Hazardous waste stabilization with clean-coal technology ash residuals

Clean coal technology by-products, collected from commercial operations under steady state conditions, are reacted at bench-scale with metal-laden hazardous wastes. Reaction conditions involve mixing calibrated weight ratios of by-product to hazardous waste with attention to minimizing added moistur...

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Bibliographic Details
Published in:Water science and technology 1996-01, Vol.34 (10), p.179-185
Main Authors: Neufeld, Ronald D, Cobb, James T, Pritts, J, Clifford, V, Bender, C, Beeghley, J
Format: Article
Language:English
Subjects:
By products
Byproducts
Clean technology
Coal
Compressive strength
Experimentation
Hazardous wastes
Heavy metals
Leaching
Lead
Moisture
Moisture content
Ratios
Stabilization
Technology
Time compression
Wastes
Water content
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Summary:Clean coal technology by-products, collected from commercial operations under steady state conditions, are reacted at bench-scale with metal-laden hazardous wastes. Reaction conditions involve mixing calibrated weight ratios of by-product to hazardous waste with attention to minimizing added moisture. Of the 15 heavy metals monitored, lead appeared to be the element of greatest concern both from a leaching and a regulatory point of view. While leaching information is focused on lead stabilization, similar information exists for other metals as well. Stabilized solid products of reactions are sampled for TCLP evaluations. For samples showing evidence of metal stabilization, further experimentation was conducted evaluating optimum moisture content and development of physical strength (measured as compressive strength) over time of curing. Results show that certain hazardous wastes are highly amenable to chemical stabilization, while others are not; certain by-products provided superior stabilization, but did not allow for strength generation over time.
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(96)00712-3