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This paper (presents typical approaches to the evaluation of the MAECTITE® chemical fixation/stabilization technology for use on lead and heavy metal bearing waste streams and materials ranging from treatability scale viability demonstrations to full-scale project applications. In addition, a brief technology history and technical overview is presented with analytical data supporting a range of applications to various lead bearing materials. Finally, two (2) full-scale projects are examined that depict a range of project magnitudes and complexities that incorporated common MAECTITE® technology application forms.MAECTITE Chemical Fixation/Stabilization for Lead-Cadmium & Heavy Metals - Ca...
MAECTITE Chemical Fixation/Stabilization for Lead-Cadmium & Heavy Metals - Ca...Sevenson Environmental
During the last several years advances have occurred in the practice of remediating toxic heavy metals in soil and other media. Pozzolanic and silicic systems which attempt to entrap contaminants and chemical buffering systems which seek to minimize metal solubility by maintaining pH at artificially high levels are being phased out. Growing in use are chemical treatment/crystallization systems that incorporate heavy metals into durable, insoluble mineral crystal forms. The MAECTITE® process targets the formation of phosphate minerals, especially apatites. The hardness, chemical stability, thermal stability, and isomorphic properties of apatites make them ideal for reducing the leachability of metals. Since 1989, more than 700,000 tons of heavy metal contaminated soil, sludge, sediment, and debris have been successfully treated at over 50 sites using the MAECTITE® process. Advantages over other methods include cost savings, flexible application (exsitu, insitu, or in-line), regulatory acceptance, ability to handle both ionic and metals species (e.g. Pb, As, Cr, Cd, U, Sr), consistency of analytical results, longevity, improved leachability control, and in most cases, reduction in waste volume. This paper presents the evolution of the MAECTITE® chemical process and offers a full-scale study. The case study illustrates the removal of lead impacted soils from small arms target ranges at the Massachusetts Military Reservation. The authors believe that the advantages of chemical treatment/crystallization will establish it as the remediation method of choice for toxic heavy metals and radionuclides. MAECTITE® is a registered trademark and is patented by the USPTO. Advances in Heavy Metal Fixation, Chemical Treatment/Crystallization - MAECTI...
Advances in Heavy Metal Fixation, Chemical Treatment/Crystallization - MAECTI...Sevenson Environmental
Lead and other heavy metals are chemically fixated using the MAECTITE® treatment process. Treatment reactions convert leachable metal species to geochemically stable and hardened mixed mineral forms within the waste matrix that are resistant to EPTOX, TCLP, MEP, acid-leach and other test methods utilized to define RCRA toxic waste and waste product longevity. Case history data from comprehensive treatability studies support process utilization on all soil types examined, debris, and solid waste consisting of battery casings, lead projectiles, sludges, slag, paint chips with abrasives, and other waste material types. Through detailed remedial work plans and other mechanisms combining engineering, geologic, soil science, and operational construction disciplines, full-scale MAECTITE® processing at RCRA, NPL, emergency response, and other lead contaminated sites on private, state, and federally funded projects have been successfully addressed. The MAECTITE® process has been patented and registered with the U.S. Patent Trademark Office.Lead and Heavy Metal Fixation in Soils and Solid Waste by the MAECTITE Chemic...
Lead and Heavy Metal Fixation in Soils and Solid Waste by the MAECTITE Chemic...Sevenson Environmental
Recommended
This paper (presents typical approaches to the evaluation of the MAECTITE® chemical fixation/stabilization technology for use on lead and heavy metal bearing waste streams and materials ranging from treatability scale viability demonstrations to full-scale project applications. In addition, a brief technology history and technical overview is presented with analytical data supporting a range of applications to various lead bearing materials. Finally, two (2) full-scale projects are examined that depict a range of project magnitudes and complexities that incorporated common MAECTITE® technology application forms.MAECTITE Chemical Fixation/Stabilization for Lead-Cadmium & Heavy Metals - Ca...
MAECTITE Chemical Fixation/Stabilization for Lead-Cadmium & Heavy Metals - Ca...Sevenson Environmental
During the last several years advances have occurred in the practice of remediating toxic heavy metals in soil and other media. Pozzolanic and silicic systems which attempt to entrap contaminants and chemical buffering systems which seek to minimize metal solubility by maintaining pH at artificially high levels are being phased out. Growing in use are chemical treatment/crystallization systems that incorporate heavy metals into durable, insoluble mineral crystal forms. The MAECTITE® process targets the formation of phosphate minerals, especially apatites. The hardness, chemical stability, thermal stability, and isomorphic properties of apatites make them ideal for reducing the leachability of metals. Since 1989, more than 700,000 tons of heavy metal contaminated soil, sludge, sediment, and debris have been successfully treated at over 50 sites using the MAECTITE® process. Advantages over other methods include cost savings, flexible application (exsitu, insitu, or in-line), regulatory acceptance, ability to handle both ionic and metals species (e.g. Pb, As, Cr, Cd, U, Sr), consistency of analytical results, longevity, improved leachability control, and in most cases, reduction in waste volume. This paper presents the evolution of the MAECTITE® chemical process and offers a full-scale study. The case study illustrates the removal of lead impacted soils from small arms target ranges at the Massachusetts Military Reservation. The authors believe that the advantages of chemical treatment/crystallization will establish it as the remediation method of choice for toxic heavy metals and radionuclides. MAECTITE® is a registered trademark and is patented by the USPTO. Advances in Heavy Metal Fixation, Chemical Treatment/Crystallization - MAECTI...
Advances in Heavy Metal Fixation, Chemical Treatment/Crystallization - MAECTI...Sevenson Environmental
Lead and other heavy metals are chemically fixated using the MAECTITE® treatment process. Treatment reactions convert leachable metal species to geochemically stable and hardened mixed mineral forms within the waste matrix that are resistant to EPTOX, TCLP, MEP, acid-leach and other test methods utilized to define RCRA toxic waste and waste product longevity. Case history data from comprehensive treatability studies support process utilization on all soil types examined, debris, and solid waste consisting of battery casings, lead projectiles, sludges, slag, paint chips with abrasives, and other waste material types. Through detailed remedial work plans and other mechanisms combining engineering, geologic, soil science, and operational construction disciplines, full-scale MAECTITE® processing at RCRA, NPL, emergency response, and other lead contaminated sites on private, state, and federally funded projects have been successfully addressed. The MAECTITE® process has been patented and registered with the U.S. Patent Trademark Office.Lead and Heavy Metal Fixation in Soils and Solid Waste by the MAECTITE Chemic...
Lead and Heavy Metal Fixation in Soils and Solid Waste by the MAECTITE Chemic...Sevenson Environmental
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