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38 THE IMPACT OF ALPHA ON THE FEASIBILITY OF FINE BUBBLE DIFFUSERS IN INDUSTRIAL WASTEWATER Kevin R. Flanders, Engineer Woodard & Curran Inc. Portland, Maine 04112 Robert Reich, Senior Consultant E.I. DuPont deNemours and Co., Inc. Wilmington, Delaware 19899 Louis E. Himelreich, Jr., Consultant Associate E.I. DuPont deNemours and Co. Deepwater, New Jersey 07802 Gary Gilbert Aeration Technologies, Inc. North Andover, Massachusett 01061 James W. Morris, Senior Consultant Woodard & Curran Inc. Portland, Maine 04112 Harry W. Heath HWH Consulting Wilmington, Delaware 19899 BACKGROUND The objective of this study was to determine the technical and economic feasibility of replacing the coarse bubble aeration system at the DuPont Chambers Works facility (Chambers Works) with fine bubble diffusers. The study included an onsite pilot study and extensive review and interpretation of the data. The pilot study evaluated the performance of four fine bubble diffusers and one coarse bubble diffuser. The four fine bubble diffusers were: a generic membrane tube (MT), commercial membrane disk (MD), commercial ceramic disk (CD), and commercial plastic tube (PT). Another diffuser was constructed to model the existing coarse bubble (CB) aeration system. Fine bubble diffusers often provide significantly higher oxygen transfer efficiency (OTE) values than coarse bubble diffusers. The fine bubble diffuser advantage lies in the much larger surface-to- volume ratio of fine bubbles as compared to coarse bubbles. This results in a more rapid movement of oxygen from a given mass of air across the gas-liquid interface, which is usually the rate limiting step in oxygen transfer. This advantage results in lower air-volume requirements, less blower power demand, and reduced energy costs. Because of this potential for significant energy costs savings, DuPont decided to test, under simulated field conditions, the comparative oxygen transfer efficiencies of the five aeration devices. The MT fine bubble diffuser consisted of a 2.5-inch diameter, 24-inch long, plastic pipe frame with a perforated elastomer membrane fastened over the pipe frame. The CD fine bubble diffuser consisted of a 9-inch diameter ceramic disc mounted on a rigid plastic frame. The MD fine bubble diffuser consisted of a 22-inch diameter plastic disk covered by a perforated elastomer membrane mounted on a rigid plastic frame. The PT fine bubble diffuser consisted of a 2.5-inch diameter, 24- inch long, rigid porous plastic cylindrical tube. The CB diffuser consisted of a 2.5-inch diameter, 24- inch long, plastic pipe with one orifice located at the bottom center of the diffuser. Test results allow the pounds of oxygen required to treat each pound of BOD5 loading experienced by the aeration tanks to be calculated, which lead to diffuser system sizing. This information was used in a life cycle cost analysis to determine the extent of cost savings, if any, that would result from replacing the existing coarse bubble aeration system with fine bubble diffusers. 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 343
Object Description
Purdue Identification Number | ETRIWC199438 |
Title | Impact of alpha on the feasibility of fine bubble diffusers in industrial wastewater |
Author |
Flanders, Kevin R. Reich, Robert Himelreich, Louis E. Gilbert, Gary Morris, James W. Heath, Harry W. |
Date of Original | 1994 |
Conference Title | Proceedings of the 49th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,44602 |
Extent of Original | p. 343-352 |
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 | 2009-12-10 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 343 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | 38 THE IMPACT OF ALPHA ON THE FEASIBILITY OF FINE BUBBLE DIFFUSERS IN INDUSTRIAL WASTEWATER Kevin R. Flanders, Engineer Woodard & Curran Inc. Portland, Maine 04112 Robert Reich, Senior Consultant E.I. DuPont deNemours and Co., Inc. Wilmington, Delaware 19899 Louis E. Himelreich, Jr., Consultant Associate E.I. DuPont deNemours and Co. Deepwater, New Jersey 07802 Gary Gilbert Aeration Technologies, Inc. North Andover, Massachusett 01061 James W. Morris, Senior Consultant Woodard & Curran Inc. Portland, Maine 04112 Harry W. Heath HWH Consulting Wilmington, Delaware 19899 BACKGROUND The objective of this study was to determine the technical and economic feasibility of replacing the coarse bubble aeration system at the DuPont Chambers Works facility (Chambers Works) with fine bubble diffusers. The study included an onsite pilot study and extensive review and interpretation of the data. The pilot study evaluated the performance of four fine bubble diffusers and one coarse bubble diffuser. The four fine bubble diffusers were: a generic membrane tube (MT), commercial membrane disk (MD), commercial ceramic disk (CD), and commercial plastic tube (PT). Another diffuser was constructed to model the existing coarse bubble (CB) aeration system. Fine bubble diffusers often provide significantly higher oxygen transfer efficiency (OTE) values than coarse bubble diffusers. The fine bubble diffuser advantage lies in the much larger surface-to- volume ratio of fine bubbles as compared to coarse bubbles. This results in a more rapid movement of oxygen from a given mass of air across the gas-liquid interface, which is usually the rate limiting step in oxygen transfer. This advantage results in lower air-volume requirements, less blower power demand, and reduced energy costs. Because of this potential for significant energy costs savings, DuPont decided to test, under simulated field conditions, the comparative oxygen transfer efficiencies of the five aeration devices. The MT fine bubble diffuser consisted of a 2.5-inch diameter, 24-inch long, plastic pipe frame with a perforated elastomer membrane fastened over the pipe frame. The CD fine bubble diffuser consisted of a 9-inch diameter ceramic disc mounted on a rigid plastic frame. The MD fine bubble diffuser consisted of a 22-inch diameter plastic disk covered by a perforated elastomer membrane mounted on a rigid plastic frame. The PT fine bubble diffuser consisted of a 2.5-inch diameter, 24- inch long, rigid porous plastic cylindrical tube. The CB diffuser consisted of a 2.5-inch diameter, 24- inch long, plastic pipe with one orifice located at the bottom center of the diffuser. Test results allow the pounds of oxygen required to treat each pound of BOD5 loading experienced by the aeration tanks to be calculated, which lead to diffuser system sizing. This information was used in a life cycle cost analysis to determine the extent of cost savings, if any, that would result from replacing the existing coarse bubble aeration system with fine bubble diffusers. 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 343 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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