Leachate generation, qualitative trends and groundwater contamination potential in dry deposits of fly ash
- Univ. of North Dakota, Grand Forks, ND (United States)
Globally, coal conversion solid residues (CCSRs) currently pose a potentially serious environmental problem due to the increasingly large volumes to be disposed of and the complexity of chemical and physical behavior. During the past 5 years, several experimental field test cells were designed and constructed under the sponsorship of the US Department of Energy using conventional industrial landfill practices as guidelines. Two 2.5-m-thick cells containing approximately 700-1000 tons each of waste were emplaced. The experiments focused on (1) engineering behavior, (2) diagenesis of buried advanced process residues, and (3) long-term impact of natural leaching processes on the surrounding environment. An intensive monitoring effort generated a substantial project database consisting of baseline chemical characterizations of initial and buried fly ash; x-ray diffraction (XRD), x-ray fluorescence (XRF), and scanning electron microscopy (SEM) analysis of mineral composition and transformations within the cells; American Society of Testing and Materials (ASTM) leachate chemistry; physical properties of soil and ash drill cores; water chemistry of runoff; and pore waters from soil vacuum pressure lysimeters and groundwater in surrounding monitoring wells. On-site meteorological, borehole permeameter, and moisture density data also support quantification of the extent of percolation and flushing.
- OSTI ID:
- 588902
- Report Number(s):
- CONF-9605286-; TRN: 98:001296-0082
- Resource Relation:
- Conference: 13. annual meeting of the American Society for Surface Mining and Reclamation (ASSMR), Knoxville, TN (United States), 18-23 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of Successes and failures: Applying research results to insure reclamation success; Daniels, W.L.; Burger, J.A.; Zipper, C.E. [Virginia Tech, Blacksburg, VA (United States). Depts. of Crop and Soil Environmental Sciences and Forestry] [eds.]; PB: 889 p.
- Country of Publication:
- United States
- Language:
- English
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