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32 AQUEOUS PYROLYSIS OF INDUSTRIAL WASTES David L. Kincannon, Graduate Student Don F. Kincannon, Professor School of Civil Engineering William L. Hughes, Professor and Director The Engineering Energy Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater, Oklahoma 74078 INTRODUCTION Industrial wastes present many problems with regard to their disposal or treatment. Improper handling of industrial wastes can lead to pollution problems and public health hazards. Large quantities of industrial wastes are generated continuously which must have adequate treatment facilities or available space for disposal. Solid waste disposal in approved sanitary landfills can require large areas of land. If the industrial waste is a hazardous material, it must be disposed of in a permitted hazardous waste landfill. The land for these landfills must consist of a suitable soil type and an acceptable location that is near the source of waste generation and not in a place that is susceptible to flooding. Public opposition is usually great because nobody wants to have disposal or treatment facilities for wastes located in their vicinity. The opposition is due to the risks of pollution and the possibilities of unpleasant aesthetics and odor problems. This paper presents an investigation into the use of the aqueous pyrolysis method using induction heating that has been developed by Dr. William L. Hughes and co-workers (1) as a method of treating industrial wastes and other solid wastes. PREVIOUS WORK Research previously done on pyrolysis has provided helpful information in several areas. Hughes and Ramakumar [1] used aqueous pyrolysis of biomass as a method for generating energy using various biomass waste products as the sources of fuel. They found that the process yielded a gaseous product nearly evenly divided between carbon dioxide and combustible hydrocarbon gases. Their process used induction heating of a batch reactor to pyrolyze cotton, saw dust, newsprint, coal dust, and plant materials [1]. Bohn and Benham [2] in their study of biomass pyrolysis using an entrained flow tubular reactor of a wheat straw feedstock with a steam carrier gas measured the gas yield, gas composition, and process heat of the pyrolysis process. Gas yields of 91% were measured at 950°C, and the process heat was measured in the range of 2300-3000 J/g of pyrolysis gas. The composition of gases was found to be 52% CO, 20% H2, 11 % methane, 8% C02, 5% ethylene, and 4% other gases. This study showed that the pyrolysis was strongly influenced by the reactor temperature and not by the steam to biomass ratio [21- Kemmler and Schlich [3] investigated the use of pyrolysis for the volume reduction of organic wastes. The process was used for pyrolyzing nuclear wastes and spent solvents. The volume reduction of nuclear wastes was 50% and mass reduction was 20%. There was a 7% reduction of volume and nearly 6% reduction of mass of the solvent that was pyrolyzed [3]. PROCESS DESCRIPTION Aqueous pyrolysis is the conversion of a sample mixed with water into another substance or substances by subjecting the material to high temperature and high pressure [4]. The water is used to replace air in void spaces of the material. Due to thermal fission, the process generally leads to the production of molecules of lower mass. The process results in the decomposition of the material into char, carbon dioxide, methane, and other hydrocarbon gases such as ethane and ethylene. The 293
Object Description
Purdue Identification Number | ETRIWC198632 |
Title | Aqueous pyrolysis of industrial wastes |
Author |
Kincannon, David L. Kincannon, Don F. Hughes, William L. |
Date of Original | 1986 |
Conference Title | Proceedings of the 41st Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,37786 |
Extent of Original | p. 293-302 |
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 | 2009-07-13 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 293 |
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 | 32 AQUEOUS PYROLYSIS OF INDUSTRIAL WASTES David L. Kincannon, Graduate Student Don F. Kincannon, Professor School of Civil Engineering William L. Hughes, Professor and Director The Engineering Energy Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater, Oklahoma 74078 INTRODUCTION Industrial wastes present many problems with regard to their disposal or treatment. Improper handling of industrial wastes can lead to pollution problems and public health hazards. Large quantities of industrial wastes are generated continuously which must have adequate treatment facilities or available space for disposal. Solid waste disposal in approved sanitary landfills can require large areas of land. If the industrial waste is a hazardous material, it must be disposed of in a permitted hazardous waste landfill. The land for these landfills must consist of a suitable soil type and an acceptable location that is near the source of waste generation and not in a place that is susceptible to flooding. Public opposition is usually great because nobody wants to have disposal or treatment facilities for wastes located in their vicinity. The opposition is due to the risks of pollution and the possibilities of unpleasant aesthetics and odor problems. This paper presents an investigation into the use of the aqueous pyrolysis method using induction heating that has been developed by Dr. William L. Hughes and co-workers (1) as a method of treating industrial wastes and other solid wastes. PREVIOUS WORK Research previously done on pyrolysis has provided helpful information in several areas. Hughes and Ramakumar [1] used aqueous pyrolysis of biomass as a method for generating energy using various biomass waste products as the sources of fuel. They found that the process yielded a gaseous product nearly evenly divided between carbon dioxide and combustible hydrocarbon gases. Their process used induction heating of a batch reactor to pyrolyze cotton, saw dust, newsprint, coal dust, and plant materials [1]. Bohn and Benham [2] in their study of biomass pyrolysis using an entrained flow tubular reactor of a wheat straw feedstock with a steam carrier gas measured the gas yield, gas composition, and process heat of the pyrolysis process. Gas yields of 91% were measured at 950°C, and the process heat was measured in the range of 2300-3000 J/g of pyrolysis gas. The composition of gases was found to be 52% CO, 20% H2, 11 % methane, 8% C02, 5% ethylene, and 4% other gases. This study showed that the pyrolysis was strongly influenced by the reactor temperature and not by the steam to biomass ratio [21- Kemmler and Schlich [3] investigated the use of pyrolysis for the volume reduction of organic wastes. The process was used for pyrolyzing nuclear wastes and spent solvents. The volume reduction of nuclear wastes was 50% and mass reduction was 20%. There was a 7% reduction of volume and nearly 6% reduction of mass of the solvent that was pyrolyzed [3]. PROCESS DESCRIPTION Aqueous pyrolysis is the conversion of a sample mixed with water into another substance or substances by subjecting the material to high temperature and high pressure [4]. The water is used to replace air in void spaces of the material. Due to thermal fission, the process generally leads to the production of molecules of lower mass. The process results in the decomposition of the material into char, carbon dioxide, methane, and other hydrocarbon gases such as ethane and ethylene. The 293 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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