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BIOLOGICAL TREATABILITY STUDY OF WASTEWATER FROM A NYLON FIBERS AND PLASTICS FACILITY Gregory A. Anderson, Laboratory Director Rivanna Water and Sewer Authority Charlottesville, Virginia 22903 Gregory D. Boardman, Assistant Professor Department of Civil Engineering David A. Wallis, Assistant Professor Department of Chemical Engineering Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061 INTRODUCTION Allied Corporation's fiber plant at Chesterfield, Virginia, is one of the world's largest producers of Nylon-6. Nylon-6 refers to a polymeric material, that is manufactured from caprolactam, a cyclic amide of six carbon atoms, nine hydrogen atoms, and one nitrogen atom. The wastewater generated at the plant contains rather high levels of organic nitrogen due to the presence of caprolactam, and is presently handled in a treatment train consisting of three holding ponds and a land application system. The objective of the work described in this paper was to investigate the feasibility of reducing nitrogen levels in the wastewater by using aerobic, biological treatment, thereby increasing the life of the land application system. There is information in the literature which indicates that caprolactam can inhibit the growth of microorganisms [1-6]. Also, it has been reported that nitrification is repressed at caprolactam levels in the area of 100 to 1000 mg/l [6]. At the lower end of the range the process is slightly inhibited, while at the higher caprolactam levels, virtually no nitrate and little nitrite form. These concepts were important to consider because if caprolactam levels in the influent streams to the biological reactors of this study were too high, the treatment processes could be inhibited. In addition, to accomplish the goals of this study it was necessary to minimize nitrification so that the release of nitrogen from the wastewater in the form of ammonia volatilized could be maximized. Others who have studied the biodegradation of caprolactam in aerobic environments have reported that the compound was most rapidly degraded at pH levels in the aera of 6 to 8.6, and at temperatures in the area of 33 to 42 C [4,7-10]. Pitter [11] and Livke et al [12] reported that greater than 90% of the chemical oxygen demand and biochemical oxygen demand could be removed from caprolactam-containing wastewaters under aerobic conditions. Therefore, some information in the literature indicates wastewaters containing caprolactam can be treated effectively by means of aerobic biological processes. This information is rather limited in its usefulness because many of the experiments described were conducted with pure or stream populations of bacteria, and at levels of caprolactam much lower than those used in this study. The wastewater considered herein probably contained about 10,000 mg/l of caprolactam. METHODS AND MATERIALS This study was conducted in two phases. In the first phase a series of aerobic batch experiments were performed. In the second phase of the work, aerobic continuous-flow reactors were studied. The wastewater used in all of the studies was obtained from the storage ponds at the Allied facility and 201
Object Description
Purdue Identification Number | ETRIWC198322 |
Title | Biological treatability study of wastewater from a nylon fibers and plastics facility |
Author |
Anderson, Gregory A. Boardman, Gregory D. Wallis, David A. |
Date of Original | 1983 |
Conference Title | Proceedings of the 38th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,34749 |
Extent of Original | p. 201-210 |
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 | 2009-07-28 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 201 |
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 | BIOLOGICAL TREATABILITY STUDY OF WASTEWATER FROM A NYLON FIBERS AND PLASTICS FACILITY Gregory A. Anderson, Laboratory Director Rivanna Water and Sewer Authority Charlottesville, Virginia 22903 Gregory D. Boardman, Assistant Professor Department of Civil Engineering David A. Wallis, Assistant Professor Department of Chemical Engineering Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061 INTRODUCTION Allied Corporation's fiber plant at Chesterfield, Virginia, is one of the world's largest producers of Nylon-6. Nylon-6 refers to a polymeric material, that is manufactured from caprolactam, a cyclic amide of six carbon atoms, nine hydrogen atoms, and one nitrogen atom. The wastewater generated at the plant contains rather high levels of organic nitrogen due to the presence of caprolactam, and is presently handled in a treatment train consisting of three holding ponds and a land application system. The objective of the work described in this paper was to investigate the feasibility of reducing nitrogen levels in the wastewater by using aerobic, biological treatment, thereby increasing the life of the land application system. There is information in the literature which indicates that caprolactam can inhibit the growth of microorganisms [1-6]. Also, it has been reported that nitrification is repressed at caprolactam levels in the area of 100 to 1000 mg/l [6]. At the lower end of the range the process is slightly inhibited, while at the higher caprolactam levels, virtually no nitrate and little nitrite form. These concepts were important to consider because if caprolactam levels in the influent streams to the biological reactors of this study were too high, the treatment processes could be inhibited. In addition, to accomplish the goals of this study it was necessary to minimize nitrification so that the release of nitrogen from the wastewater in the form of ammonia volatilized could be maximized. Others who have studied the biodegradation of caprolactam in aerobic environments have reported that the compound was most rapidly degraded at pH levels in the aera of 6 to 8.6, and at temperatures in the area of 33 to 42 C [4,7-10]. Pitter [11] and Livke et al [12] reported that greater than 90% of the chemical oxygen demand and biochemical oxygen demand could be removed from caprolactam-containing wastewaters under aerobic conditions. Therefore, some information in the literature indicates wastewaters containing caprolactam can be treated effectively by means of aerobic biological processes. This information is rather limited in its usefulness because many of the experiments described were conducted with pure or stream populations of bacteria, and at levels of caprolactam much lower than those used in this study. The wastewater considered herein probably contained about 10,000 mg/l of caprolactam. METHODS AND MATERIALS This study was conducted in two phases. In the first phase a series of aerobic batch experiments were performed. In the second phase of the work, aerobic continuous-flow reactors were studied. The wastewater used in all of the studies was obtained from the storage ponds at the Allied facility and 201 |
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