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Diffused Air in Deep Tank Aeration FRANK L. SCHMIT, Executive Vice President PAUL M. THAYER, Vice President of Engineering SANITAIRE — Water Pollution Control Corporation Milwaukee, Wisconsin 53201 DAVID T. REDMON, Engineer Ewing Engineering Company Milwaukee, Wisconsin 53209 INTRODUCTION Present day requirements for higher degrees of treatment, coupled with high land, construction, and power costs, have stimulated interest in the possible economies of deeper aeration tanks and higher loadings. The purpose of this study was to determine the relationship between water depth, tank width, and oxygen transfer rates to oxygen transfer efficiencies and power requirements. An earlier study by Schmit and Redmon (1) considered the effect of water depth. The objective of this investigation is to provide useful information for treatment plant design. DESCRIPTION OF FACILITY The testing facility is a steel tank 34'-4" wide by 6'-0" long by 24'-0" deep. Temporary baffles as shown in Figure 1 permit evaluation of two tank widths. SANITAIRE Model D- 24 diffusers were placed to extend 2'-0" on both sides of a header at mid-width of the tank, 2'-0" from the bottom. The tank is located adjacent to the SANITAIRE-Water Pollution Control Corp. office in Glendale, Wisconsin. Water is taken from the Glendale Water System, the source of which is Lake Michigan. Air is supplied by a rotary-positive blower driven with a 20 HP 1,750 rpm motor by means of v-belts. Air volume is controlled by changing motor or blower sheaves, with fine adjustment through a bleed valve. Air pressure is measured by a mercury column. Air volume is measured by an orifice type flow meter. Temperature is measured by a thermometer in a well located just ahead of the orifice plate. Sampling points are shown in Figure 1. Each sampling point consisted of an anti-air entrainment collector connected to a rotameter by means of equal length tubing. Laboratory tests indicated agreement with Miller (2) that the anti-entrainment device was necessary. For some tests, four samples were taken; for others, sample points were manifolded and one composite sample was taken. Sample points used for various tank widths and depths are indicated in Table I. LABORATORY PROCEDURES These tests utilized the non-steady state procedure generally described by Eckenfelder 576
Object Description
Purdue Identification Number | ETRIWC1975049 |
Title | Diffused air in deep tank aeration |
Author |
Schmit, Frank L. Thayer, Paul M. Redmon, David T. |
Date of Original | 1975 |
Conference Title | Proceedings of the 30th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,25691 |
Extent of Original | p. 576-589 |
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 | 2009-06-29 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page576 |
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 | Diffused Air in Deep Tank Aeration FRANK L. SCHMIT, Executive Vice President PAUL M. THAYER, Vice President of Engineering SANITAIRE — Water Pollution Control Corporation Milwaukee, Wisconsin 53201 DAVID T. REDMON, Engineer Ewing Engineering Company Milwaukee, Wisconsin 53209 INTRODUCTION Present day requirements for higher degrees of treatment, coupled with high land, construction, and power costs, have stimulated interest in the possible economies of deeper aeration tanks and higher loadings. The purpose of this study was to determine the relationship between water depth, tank width, and oxygen transfer rates to oxygen transfer efficiencies and power requirements. An earlier study by Schmit and Redmon (1) considered the effect of water depth. The objective of this investigation is to provide useful information for treatment plant design. DESCRIPTION OF FACILITY The testing facility is a steel tank 34'-4" wide by 6'-0" long by 24'-0" deep. Temporary baffles as shown in Figure 1 permit evaluation of two tank widths. SANITAIRE Model D- 24 diffusers were placed to extend 2'-0" on both sides of a header at mid-width of the tank, 2'-0" from the bottom. The tank is located adjacent to the SANITAIRE-Water Pollution Control Corp. office in Glendale, Wisconsin. Water is taken from the Glendale Water System, the source of which is Lake Michigan. Air is supplied by a rotary-positive blower driven with a 20 HP 1,750 rpm motor by means of v-belts. Air volume is controlled by changing motor or blower sheaves, with fine adjustment through a bleed valve. Air pressure is measured by a mercury column. Air volume is measured by an orifice type flow meter. Temperature is measured by a thermometer in a well located just ahead of the orifice plate. Sampling points are shown in Figure 1. Each sampling point consisted of an anti-air entrainment collector connected to a rotameter by means of equal length tubing. Laboratory tests indicated agreement with Miller (2) that the anti-entrainment device was necessary. For some tests, four samples were taken; for others, sample points were manifolded and one composite sample was taken. Sample points used for various tank widths and depths are indicated in Table I. LABORATORY PROCEDURES These tests utilized the non-steady state procedure generally described by Eckenfelder 576 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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