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25 SYSTEMATIC APPROACH FOR THE SELECTION OF THE LEAST COST TREATMENT TECHNOLOGY FOR AQUEOUS ORGANIC HAZARDOUS AND INDUSTRIAL WASTES Bruce I. Dvorak, Graduate Research Assistant Desmond F. Lawler, Associate Professor Department of Civil Engineering University of Texas Austin, Texas 78712-1076 Darrell L. Jones, Staff Engineer Radian Corp. Austin, Texas 78720 Deborah A. Boadway, Project Engineer County Sanitation Districts of Los Angeles County Whittier, CA 90607 Gerald E. Speitel Jr., Assistant Professor Department of Civil Engineering University of Texas at Austin Austin, Texas 78712-1076 INTRODUCTION Environmental engineers frequently face difficult design decisions in selecting the proper technology for the treatment of waters contaminated with organic chemicals. The two most common treatment methods are air stripping and carbon adsorption. However, concerns about air pollution from stripping towers sometimes necessitates using gas phase controls. Therefore three treatment options are usually considered: air stripping alone, air stripping followed by gas phase adsorption, and liquid phase adsorption. In this research, a rational method for selection among these treatment options was investigated. Mathematical models have been used to draw generalizations concerning the choice among the options. Compounds selected for study were synthetic organic chemicals that had been found previously in places and levels sufficient to cause environmental concern. The compounds selected were benzene, chloroform, trichloroethene (TCE), dibromochloropropane (DBCP), phenol, 1,1-dichloroethane (1,1-DCA), methyl tertiary butyl ether (MTBE), and a hypothetical component (XXX). These compounds respresented a broad range of stripping and adsorption characteristics. A liquid flow rate of 1000 gpm (1.44 MGD) and an influent water temperature of 20°C was used. High concentration (typical of some leachate and industrial wastes) and low concentration (typical of contaminated groundwater) cases were studied. BACKGROUND AND DEVELOPMENT OF MATHEMATICAL MODELS Air Stripping The theories of gas transfer and of packed tower aeration are well known and are found in numerous places in the technical literature. Only a brief review of some pertinent equations and terminology is given. Henry's law describes the linear relationship between liquid and gas phase concentrations at equilibrium: CG = H C. (1) 46th Purdue Industrial Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 245
Object Description
Purdue Identification Number | ETRIWC199125 |
Title | Systematic approach for the selection of the least cost treatment technology for aqueous organic hazardous and industrial wastes |
Author |
Dvorak, Bruce I. Lawler, Desmond F. Jones, Darrell L. Boadway, Deborah A. Speitel, Gerald E. |
Date of Original | 1991 |
Conference Title | Proceedings of the 46th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,42649 |
Extent of Original | p. 245-254 |
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 | 2009-11-24 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 245 |
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 | 25 SYSTEMATIC APPROACH FOR THE SELECTION OF THE LEAST COST TREATMENT TECHNOLOGY FOR AQUEOUS ORGANIC HAZARDOUS AND INDUSTRIAL WASTES Bruce I. Dvorak, Graduate Research Assistant Desmond F. Lawler, Associate Professor Department of Civil Engineering University of Texas Austin, Texas 78712-1076 Darrell L. Jones, Staff Engineer Radian Corp. Austin, Texas 78720 Deborah A. Boadway, Project Engineer County Sanitation Districts of Los Angeles County Whittier, CA 90607 Gerald E. Speitel Jr., Assistant Professor Department of Civil Engineering University of Texas at Austin Austin, Texas 78712-1076 INTRODUCTION Environmental engineers frequently face difficult design decisions in selecting the proper technology for the treatment of waters contaminated with organic chemicals. The two most common treatment methods are air stripping and carbon adsorption. However, concerns about air pollution from stripping towers sometimes necessitates using gas phase controls. Therefore three treatment options are usually considered: air stripping alone, air stripping followed by gas phase adsorption, and liquid phase adsorption. In this research, a rational method for selection among these treatment options was investigated. Mathematical models have been used to draw generalizations concerning the choice among the options. Compounds selected for study were synthetic organic chemicals that had been found previously in places and levels sufficient to cause environmental concern. The compounds selected were benzene, chloroform, trichloroethene (TCE), dibromochloropropane (DBCP), phenol, 1,1-dichloroethane (1,1-DCA), methyl tertiary butyl ether (MTBE), and a hypothetical component (XXX). These compounds respresented a broad range of stripping and adsorption characteristics. A liquid flow rate of 1000 gpm (1.44 MGD) and an influent water temperature of 20°C was used. High concentration (typical of some leachate and industrial wastes) and low concentration (typical of contaminated groundwater) cases were studied. BACKGROUND AND DEVELOPMENT OF MATHEMATICAL MODELS Air Stripping The theories of gas transfer and of packed tower aeration are well known and are found in numerous places in the technical literature. Only a brief review of some pertinent equations and terminology is given. Henry's law describes the linear relationship between liquid and gas phase concentrations at equilibrium: CG = H C. (1) 46th Purdue Industrial Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, Michigan 48118. Printed in U.S.A. 245 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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