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12 EVALUATION OF CARBON IMPREGNATED POLYURETHANE FOAM MEDIA FOR BIOLOGICAL REMOVAL OF CARBON AND NITROGEN FROM CHEMICAL INDUSTRY WASTEWATER Silas W. Givens, Project Engineer Industrial Processes and Hazardous Wastes CH2M HILL Atlanta, Georgia 30303 William A. Sack, Professor Department of Civil Engineering West Virginia University Morgantown, West Virginia 26506 INTRODUCTION In attempts to upgrade the activated sludge process, use of porous biomass support systems have been employed to support microorganisms allowing a significant increase in biomass concentration. These systems use large numbers of open celled polyurethane foam pads to support microorganisms. The pad pore structure is such that substrate and oxygen pass through the pad with the establishment of a differential velocity between the pads and the bulk liquid. Porous biomass support systems (PBSS) have been in the developmental stages for a number of years and are considered one of the emerging innovative and alternative (1/A) wastewater treatment technologies by the U.S. EPA.' However, operational data is limited and little if any data is available on the use of PBSS for the treatment of priority pollutants or for other advanced wastewater treatment applications. This laboratory study was undertaken to evaluate the performance of a PBSS utilizing a carbon impregnated polyurethane foam pad for removal of priority pollutants and nitrogen. The addition of activated carbon to the polyurethane pads is a unique modification of PBSS technology which is believed to be advantageous for the treatment of toxic and inhibitory wastewater for both priority pollutant and nitrogen removal. BACKGROUND The PBSS technology has been developed independently in the United Kingdom and West Germany over a period of approximately 9 years. In the United Kingdom, researchers at the University of Manchester Institute of Science and Technology developed what is now commercially marketed as the Captor Process by Simon-Hartley, Ltd. In West Germany, Linde AG has developed what is known as the Linpor Process. Both the Captor and Linpor processes use polyurethane foam pads within the aeration basin; however, the processes differ in both pad size and operational configuration.' Captor Process The Captor process utilizes polyurethane pads of the approximate dimensions 25 mm x 25 mm x 12.5 mm. Normal basin pad concentration is 40,000 per m3, or a volume concentration of 31%.' Because of the microorganisms ability to colonize surfaces, the pads become loaded with biomass to a level which is a function of the strength of the wastewater. Typically, 60 to 300 mg of biomass per pad are encountered which yields an "equivalent" mixed liquor suspended solids (MLSS) concentration (neglecting non-pad solids) of 1860 to 9300 mg/L at a basin pad concentration of 31 pads/L.' The "free" MLSS concentrations are intended to be negligible in the Captor process, thereby eliminating 93
Object Description
Purdue Identification Number | ETRIWC198712 |
Title | Evaluation of carbon impregnated polyurethane foam media for biological removal of carbon and nitrogen from chemical industry wastewater |
Author |
Givens, Silas Sack, William A. |
Date of Original | 1987 |
Conference Title | Proceedings of the 42nd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,38818 |
Extent of Original | p. 93-102 |
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 | 2009-08-03 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 93 |
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 | 12 EVALUATION OF CARBON IMPREGNATED POLYURETHANE FOAM MEDIA FOR BIOLOGICAL REMOVAL OF CARBON AND NITROGEN FROM CHEMICAL INDUSTRY WASTEWATER Silas W. Givens, Project Engineer Industrial Processes and Hazardous Wastes CH2M HILL Atlanta, Georgia 30303 William A. Sack, Professor Department of Civil Engineering West Virginia University Morgantown, West Virginia 26506 INTRODUCTION In attempts to upgrade the activated sludge process, use of porous biomass support systems have been employed to support microorganisms allowing a significant increase in biomass concentration. These systems use large numbers of open celled polyurethane foam pads to support microorganisms. The pad pore structure is such that substrate and oxygen pass through the pad with the establishment of a differential velocity between the pads and the bulk liquid. Porous biomass support systems (PBSS) have been in the developmental stages for a number of years and are considered one of the emerging innovative and alternative (1/A) wastewater treatment technologies by the U.S. EPA.' However, operational data is limited and little if any data is available on the use of PBSS for the treatment of priority pollutants or for other advanced wastewater treatment applications. This laboratory study was undertaken to evaluate the performance of a PBSS utilizing a carbon impregnated polyurethane foam pad for removal of priority pollutants and nitrogen. The addition of activated carbon to the polyurethane pads is a unique modification of PBSS technology which is believed to be advantageous for the treatment of toxic and inhibitory wastewater for both priority pollutant and nitrogen removal. BACKGROUND The PBSS technology has been developed independently in the United Kingdom and West Germany over a period of approximately 9 years. In the United Kingdom, researchers at the University of Manchester Institute of Science and Technology developed what is now commercially marketed as the Captor Process by Simon-Hartley, Ltd. In West Germany, Linde AG has developed what is known as the Linpor Process. Both the Captor and Linpor processes use polyurethane foam pads within the aeration basin; however, the processes differ in both pad size and operational configuration.' Captor Process The Captor process utilizes polyurethane pads of the approximate dimensions 25 mm x 25 mm x 12.5 mm. Normal basin pad concentration is 40,000 per m3, or a volume concentration of 31%.' Because of the microorganisms ability to colonize surfaces, the pads become loaded with biomass to a level which is a function of the strength of the wastewater. Typically, 60 to 300 mg of biomass per pad are encountered which yields an "equivalent" mixed liquor suspended solids (MLSS) concentration (neglecting non-pad solids) of 1860 to 9300 mg/L at a basin pad concentration of 31 pads/L.' The "free" MLSS concentrations are intended to be negligible in the Captor process, thereby eliminating 93 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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