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TAILOR-MADE PROCESSES FOR INTEGRATED STABILIZATION-SOLIDIFICATION OF ACID, BASIC, ALKALINE, AND ORGANIC WASTES Philippe Pichat, Ph.D. Groupe CdF Chimie Paris, France INTRODUCTION In some cases, it is desirable to precede the landfilling of waste by a pretreatment. Let us look at a certain number of cases where this pretreatment is required. Landfilling sites are far away from waste production plants and the transportation of wastes would involve heavy energy expenditures and, consequently, an unbearable cost burden for the waste producer. From another point of view, road transportation of liquid wastes cost approximately twice the transportation of a solid. The cost of landfilling is high because it requires heavy investments such as in the construction of dams in civil engineering (particularly in the case of thixotropic sludges). Hydrogeological and physical-chemical properties of the landfill (and its components as well) show some variations in time and space. Several wastes can increase the permeability of clay liners [1] or synthetic linings [2]. The hydric cycle of the landfill is such that an overflow can take place. The waste is very toxic. Nearby, a residential area is located which uses either an aqueous underground or a stream [3]. The composition of the waste induces solidification. The waste has a particularly high water content. Its incineration is not economically feasible. The waste has a high organic content and a high caustic content. The use of the usual incineration equipment is not adapted because of corrosion problems or the method of incineration which is available would give off an ash causing strong lixiviation. Biological methods, mixed composting, dispersion, spraying, land farming are not plausible because either the waste is too toxic, its biodegradable material content is low, or the natural environment is inadequate. HYDRAULIC BINDERS: HISTORIC REACTIONS Experience shows that even when wastes are said to be "solid," they may contain a rather significant percentage of water (around 30% to 95%). How can we thicken, immobilize the water, when is a carrier of pollutant elements found later in the ground and underground? The constituents of hydraulic binders, silica, anhydrous silicates (C2S and C3S), and calcium aluminates (C3 A) react upon contact with water, and, if necessary, with lime to set into calcium silicates and hydrated calcium aluminates. In Rome, we can see the "Cloaca Maxima" (Figure 1), a sewer built around 500 years BC, which withstood sewage for almost 2,500 years, and, of a different nature, the elegant dome of the Pantheon (Figure 2). In Ostia Antica, some remnants of the old harbor can be seen; its stone has been defaced whereas its mortar is intact. 417
Object Description
Purdue Identification Number | ETRIWC198343 |
Title | Tailor-made processes for integrated stabilization-solidification of acid, basic, alkaline, and organic wastes |
Author | Pichat, Philippe |
Date of Original | 1983 |
Conference Title | Proceedings of the 38th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,34749 |
Extent of Original | p. 417-422 |
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 | 2009-07-28 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 417 |
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 | TAILOR-MADE PROCESSES FOR INTEGRATED STABILIZATION-SOLIDIFICATION OF ACID, BASIC, ALKALINE, AND ORGANIC WASTES Philippe Pichat, Ph.D. Groupe CdF Chimie Paris, France INTRODUCTION In some cases, it is desirable to precede the landfilling of waste by a pretreatment. Let us look at a certain number of cases where this pretreatment is required. Landfilling sites are far away from waste production plants and the transportation of wastes would involve heavy energy expenditures and, consequently, an unbearable cost burden for the waste producer. From another point of view, road transportation of liquid wastes cost approximately twice the transportation of a solid. The cost of landfilling is high because it requires heavy investments such as in the construction of dams in civil engineering (particularly in the case of thixotropic sludges). Hydrogeological and physical-chemical properties of the landfill (and its components as well) show some variations in time and space. Several wastes can increase the permeability of clay liners [1] or synthetic linings [2]. The hydric cycle of the landfill is such that an overflow can take place. The waste is very toxic. Nearby, a residential area is located which uses either an aqueous underground or a stream [3]. The composition of the waste induces solidification. The waste has a particularly high water content. Its incineration is not economically feasible. The waste has a high organic content and a high caustic content. The use of the usual incineration equipment is not adapted because of corrosion problems or the method of incineration which is available would give off an ash causing strong lixiviation. Biological methods, mixed composting, dispersion, spraying, land farming are not plausible because either the waste is too toxic, its biodegradable material content is low, or the natural environment is inadequate. HYDRAULIC BINDERS: HISTORIC REACTIONS Experience shows that even when wastes are said to be "solid," they may contain a rather significant percentage of water (around 30% to 95%). How can we thicken, immobilize the water, when is a carrier of pollutant elements found later in the ground and underground? The constituents of hydraulic binders, silica, anhydrous silicates (C2S and C3S), and calcium aluminates (C3 A) react upon contact with water, and, if necessary, with lime to set into calcium silicates and hydrated calcium aluminates. In Rome, we can see the "Cloaca Maxima" (Figure 1), a sewer built around 500 years BC, which withstood sewage for almost 2,500 years, and, of a different nature, the elegant dome of the Pantheon (Figure 2). In Ostia Antica, some remnants of the old harbor can be seen; its stone has been defaced whereas its mortar is intact. 417 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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