Heavy metals release from ash pond to soil water environment: A simulated technique

Fulekar, M. H.; Dave, J.M.

doi:10.1016/0160-4120(92)90111-g

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…Sr and Ca showed progressively lower concentrations in leachates with increasing pH. These results are consistent with previous laboratory leaching experiments − ,, . The differential LCACs mobilization generated large variations in the contaminants’ ratios (e.g., As/B, Se/As; Figure ).…”

Section: Resultssupporting

confidence: 90%

“…The high concentrations of LCACs in CCRs − and their enhanced mobility in aquatic systems − are the key factors for evaluating potential risks of CCRs to the environment. The TVA spill has provided a unique opportunity to examine these effects on a regional field scale, beyond laboratory leaching tests ,− . The objectives of this study are (1) to provide a systematic 18-month monitoring survey of the environmental impacts following the TVA coal ash spill in Kingston, Tennessee; (2) to examine the composition of major constituents and trace metals in water samples from different sites associated with the ash spill, including upstream and downstream river waters, tributary waters, and porewater extracted from the river sediments; (3) to conduct laboratory leaching experiments on the TVA coal ash for evaluating the factors that control LCACs composition and mobilization; (4) to examine the possible river quality impacts upon dredging of the ash from the rivers, which was part of the major remediation plan by TVA ; and (5) to evaluate the impact of redox conditions that prevail in river sediments on the reactivity of coal ash in the environment, particularly for arsenic mobilization and species distribution.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Impacts of the Coal Ash Spill in Kingston, Tennessee: An 18-Month Survey

Ruhl

Vengosh

Dwyer

et al. 2010

Environ. Sci. Technol.

143

122

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An 18 month investigation of the environmental impacts of the Tennessee Valley Authority (TVA) coal ash spill in Kingston, Tennessee combined with leaching experiments on the spilled TVA coal ash have revealed that leachable coal ash contaminants (LCACs), particularly arsenic, selenium, boron, strontium, and barium, have different effects on the quality of impacted environments. While LCACs levels in the downstream river water are relatively low and below the EPA drinking water and ecological thresholds, elevated levels were found in surface water with restricted water exchange and in pore water extracted from the river sediments downstream from the spill. The high concentration of arsenic (up to 2000 µg/L) is associated with some degree of anoxic conditions and predominance of the reduced arsenic species (arsenite) in the pore waters. Laboratory leaching simulations show that the pH and ash/water ratio control the LCACs' abundance and geochemical composition of the impacted water. These results have important implications for the prediction of the fate and migration of LCACs in the environment, particularly for the storage of coal combustion residues (CCRs) in holding ponds and landfills, and any potential CCRs effluents leakage into lakes, rivers, and other aquatic systems.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Environmental Impacts of the Coal Ash Spill in Kingston, Tennessee: An 18-Month Survey

Ruhl

Vengosh

Dwyer

et al. 2010

Environ. Sci. Technol.

143

122

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“…After the processes of oxidation and corrosion, these metals will dissolved in rain water and leached into soil from where they are picked up by growing plants thereby entering the food chain 3 . Improper wastes management methods also pilot the contamination of underground water 4,5 while most of the metals are being washed away by runoff into streams and rivers thereby contaminating the marine environment 6 . Consequently, these metals accumulate in fish and other aquatic organisms, thus posing a health threat to the consumers 7 .…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Contents of Municipal and Rural Dumpsite Soils and Rate of Accumulation by Carica papaya and Talinum triangulare in Uyo, Nigeria

Ebong

Akpan

Mkpenie

2007

Journal of Chemistry

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Dumpsites in Uyo and most cities in Nigeria are used nutrients rich soils for cultivating fruits and vegetables without regards to the risk of toxic metal pollution by the wastes. This development necessitated the research on the assessment of the impact of municipal and rural dumpsites on the metal levels of the underlying soils, the relationship between the dumpsite- soil metal content and the rate of bio-accumulation by plants, the effect of plant specie and plant part on the rate of metal uptake. Atomic absorption spectrophotometer was employed for the analysis of the samples and results obtained from municipal dumpsite soil indicated the following mean concentrations: Fe, 1711.20 μg/g; Pb, 43.28 ug/g; Zn, 88.34 ug/g; Ni, 12.18 ug/g; Cd, 14.10 ug/g and Cu, 56.33 ug/g. These concentrations were relatively higher than the following concentrations: Fe, 1016.98 ug/g; Pb, 18.57 ug/g; Zn, 57.90 ug/g; Ni, 7.98 ug/g; Cd, 9.25 ug/g and Cu, 33.70 ug/g recorded for the rural dumpsite soil. Consequently, plants grown on municipal dumpsites soil accumulated higher concentrations of the metals than those on rural dumpsites. Results obtained from this study also revealed that plants grown on dumpsite soils bio-accumulated higher metal concentrations than their counterparts obtained from normal agricultural soils. The ability of plants to bioaccumulate these metals were also observed as being different from one plant to the other and from one plant parts to the other. And apart from Fe and Zn which recorded higher concentrations in the leaves of the plants studied, other metals recorded higher concentrations in the roots. The general results obtained revealed that the levels of Cd in dumpsite-soil were above the standard while the levels of Cd and Pb in plants were also above the recommended levels in plants. The implications of these high concentrations of these metals in soil and plants have been discussed. Some useful recommendations on the proper handling of wastes to reduce toxic metal loads at dumpsites have also been highlighted.

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“…The pH of the fly ash tends to vary from acidic to alkaline (4.5 to 12.0), depending on the source of coal and the number of trace elements in them [48]. Fly ash produced from bituminous coal, is mostly acidic even though it has higher sulfur content, while alkaline fly ash is produced from the sub-bituminous coal, which has lower sulfur content, and has higher Ca and Mg content than that derived from bituminous coal [49]. Similarly the electrical conductivity (EC) of fly ash varies between 0.177 to 14 S/m, which directly corresponds to the quantitative concentration of soluble cations and anions in the fly ash [2,50].…”

Section: Chemical Properties Of Fly Ashmentioning

confidence: 99%

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

Yadav

Fulekar

2020

Ceramics

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Fly ash or coal fly ash causes major global pollution in the form of solid waste and is classified as a “hazardous waste”, which is a by-product of thermal power plants produced during electricity production. Si, Al, Fe Ca, and Mg alone form more than 85% of the chemical compounds and glasses of most fly ashes. Fly ash has a chemical composition of 70–90%, as well as glasses of ferrous, alumina, silica, and CaO. Therefore, fly ash could act as a reliable and alternative source for ferrous, alumina, and silica. The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. Alumina extraction is possible using both alkali- and acid-based methods, while silica is extracted by strong alkali, such as NaOH. Chemical extraction has a higher yield than the biological approaches, but the bio-based approaches are more environmentally friendly. Fly ash can also be used for the synthesis of zeolites by NaOH treatment of variable types, as fly ash is rich in alumino-silicates. The present review work deals with the recent advances in the field of the recovery and synthesis of ferrous, alumina, and silica micro and nanoparticles from fly ash.

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Heavy metals release from ash pond to soil water environment: A simulated technique

Cited by 8 publications

References 7 publications

Environmental Impacts of the Coal Ash Spill in Kingston, Tennessee: An 18-Month Survey

Environmental Impacts of the Coal Ash Spill in Kingston, Tennessee: An 18-Month Survey

Heavy Metal Contents of Municipal and Rural Dumpsite Soils and Rate of Accumulation by Carica papaya and Talinum triangulare in Uyo, Nigeria

Advances in Methods for Recovery of Ferrous, Alumina, and Silica Nanoparticles from Fly Ash Waste

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