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Treatability of Leachate from Sanitary Landfills W. C. BOYLE R. K. HAM Department of Civil and Environmental Engineering The University of Wisconsin Madison, Wisconsin INTRODUCTION Before 1965 very few people were aware of the fact that water passing through refuse in a landfill would become highly contaminated. This water, hereafter termed leachate, was generally not a matter of concern because few cases were noted where leachate had caused harm to someone. With the recent popularity of environmental matters, however, the importance of leachate as a particularly undesirable aspect of solid waste disposal on land has risen to the point that disposal sites are usually chosen to minimize the hazard associated with leachate. Furthermore, it is not uncommon to hear of cases where sites which might otherwise give rise to leachate problems are being used, with the provision that any leachate generated is collected and disposed of in some harmless fashion. Implicit in this provision is the assumption that, once leachate has been collected, there are proven methods whereby it may be treated or safely sent into the environment. It appears that this assumption is not valid, however, for little information is in the literature on the subject and, in cases where leachate is being collected, treatment is non-existent or rudimentary due to the lack of a proven method. The purpose of the work described in this paper is to evaluate a variety of leachate treatment schemes, developing design and operating criteria for the most promising ones. Two general categories of treatment processes would be useful for leachate treatment: those which would be used if only leachate were to be treated, and those which could be used as pretreatment systems prior to final processing in a sewage treatment plant. The first category of processes would be suitable if leachate were being generated at a location remote from sanitary sewer service. The most useful processes in such a situation are those which can be operated with a minimum of supervision and are either inexpensive to construct or are readily moved from one site to the next. Processes considered for the second category, where access to a sewage treatment plant is available, should complement the removals obtained by the treatment plant, and should provide sufficient pretreatment to insure that the efficiency of sewage treatment is not impaired. The studies described in this paper were designed to evaluate in the laboratory the ability of a variety of individual treatment processes to treat leachate. Processes evaluated include anaerobic and aerobic biological treatment of leachate; aerobic treatment of selected combinations of leachate and domestic wastewater in a simulated activated sludge sewage treatment plant; anaerobic followed by aerobic polishing treatment of leachate; and chemical precipitation, oxidation, and coagulation. DESCRIPTION OF LEACHATE TREATED One of the most difficult aspects of a study involved with leachate treatment is attempting to define the characteristics of the leachate to be treated. The literature is beginning to provide descriptions of leachate collected under a variety of conditions in several places around the country. For example, Table I provides composition data for several leachates. Note the wide range in compositions observed in just these few examples, and the extremely high concentrations of chemically diverse contaminants which may be present. It is apparent that leachate quality varies so widely that attempts to define a typical composition must include such broad concentration ranges ofthe various contaminants as 687
Object Description
Purdue Identification Number | ETRIWC197263 |
Title | Treatability of leachate from sanitary landfills |
Author |
Boyle, William C. (William Charles), 1936- Ham, Robert K. |
Date of Original | 1972 |
Conference Title | Proceedings of the 27th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,20246 |
Extent of Original | p. 687-704 |
Series | Engineering extension series no. 141 |
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 | 2009-06-08 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page0687 |
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 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Treatability of Leachate from Sanitary Landfills W. C. BOYLE R. K. HAM Department of Civil and Environmental Engineering The University of Wisconsin Madison, Wisconsin INTRODUCTION Before 1965 very few people were aware of the fact that water passing through refuse in a landfill would become highly contaminated. This water, hereafter termed leachate, was generally not a matter of concern because few cases were noted where leachate had caused harm to someone. With the recent popularity of environmental matters, however, the importance of leachate as a particularly undesirable aspect of solid waste disposal on land has risen to the point that disposal sites are usually chosen to minimize the hazard associated with leachate. Furthermore, it is not uncommon to hear of cases where sites which might otherwise give rise to leachate problems are being used, with the provision that any leachate generated is collected and disposed of in some harmless fashion. Implicit in this provision is the assumption that, once leachate has been collected, there are proven methods whereby it may be treated or safely sent into the environment. It appears that this assumption is not valid, however, for little information is in the literature on the subject and, in cases where leachate is being collected, treatment is non-existent or rudimentary due to the lack of a proven method. The purpose of the work described in this paper is to evaluate a variety of leachate treatment schemes, developing design and operating criteria for the most promising ones. Two general categories of treatment processes would be useful for leachate treatment: those which would be used if only leachate were to be treated, and those which could be used as pretreatment systems prior to final processing in a sewage treatment plant. The first category of processes would be suitable if leachate were being generated at a location remote from sanitary sewer service. The most useful processes in such a situation are those which can be operated with a minimum of supervision and are either inexpensive to construct or are readily moved from one site to the next. Processes considered for the second category, where access to a sewage treatment plant is available, should complement the removals obtained by the treatment plant, and should provide sufficient pretreatment to insure that the efficiency of sewage treatment is not impaired. The studies described in this paper were designed to evaluate in the laboratory the ability of a variety of individual treatment processes to treat leachate. Processes evaluated include anaerobic and aerobic biological treatment of leachate; aerobic treatment of selected combinations of leachate and domestic wastewater in a simulated activated sludge sewage treatment plant; anaerobic followed by aerobic polishing treatment of leachate; and chemical precipitation, oxidation, and coagulation. DESCRIPTION OF LEACHATE TREATED One of the most difficult aspects of a study involved with leachate treatment is attempting to define the characteristics of the leachate to be treated. The literature is beginning to provide descriptions of leachate collected under a variety of conditions in several places around the country. For example, Table I provides composition data for several leachates. Note the wide range in compositions observed in just these few examples, and the extremely high concentrations of chemically diverse contaminants which may be present. It is apparent that leachate quality varies so widely that attempts to define a typical composition must include such broad concentration ranges ofthe various contaminants as 687 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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