Use of fly ash as a waste minimization strategy

✍ Scribed by Wentz, C. A. ;Moretti, C. J. ;Henke, K. R. ;Manz, O. E. ;Wiken, K. U.

• Publisher: American Institute of Chemical Engineers
• Year: 1988
• Tongue: English
• Weight: 637 KB
• Volume: 7
• Category: Article
• ISSN: 0278-4491
• DOI: 10.1002/ep.3300070317

✦ Synopsis

Cost-eflective liner materials for waste disposal that would meet state regulatory requirements for liner permeability while reusing coal combustion fly ash, reducing ash disposal costs were developed. Liner development criteria included a permeability of less than cmls and a durability'comparable to that of conventional clay liners. Fly ash samples from six utility companies located in five states were used. These samples were representative of the large quantities offly ash available from coal-fired power plants. When mixed with 3-9.5% by weight portland cement andlor lime, each of the samples yielded liners with permeabilities signijicantly less than lo-' cmls and compression strengths generally exceeding 400 psig. Liner construction costs ranged from $0.05 to $0.44 f t [.I, with the costs depending on the quantities of$y ash and additives used, formulation mixing method, and plucement and compaction methods for the lifts. Studies of leuchate from eachfly ash found that none of them would be hazardous under current regulatory guidelines.