtained under the various conditions of operation has not been definitely determined. It is apparent from the equipment used that there are two functions involved in the process. These are: 1. The incorporation of the B.O.D. into the sludge floes in an aeration unit, and 2. The separation of the sludge floes from the carriage water in a sedimentation unit. The purpose of the laboratory studies with which this paper is concerned was to determine the kinetics of the first function using soluble substrates. The removal of soluble B.O.D. is defined as the disappearance of B.O.D from solution. Since the sludge particles have a B.O.D., the remaining soluble B.O.D. can be measured only after the complete removal of the insoluble sludge particles, including individual bacteria. A direct relation between the removal of B.O.D. and the growth of sludge solids has been frequently reported, Placak and Ruchhoft (1) found that when various pure substances were fed to activated sludge 10 to 85 per cent of the weight of the substance was converted into protoplasm. Helmers et el. (2) observed that the increase in sludge solids was proportional to the B.O.D. reduction of the waste. The relationship was apparently independent of the nature of the waste since similar results were obtained for cotton kiering waste, rag-rope pulping waste, brewery waste, glucose, and peptone. Heukelekian et al. (3) found that a similar relationship applied to domestic sewage. * A contribution from the Sedgwick Memorial Laboratories, Massachusetts Institute of Technology, Cambridge, Mass. 51 |
| Resolution | 300 ppi |
| Color Depth | 8 bit |
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