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63 LEAD AND OTHER HEAVY METAL FIXATION IN SOILS AND SOLID WASTE BY THE MAECTITE® CHEMICAL TREATMENT PROCESS Karl W. Yost, Director of Treatment Services Sevenson Environmental Services, Incorporated Niagara Falls, New York 14302 Dhiraj Pal, Manager of Research and Development Sevenson Environmental Services, Incorporated Munster, Indiana 46321 S.A. Chisick, Senior Geologist Sevenson Environmental Services, Incorporated Munster, Indiana 46321 W.V. Jesernig, Engineer W.V. Jesernig and Associates, Incorporated Bolingbrook, Illinois 60440 INTRODUCTION Waste stabilization/solidification (S/S) methods utilize the engineered concept of physical binding mechanisms to encapsulate (micro and/or macro), entrap, absorb, contain, coat, or seal target analytes within the waste matrix. These treatment methods physically immobilize heavy metals by surface effects, plate polarity, hydration and/or adhesion principles to render waste characteristically non-hazardous (Conner, 1985).' To confirm treatment, S/S treated material is exposed to geotechnical test criteria that apply various physical forces or conditions to the treated mass. Failure is determined by the identification or quantification of fractures, permeability, strength, or defects. If failure occurs, physical immobilization binder mechanisms are also destroyed and new surfaces are created in the waste mass allowing for release or direct attack of formerly immobilized metal species. Further, in the presence of acidity, weakly absorbed metals may disassociate and readily diffuse to aqueous media or carrier fluid. The alleged physically immobilized mixtures generate a problem that compromise long-term stability thereby increasing inherent risk of future or current remediation costs. While the current status of risk-free solid hazardous waste treatment for heavy metals is far from optimal efficiency (i.e., 100% removal of the total metals from the waste), many inroads to a solution have emerged. One approach is chemical treatment. With this technology, heavy metals are chemically induced to nucleate forming crystals of mineral and mixed mineral forms. These minerals are microscopic, hard, geometrically dense, acid resistant, and will not degrade or fail under traditional geotechnical and environmental forces that prevail in landfill or natural settings. The MAECTITE® chemical process falls into the chemical treatment category. MAECTITE® CHEMICAL PROCESS DISCUSSION Leachable lead and other metals are chemically bound in hard and superhard mineral species that are resistant to acid leaching such as those simulated during EP toxicity leach test, toxic characteristic leaching procedure (TCLP), multiple extraction procedure (MEP) and other tests developed and approved by USEPA. Two categories (Group I and II) of treatment chemicals are usually required in variable amounts for the MAECTITE® chemical process to be effective in decreasing the TCLP lead from thousands of mg/L to less than 1 mg/L in a diverse variety of waste media. Treatment chemicals of Group I are in the main calcium (Ca) and/or magnesium based buffers, salts and/or bases. Treatability studies are designed and executed to identify which additive of Group I is most cost effective on a particular waste type. Treatment additives from Group I form insoluble 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 597
Object Description
Purdue Identification Number | ETRIWC199463 |
Title | Lead and other heavy metal fixation in soils and solid waste by the Maectite chemical treatment process |
Author |
Yost, Karl W. Pal, Dhiraj Chisick, S. A. (Steven A.) Jesernig, W. V. |
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. 597-606 |
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 597 |
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 | 63 LEAD AND OTHER HEAVY METAL FIXATION IN SOILS AND SOLID WASTE BY THE MAECTITE® CHEMICAL TREATMENT PROCESS Karl W. Yost, Director of Treatment Services Sevenson Environmental Services, Incorporated Niagara Falls, New York 14302 Dhiraj Pal, Manager of Research and Development Sevenson Environmental Services, Incorporated Munster, Indiana 46321 S.A. Chisick, Senior Geologist Sevenson Environmental Services, Incorporated Munster, Indiana 46321 W.V. Jesernig, Engineer W.V. Jesernig and Associates, Incorporated Bolingbrook, Illinois 60440 INTRODUCTION Waste stabilization/solidification (S/S) methods utilize the engineered concept of physical binding mechanisms to encapsulate (micro and/or macro), entrap, absorb, contain, coat, or seal target analytes within the waste matrix. These treatment methods physically immobilize heavy metals by surface effects, plate polarity, hydration and/or adhesion principles to render waste characteristically non-hazardous (Conner, 1985).' To confirm treatment, S/S treated material is exposed to geotechnical test criteria that apply various physical forces or conditions to the treated mass. Failure is determined by the identification or quantification of fractures, permeability, strength, or defects. If failure occurs, physical immobilization binder mechanisms are also destroyed and new surfaces are created in the waste mass allowing for release or direct attack of formerly immobilized metal species. Further, in the presence of acidity, weakly absorbed metals may disassociate and readily diffuse to aqueous media or carrier fluid. The alleged physically immobilized mixtures generate a problem that compromise long-term stability thereby increasing inherent risk of future or current remediation costs. While the current status of risk-free solid hazardous waste treatment for heavy metals is far from optimal efficiency (i.e., 100% removal of the total metals from the waste), many inroads to a solution have emerged. One approach is chemical treatment. With this technology, heavy metals are chemically induced to nucleate forming crystals of mineral and mixed mineral forms. These minerals are microscopic, hard, geometrically dense, acid resistant, and will not degrade or fail under traditional geotechnical and environmental forces that prevail in landfill or natural settings. The MAECTITE® chemical process falls into the chemical treatment category. MAECTITE® CHEMICAL PROCESS DISCUSSION Leachable lead and other metals are chemically bound in hard and superhard mineral species that are resistant to acid leaching such as those simulated during EP toxicity leach test, toxic characteristic leaching procedure (TCLP), multiple extraction procedure (MEP) and other tests developed and approved by USEPA. Two categories (Group I and II) of treatment chemicals are usually required in variable amounts for the MAECTITE® chemical process to be effective in decreasing the TCLP lead from thousands of mg/L to less than 1 mg/L in a diverse variety of waste media. Treatment chemicals of Group I are in the main calcium (Ca) and/or magnesium based buffers, salts and/or bases. Treatability studies are designed and executed to identify which additive of Group I is most cost effective on a particular waste type. Treatment additives from Group I form insoluble 49th Purdue Industrial Waste Conference Proceedings, 1994 Lewis Publishers, Chelsea, Michigan 48118. Printed in U.S.A. 597 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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