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Title: The impacts of coal refuse/fly ash bulk bends on water quality and plant growth

Abstract

There is considerable interest in the beneficial reuse of coal fly ash as a soil amendment on coal refuse piles. One method of application would be to blend the coal refuse and the fly ash before deposition in a refuse pile. A field experiment was initiated to measure the effects of bulk blending fly ash with coal refuse on water quality and plant growth parameters. Fly ash (class F) from three sources were used in the experiment. Two of the fly ashes were acidic and the third was alkaline. Trenches were excavated in a coal refuse pile to a depth of 2 m and the refuse was blended with fly ash and then returned to the trench. In other plots the ash was applied as a surface amendment. A treatment of a bulk blend of 5% (w/w) rock phosphate was also included in the experiment. Large volume lysimeters were installed in some trenches to collect the leachates. The fly ash treatments appear to improve the quality of the leachates when compared to the leachates from the untreated plots. The fly ash amended treatments have lower leachate concentrations of Fe and Al. Initially the fly ash treatments showed high levels ofmore » leachate B, however those levels have decreased with time. Millet (Setaria italica) yields from the first year of the experiment were highest n the alkaline fly ash and rock phosphate blended plots. In the second growing season, the two bulk blends with alkaline fly ash had the highest yields. In the third growing season all treatments had higher yield levels than the untreated control plots. The positive effects of the fly ash on leachate quality were attributed to the alkalinity of the ash, and the increase in yield was attributed to the increases in water holding capacity due to fly ash treatments.« less

Authors:
;  [1]
  1. Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States)
Publication Date:
OSTI Identifier:
98657
Report Number(s):
CONF-9506226-
CNN: Grant G1134251; TRN: 95:006357-0004
Resource Type:
Conference
Resource Relation:
Conference: 12. American Society for Surface Mining and Reclamation annual meeting: decades later - a time for reassessment, Gillette, WY (United States), 3-8 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of Decades later: A time for reassessment. Volume 1 and Volume 2; Schuman, G.E. [High Plains Grasslands Research Station, Cheyenne, WY (United States)]; Vance, G.F. [Univ. of Wyoming, Laramie, WY (United States)] [eds.]; PB: 889 p.
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 54 ENVIRONMENTAL SCIENCES; COAL FINES; ENVIRONMENTAL EFFECTS; FLY ASH; GROUND WATER; WATER QUALITY; BIOMASS; PLANT GROWTH; MIXING; WATER POLLUTION; LEACHATES; LEACHING; SOILS

Citation Formats

Stewar, B R, and Daniels, W L. The impacts of coal refuse/fly ash bulk bends on water quality and plant growth. United States: N. p., 1995. Web.
Stewar, B R, & Daniels, W L. The impacts of coal refuse/fly ash bulk bends on water quality and plant growth. United States.
Stewar, B R, and Daniels, W L. Fri . "The impacts of coal refuse/fly ash bulk bends on water quality and plant growth". United States.
@article{osti_98657,
title = {The impacts of coal refuse/fly ash bulk bends on water quality and plant growth},
author = {Stewar, B R and Daniels, W L},
abstractNote = {There is considerable interest in the beneficial reuse of coal fly ash as a soil amendment on coal refuse piles. One method of application would be to blend the coal refuse and the fly ash before deposition in a refuse pile. A field experiment was initiated to measure the effects of bulk blending fly ash with coal refuse on water quality and plant growth parameters. Fly ash (class F) from three sources were used in the experiment. Two of the fly ashes were acidic and the third was alkaline. Trenches were excavated in a coal refuse pile to a depth of 2 m and the refuse was blended with fly ash and then returned to the trench. In other plots the ash was applied as a surface amendment. A treatment of a bulk blend of 5% (w/w) rock phosphate was also included in the experiment. Large volume lysimeters were installed in some trenches to collect the leachates. The fly ash treatments appear to improve the quality of the leachates when compared to the leachates from the untreated plots. The fly ash amended treatments have lower leachate concentrations of Fe and Al. Initially the fly ash treatments showed high levels of leachate B, however those levels have decreased with time. Millet (Setaria italica) yields from the first year of the experiment were highest n the alkaline fly ash and rock phosphate blended plots. In the second growing season, the two bulk blends with alkaline fly ash had the highest yields. In the third growing season all treatments had higher yield levels than the untreated control plots. The positive effects of the fly ash on leachate quality were attributed to the alkalinity of the ash, and the increase in yield was attributed to the increases in water holding capacity due to fly ash treatments.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {9}
}

Conference:
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