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VOLUME REDUCTION AND DETOXIFICATION OF HAZARDOUS WASTES BY ENCAPSULATION IN AN ASPHALT BINDER Richard D. Doyle, Manager Hazardous Waste Treatment Systems Werner & Pfleiderer Corporation Ramsey, New Jersey 07446 Every week, the newspapers feature articles on the problems of waste disposal. Only a few areas in the country can categorically state that they are not affected by waste disposal problems. Problems can initiate from local generators, illegal dumping, well contamination, plans to locate a disposal site within the area, or a myriad of other reasons. In our high technology society, hazardous and toxic wastes are the inevitable by-products of this technology. With the wastes being produced, industry only has control of the amounts and types, and their ultimate disposal. Industry has responded to these waste problems by controlling or modifying their processes and returning to the basic 3R's of waste treatment; Reduce volumes at the source, Recycle all wastes possible, and Recover all that is economically beneficial. However, even with maximum use of these techniques, it is estimated that between 30-50 million tons of wet slurry and sludge type hazardous wastes will be generated this year. This large volume of waste generation, with disposal costs escalating, available secured disposal space decreasing, and the emotional aspects of waste disposal becoming increasingly more prominent, require that improvements in waste volume reduction and stabilization be utilized if our nation's production is to maintain continued growth. The utilization of an asphalt binder with a simple, one-step, extruder-evaporator process for encapsulation of sludges and slurries containing hazardous materials is one method of meeting the requirements to provide volume reduction and improved end-product leachabdity. This process has undergone considerable evolution since its inception in the 1960s. This evolution has allowed the full development of a well proven and safe system that has over 70 unit operating years. The system as developed by Werner & Pfleiderer Corporation (WPC) is a Volume Reduction and Solidification (VRS™) System that is appicable to many wet slurry and sludge wastes. In addition to its proven record of reliable operation and the production of a very stable end product, the VRS system also provides the operator with a significant annual cost savings when compared with most nonvolume reducing methodologies. In addition to having 14 units in routine operation for hazardous waste treatment, new applications and waste encapsulations are being continually demonstrated on one of the production sized extruders in the WPC development laboratory. Detads of the VRS process and its evolution are described in detail in the following sections. WPC-VRS PROCESS EVOLUTION In the early 1960s, the nuclear industry in Europe was experiencing problems analogous to the current hazardous waste disposal problems in the U.S. They were producing significant and ever-increasing volumes of slurry and sludge waste that required disposal at secured sites. These disposal sites were very limited in avadable space. With limited space, the cost of the disposal was very significant and generators were looking for ways of acceptably reducing the volume. In addition, most ultimate disposal sites were located in close proximity to high population areas or on the generators own property and therefore very strict end-product criteria were imposed. The major criterion imposed was the requirement that the end-product stabdity had to be maximized for long term storage. Stability was defined in terms of a monolithic solid, with no free moisture, environmental stabdity, and high 759
Object Description
Purdue Identification Number | ETRIWC198075 |
Title | Volume reduction and detoxification of hazardous wastes by encapsulation in an asphalt binder |
Author | Doyle, Richard D. |
Date of Original | 1980 |
Conference Title | Proceedings of the 35th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,31542 |
Extent of Original | p. 759-767 |
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 | 2009-10-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 759 |
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 | VOLUME REDUCTION AND DETOXIFICATION OF HAZARDOUS WASTES BY ENCAPSULATION IN AN ASPHALT BINDER Richard D. Doyle, Manager Hazardous Waste Treatment Systems Werner & Pfleiderer Corporation Ramsey, New Jersey 07446 Every week, the newspapers feature articles on the problems of waste disposal. Only a few areas in the country can categorically state that they are not affected by waste disposal problems. Problems can initiate from local generators, illegal dumping, well contamination, plans to locate a disposal site within the area, or a myriad of other reasons. In our high technology society, hazardous and toxic wastes are the inevitable by-products of this technology. With the wastes being produced, industry only has control of the amounts and types, and their ultimate disposal. Industry has responded to these waste problems by controlling or modifying their processes and returning to the basic 3R's of waste treatment; Reduce volumes at the source, Recycle all wastes possible, and Recover all that is economically beneficial. However, even with maximum use of these techniques, it is estimated that between 30-50 million tons of wet slurry and sludge type hazardous wastes will be generated this year. This large volume of waste generation, with disposal costs escalating, available secured disposal space decreasing, and the emotional aspects of waste disposal becoming increasingly more prominent, require that improvements in waste volume reduction and stabilization be utilized if our nation's production is to maintain continued growth. The utilization of an asphalt binder with a simple, one-step, extruder-evaporator process for encapsulation of sludges and slurries containing hazardous materials is one method of meeting the requirements to provide volume reduction and improved end-product leachabdity. This process has undergone considerable evolution since its inception in the 1960s. This evolution has allowed the full development of a well proven and safe system that has over 70 unit operating years. The system as developed by Werner & Pfleiderer Corporation (WPC) is a Volume Reduction and Solidification (VRS™) System that is appicable to many wet slurry and sludge wastes. In addition to its proven record of reliable operation and the production of a very stable end product, the VRS system also provides the operator with a significant annual cost savings when compared with most nonvolume reducing methodologies. In addition to having 14 units in routine operation for hazardous waste treatment, new applications and waste encapsulations are being continually demonstrated on one of the production sized extruders in the WPC development laboratory. Detads of the VRS process and its evolution are described in detail in the following sections. WPC-VRS PROCESS EVOLUTION In the early 1960s, the nuclear industry in Europe was experiencing problems analogous to the current hazardous waste disposal problems in the U.S. They were producing significant and ever-increasing volumes of slurry and sludge waste that required disposal at secured sites. These disposal sites were very limited in avadable space. With limited space, the cost of the disposal was very significant and generators were looking for ways of acceptably reducing the volume. In addition, most ultimate disposal sites were located in close proximity to high population areas or on the generators own property and therefore very strict end-product criteria were imposed. The major criterion imposed was the requirement that the end-product stabdity had to be maximized for long term storage. Stability was defined in terms of a monolithic solid, with no free moisture, environmental stabdity, and high 759 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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