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30 ANAEROBIC SEQUENCING BATCH REACTOR TREATMENT OF LANDFILL LEACHATE Jake A. Hollopeter, Staff Engineer Gray & Osborne, Inc. Yakima, Washington 98901 Richard R. Dague, Professor of Environmental Engineering Department of Civil Engineering Iowa State University Ames, Iowa 50011 INTRODUCTION Sanitary landfills have been the primary dumping ground for municipal solid waste for many years. Even today, when concerns over environmental protection are at the forefront of world politics, recent studies indicate that the majority of municipal solid waste generated in the U.S. is still ultimately disposed of in the sanitary landfill.1 Landfill disposal of municipal solid wastes has continued to be popular because it is one of the simplest and most economical disposal methods available. The use of the sanitary landfill also minimizes adverse environmental effects and other risks and inconveniences, and allows waste to decompose under controlled conditions until its eventual transformation into relatively inert, stabilized material.2 Although the sanitary landfill is the most popular method of solid waste disposal, there are certain environmental hazards associated with landfilling that must be controlled. One of the major hazards is the possible contamination of neighboring surface and/or groundwaters by migrating leachate. In order to prevent the migration of leachate, leachate collection systems, including impermeable liners and drainage pipes, have been developed by the U. S. Environmental Protection Agency and are implemented in today's landfill designs. However, even though it is possible to prevent leachate migration, it is impossible to prevent leachate production, and all of the leachate that is produced at a landfill site must be treated in a safe and effective manner. Leachates are liquid wastes produced at all landfill sites as water percolates through the refuse and leaches out an assortment of organic and inorganic constituents. The characteristics of the leachate produced from a sanitary landfill can vary widely in quantity and composition from site to site and seasonally at each landfill. The factors controlling the composition of the leachate include the degree of compaction and composition of the solid waste, particle size, the hydrology of the site, the climate, and the age of the landfill.3 The possibility of substantial concentrations of organic materials and various soluble metals, as well as the high level of volume and strength variability, make the treatment of most leachates much more difficult than the treatment of municipal wastewater. Treatment technologies for landfill leachate are relatively young. Evaluation of various leachate treatment processes was first conducted by Boyle and Ham4 in 1974. This research provided a foundation for further development in the area of leachate treatment. Since those initial studies, the methods available for the treatment of leachates have expanded dramatically. Table 1 classifies a variety of alternatives available for the partial or total treatment of landfill leachates.2 Landfill leachates are generally well suited to anaerobic treatment due to the amount of volatile fatty acids found in them. It is these readily degradable acids that account for the bulk of the chemical oxygen demand of many leachates which make them amenable to anaerobic treatment.5 However, the variability of the leachate from site to site can create problems in selecting an adequate treatment method. What may be a successful treatment method at one site may not work well at another location. Extensive testing must be conducted to ensure that the best treatment method is selected for each particular leachate. This research was conducted in two phases and focused on treating municipal landfill leachate using the ASBR at a constant temperature of 35°C. The ASBR is a new high-rate anaerobic treatment 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 277
Object Description
Purdue Identification Number | ETRIWC199430 |
Title | Anaerobic sequencing batch reactor treatment of landfill leachate |
Author |
Hollopeter, Jake A. Dague, Richard R. |
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. 277-284 |
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 277 |
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 | 30 ANAEROBIC SEQUENCING BATCH REACTOR TREATMENT OF LANDFILL LEACHATE Jake A. Hollopeter, Staff Engineer Gray & Osborne, Inc. Yakima, Washington 98901 Richard R. Dague, Professor of Environmental Engineering Department of Civil Engineering Iowa State University Ames, Iowa 50011 INTRODUCTION Sanitary landfills have been the primary dumping ground for municipal solid waste for many years. Even today, when concerns over environmental protection are at the forefront of world politics, recent studies indicate that the majority of municipal solid waste generated in the U.S. is still ultimately disposed of in the sanitary landfill.1 Landfill disposal of municipal solid wastes has continued to be popular because it is one of the simplest and most economical disposal methods available. The use of the sanitary landfill also minimizes adverse environmental effects and other risks and inconveniences, and allows waste to decompose under controlled conditions until its eventual transformation into relatively inert, stabilized material.2 Although the sanitary landfill is the most popular method of solid waste disposal, there are certain environmental hazards associated with landfilling that must be controlled. One of the major hazards is the possible contamination of neighboring surface and/or groundwaters by migrating leachate. In order to prevent the migration of leachate, leachate collection systems, including impermeable liners and drainage pipes, have been developed by the U. S. Environmental Protection Agency and are implemented in today's landfill designs. However, even though it is possible to prevent leachate migration, it is impossible to prevent leachate production, and all of the leachate that is produced at a landfill site must be treated in a safe and effective manner. Leachates are liquid wastes produced at all landfill sites as water percolates through the refuse and leaches out an assortment of organic and inorganic constituents. The characteristics of the leachate produced from a sanitary landfill can vary widely in quantity and composition from site to site and seasonally at each landfill. The factors controlling the composition of the leachate include the degree of compaction and composition of the solid waste, particle size, the hydrology of the site, the climate, and the age of the landfill.3 The possibility of substantial concentrations of organic materials and various soluble metals, as well as the high level of volume and strength variability, make the treatment of most leachates much more difficult than the treatment of municipal wastewater. Treatment technologies for landfill leachate are relatively young. Evaluation of various leachate treatment processes was first conducted by Boyle and Ham4 in 1974. This research provided a foundation for further development in the area of leachate treatment. Since those initial studies, the methods available for the treatment of leachates have expanded dramatically. Table 1 classifies a variety of alternatives available for the partial or total treatment of landfill leachates.2 Landfill leachates are generally well suited to anaerobic treatment due to the amount of volatile fatty acids found in them. It is these readily degradable acids that account for the bulk of the chemical oxygen demand of many leachates which make them amenable to anaerobic treatment.5 However, the variability of the leachate from site to site can create problems in selecting an adequate treatment method. What may be a successful treatment method at one site may not work well at another location. Extensive testing must be conducted to ensure that the best treatment method is selected for each particular leachate. This research was conducted in two phases and focused on treating municipal landfill leachate using the ASBR at a constant temperature of 35°C. The ASBR is a new high-rate anaerobic treatment 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 277 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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