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74 TREATABILITY STUDY OF HIGH STRENGTH LANDFILL LEACHATE Anthony F. Gaudy, Jr., Professor Alan F. Rozich, Associate Scientist Stephanie Garniewski, Graduate Student Department of Civil Engineering University of Delaware Newark, Delaware 19716 INTRODUCTION The sanitary landfill was devised over four decades ago as a relatively inexpensive, hygienic way to bury solid refuse rather than continue the then prevalent practice of open dumping. At the time little consideration was given to the potential for groundwater pollution. The landfill is an attractive technology because, in addition to its simplicity and relatively low cost, it is an ultimate method of disposal (as, for example, compared to incineration of municipal refuse). As the use of this technique grew, there was increasing concern over pollution of groundwater by organic materials leached from the municipal refuse and, since many municipalities accepted industrial wastes as well as municipal refuse, there was increasing concern over the possibilities for entry of hazardous waste components into the groundwater resource. Today, mounting evidence for groundwater contamination mandates that modern landfill design provide means for containing all seepage, or leachate, from the fill. The sanitary landfill operated at Sandtown, Delaware, by the Delaware Solid Waste Authority is a state-of-the-art facility in which leachate is collected and held on the site, but as yet there is no provision for its treatment. The facility accepts solid industrial wastes as well as municipal refuse. The operational and managerial strategies for the facility are presented elsewhere [1]. Approximately 25,000-30,000 gallons of leachate are produced daily. Its BOD5 is approximately 100 times higher than that of municipal sewage and it contains significant amounts of heavy metals. Since the amenability of municipal landfill leachate to aerobic biological treatment has been rather widely reported and, since some of the work recently reported from our bio-environmental engineering laboratories has dealt with biological treatment of waste containing heavy metals [2,3] and inhibitory and toxic compounds [4,5,6,7] as well as conventional pollutants, the Delaware Solid Waste Authority approached us to discuss the possibilities for investigating the biological treatment of the Sandtown site leachate. Our task was essentially three-fold. There was need for additional information on the chemical characteristics of the leachate. The Authority, from time to time, had obtained BOD, COD, and metals analyses on the waste, as well as analyses for volatile acids concentrations, but a more systematic program of sampling and analysis was needed to gain some idea of the variations in composition which might be expected, as well as the average values. Since it is widely known that leachate composition varies from site to site, it is equally well- recognized that the amenability of the leachate to biological treatment can also vary. Thus, it was important to perform a treatability investigation on the leachate over a period of time sufficient to allow assessment of the biochemical response to variations which might occur in the waste composition. One of the best approaches to treatability studies which we have found is to determine values of the biokinetic parameters which govern the process. These are also the kinetic characteristics needed for insertion into kinetic models for prediction of performance and of the effects of variation in engineering control parameters on system performance. That is, the study should include the determination of the following biokinetic "constants": ^max, the maximum specific growth rate; Ks, the saturation constant; K,, the inhibition constant; kd, the specific decay rate; Yt, the true cell yield; and ka, the autodigestion constant. In our view, such studies require the running of both a continuous- flow pilot plant and batch experiments. 627
Object Description
Purdue Identification Number | ETRIWC198674 |
Title | Treatability study of high strength landfill leachate |
Author |
Gaudy, Anthony F. Rozich, Alan F. Garniewski, Stephanie |
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. 627-638 |
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 627 |
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 | 74 TREATABILITY STUDY OF HIGH STRENGTH LANDFILL LEACHATE Anthony F. Gaudy, Jr., Professor Alan F. Rozich, Associate Scientist Stephanie Garniewski, Graduate Student Department of Civil Engineering University of Delaware Newark, Delaware 19716 INTRODUCTION The sanitary landfill was devised over four decades ago as a relatively inexpensive, hygienic way to bury solid refuse rather than continue the then prevalent practice of open dumping. At the time little consideration was given to the potential for groundwater pollution. The landfill is an attractive technology because, in addition to its simplicity and relatively low cost, it is an ultimate method of disposal (as, for example, compared to incineration of municipal refuse). As the use of this technique grew, there was increasing concern over pollution of groundwater by organic materials leached from the municipal refuse and, since many municipalities accepted industrial wastes as well as municipal refuse, there was increasing concern over the possibilities for entry of hazardous waste components into the groundwater resource. Today, mounting evidence for groundwater contamination mandates that modern landfill design provide means for containing all seepage, or leachate, from the fill. The sanitary landfill operated at Sandtown, Delaware, by the Delaware Solid Waste Authority is a state-of-the-art facility in which leachate is collected and held on the site, but as yet there is no provision for its treatment. The facility accepts solid industrial wastes as well as municipal refuse. The operational and managerial strategies for the facility are presented elsewhere [1]. Approximately 25,000-30,000 gallons of leachate are produced daily. Its BOD5 is approximately 100 times higher than that of municipal sewage and it contains significant amounts of heavy metals. Since the amenability of municipal landfill leachate to aerobic biological treatment has been rather widely reported and, since some of the work recently reported from our bio-environmental engineering laboratories has dealt with biological treatment of waste containing heavy metals [2,3] and inhibitory and toxic compounds [4,5,6,7] as well as conventional pollutants, the Delaware Solid Waste Authority approached us to discuss the possibilities for investigating the biological treatment of the Sandtown site leachate. Our task was essentially three-fold. There was need for additional information on the chemical characteristics of the leachate. The Authority, from time to time, had obtained BOD, COD, and metals analyses on the waste, as well as analyses for volatile acids concentrations, but a more systematic program of sampling and analysis was needed to gain some idea of the variations in composition which might be expected, as well as the average values. Since it is widely known that leachate composition varies from site to site, it is equally well- recognized that the amenability of the leachate to biological treatment can also vary. Thus, it was important to perform a treatability investigation on the leachate over a period of time sufficient to allow assessment of the biochemical response to variations which might occur in the waste composition. One of the best approaches to treatability studies which we have found is to determine values of the biokinetic parameters which govern the process. These are also the kinetic characteristics needed for insertion into kinetic models for prediction of performance and of the effects of variation in engineering control parameters on system performance. That is, the study should include the determination of the following biokinetic "constants": ^max, the maximum specific growth rate; Ks, the saturation constant; K,, the inhibition constant; kd, the specific decay rate; Yt, the true cell yield; and ka, the autodigestion constant. In our view, such studies require the running of both a continuous- flow pilot plant and batch experiments. 627 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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