Fly ash dynamics in soil‐water systems

Sharma, Sudhirendar; Fulekar, M. H.; Jayalakshmi, C. P.; Sträub, Conrad P.

doi:10.1080/10643388909388367

Cited by 49 publications

(22 citation statements)

References 55 publications

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“…They depend mainly on the bulk density and water content of the soil. The conflicting reports regarding the influence of fly ash on soil Db have been summarized by Sharma et al (1989), who reported that where initial soil Db was > 1.25 Mg m -3 , Db decreased with the addition of fly ash. However, Db increased with the addition of fly ash to soils with an initial Db between 0.89 and 1.01 Mg m -3 .…”

Section: Discussionmentioning

confidence: 99%

“…Its potential benefits include altering soil texture and enhancing water-holding capacity, increasing soil pH (depending on source), and enhancing soil fertility (Carlson and Adriano 1993). Several researchers have indicated, with reference to Adriano et al (1980), that the application of fly ash as a soil amendment will result in increased soil temperatures (Sharma et al 1989;Carlson and Adriano 1993). An increase in soil temperature could be an additional benefit of fly ash application in northern regions where seeding is delayed by low spring soil temperatures.…”

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confidence: 99%

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Fly ash influence on near-surface temperature of a clay loam soil

Hammermeister¹,

Chanasyk

Naeth

1998

Can. J. Soil. Sci.

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. 1998. Fly ash influence on near-surface temperature of a clay loam soil. Can. J. Soil Sci. 78: [345][346][347][348][349][350]. It has been suggested that fly ash, when applied as a soil amendment, would increase soil temperature. However, no quantitative data have been provided to support this hypothesis. This hypothesis was tested on four fly ash treatments (0, 100, 200, and 400 t ha -1 ) applied to clay loam soil in a randomized block design. Bi-hourly soil temperatures were measured on 3 summer days over 2 yr, and afternoon temperatures were measured on randomly selected spring days at 5-, 10-, and 20-cm depths in the four fly ash treatments. Temperatures were measured in conjunction with surface bulk density, water content, and particle size distribution which were also used to calculate thermal heat capacity. Fly ash decreased percent clay, soil water content, and soil heat capacity. Contrary to previously expected trends, fly ash amendment did not significantly increase mean daily soil temperature under dry conditions. Generalizations in the literature regarding the influence of fly ash on soil temperature, bulk density, and water-holding capacity must be considered carefully since they generally relate only to coarse to medium textured soils.Key words: Soil amendments, bulk density, reclamation, heat capacity, thermal diffusivity, thermal conductivity, volumetric water content, particle size distribution On mesurait aussi la température d'après-midi (14-16 h) à certains jours de printemps choisis au hasard. En même temps que la température du sol, on mesurait la densité apparente, la teneur en eau et la répartition granulométrique du sol de surface, ce qui a servi également à calculer la capacité calorifique totale. La présence de cendres volantes abaissait le pourcentage d'argile, la teneur en eau du sol et sa capacité calorifique. Contrairement aux tendances attendues, l'apport de cendres volantes n'accroissaient pas significativement la température moyenne journalière du sol en conditions arides. Les tentatives de généralisation publiées au sujet de l'influence des cendres volantes sur la température, la densité apparente et la capacité de rétention d'eau du sol doivent donc être abordé avec prudence puisqu'elles ne portent que sur des sols de texture grossière à moyenne.Mots clés: Amendements du sol, densité apparente, remise en valeur, capacité calorifique, diffusivité thermique, conductivité thermique, teneur volumétrique en eau, répartition granulométrique

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Fly ash influence on near-surface temperature of a clay loam soil

Hammermeister¹,

Chanasyk

Naeth

1998

Can. J. Soil. Sci.

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“…However, leachability of heavy metals from coal FA is relatively low and leaching extent depends on the conditions of the system. Trace metal concentration in the leachate depends on FA weight/solution, concentration of elements, pH, temperature, pressure, and time (Pandey and Singh 2010 (Sharma 1989;Mandal and Sengupta 2003;Papastefanou 2008), and other radionuclides, such as uranium (U) and thorium (Th) series (Tadmore 1986). However, most FAs are not significantly enriched in radioactive elements compared to common soils or rocks (Zielinski and Finkelman 1997).…”

Section: Agriculturementioning

confidence: 99%

Fly Ash Pollutants, Treatment and Recycling

Gianoncelli

Zacco

Struis

et al. 2013

Environmental Chemistry for a Sustainable World

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“…A 200 megawatt capacity generating unit produces 2 metric tons of ash each minute. The estimated U.S. production in 1985 was 100 million tonnes (Sharma et aL, 1989). The nature and quantities of coal combustion wastes have been extensively reviewed (Adriano et al, 1980;Cervelli et aL, 1987;Sharma et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Impact of coal combustion waste on the microbiology of a model aquifer

Brunning

Caldwell

Lawrence³

et al. 1994

Water Air Soil Pollut

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Abstract. The effects of water infiltration into an alkaline coal combustion waste burial site on the chemical and microbiological aspects of a meso-scale (2.44 m diameter • 4.6 m, height, 65 tonne) model aquifer were analyzed. The spatial and temporal effects of the alkaline leachate on microbial activity, numbers and diversity were examined in the model and compared with uncontaminated control materials. Within the saturated zone below the waste there was a pH gradient from 12.4 at the water table, immediately below the waste, to 6.0 at 3.5 meters from the waste, and elevated levels of arsenic and strontium in the pore waters. Microtox testing of the contaminated pore waters indicated high toxicity (a gamma value of 1 at dilutions of 45 to 110 fold). The leachate contamination was associated with a reduction in bacterial [3H] leucine incorporation from a high of 267 fmol g-1 h-' in sediments below the contaminant plume to undetectable in the contaminated zone. In comparison, leucine incorporation rates in control column sediments were 899 fmol g-i h-'. Similar toxic effects were evident in reduced total direct and culturable counts of bacteria. Observations also indicated a reduction in microbial diversity and development of alkaline-tolerant microbial communities. These results indicated that any failure of confinement technologies at disposal sites would adversely affect both the chemistry and microbiology of the underlying saturated zone.

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Fly ash dynamics in soil‐water systems

Cited by 49 publications

References 55 publications

Fly ash influence on near-surface temperature of a clay loam soil

Fly ash influence on near-surface temperature of a clay loam soil

Fly Ash Pollutants, Treatment and Recycling

Impact of coal combustion waste on the microbiology of a model aquifer

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