Opportunities and challenges in the use of coal fly ash for soil improvements – A review

Shaheen, Sabry M.; Hooda, Peter S.; Tsadilas, Christos

doi:10.1016/j.jenvman.2014.07.005

Cited by 255 publications

(103 citation statements)

References 199 publications

(322 reference statements)

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“…The use of coal ash in agriculture has received great attention during the last four decades (Shaheen et al, 2014). This subproduct has been used as a source of essential nutrients for plants (Ram et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization in an Alfisol amended with thermoelectrical industry by-products

Fernández¹,

Stolpe²,

Celis³

et al. 2017

Chil. j. agric. res.

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In thermoelectric industry, synthetic gypsum and coal ash are generated as industrial by-products. The objective of this work was to evaluate the effect of different mixtures of synthetic gypsum and coal ash on N mineralization in an Alfisol. Nitrogen mineralization was evaluated by soil incubations under controlled conditions and potential mineralization using the nonlinear first order kinetics model Nm t = N 0 [1 -℮ (-kt) ], where Nm t is the mineral N accumulated at a specific time, N 0 is the potentially mineralizable N, k is the mineralization rate, and finally t is the incubation time. Treatments consisted of different mixtures of synthetic gypsum, coal ash and urea (M 1 : 50% synthetic gypsum, 50% coal ash, M 2 : 50% synthetic gypsum, 35% coal ash, 15% urea, M 3 : 45% synthetic gypsum; 40% coal ash, 15% urea, M 4 : 65% synthetic gypsum, 20% coal ash, 15% urea, M 5 : 55% synthetic gypsum, 30% coal ash, 15% urea). Each mixture was applied to the soil at 2 t ha ). Where the highest and lowest k were determined in M 5 (k = 0.44990) and M 3 (k = 0.04470), respectively. Mixtures of synthetic gypsum, coal ash and urea increased N mineralization over mixtures without urea. Respect N potential mineralization, in some cases N 0 and k values would respond more to the fit of the mathematical model employed than to the biological process.

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Section: Introductionmentioning

confidence: 99%

Nitrogen mineralization in an Alfisol amended with thermoelectrical industry by-products

Fernández¹,

Stolpe²,

Celis³

et al. 2017

Chil. j. agric. res.

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“…Pandey and Singh (2010) reported as many as 100 million tons were generated in China for 2005 and only 45% of them were utilized. In China the same installed capacity as those for the whole 20 th century would be completed in next 20 years (Shaheen et al, 2014). Although the part of this increased demand would be met by renewable resources, coal is still the dominant fuel for power generation in China and India (Lior, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Some recycling methods of CFA have been reported in recently documents (Blissett and Rowson, 2012;Shaheen et al, 2014). The CFAs can be used as a soil amendment, catalysts and catalyst supports, or used in concrete and cement manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Characterization of PAHs and PCBs in Fly Ashes of Eighteen Coal-Fired Power Plants

Chen

Liu

et al. 2016

Aerosol Air Qual. Res.

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For the management of coal fly ashes (CFAs) from coal-fired power plants (CFPPs), characterization of PAHs and PCBs in CFAs is imperative. The 18 PAH and 86 PCB congeners in CFAs collected from 18 large-scale CFPPs in China were detected using GC/MS system. The PAH concentrations were in the range of 5.51-70.9 ng g -1 for 16 CFPPs with individual block power capacity as 600 MW (IBPC-600), significantly lower than 886-916 ng g -1 for 2 CFPPs with IBPC as 200 and 300 MW (IBPC-200/300). Both PAH and PCB congeners for 18 CFPPs were dominated by low molecular weight ones. The 3-and 2-ring PAHs, di-, tri-and tetra-PCBs were the predominant homologs. PAH profiles for 16 CFPPs with IBPC-600 were significantly different from other industrial stacks based on higher coefficients of divergence. The BaP-based toxic equivalency (BaPeq) concentration and BaP-based equivalent carcinogenic power (BaPE) for 16 CFPPs with IBPC-600 were 0.834 ng g -1 and 0.570, much lower than corresponding 20.5 ng g -1 and 15.4 for 2 CFPPs with IBPC-200/300. No difference existed for Σ 86 PCBs between CPFFs with IBPC-600 and -200/300, which ranged from 9.60 to 32.1 ng g -1 . Higher mean carcinogenic PAH concentrations for 2 CFPPs with IBPC-200/300 and PCBs-TEQ concentration for 18 CFPPs indicated the application of CFAs as soil amendment should be prohibited. The PAH concentrations for 18 CFPPs were well correlated with the total organic carbon (TOC) values, while PCB concentrations showed not this trend, indicated the different formation mechanism between PCBs and PAHs.

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“…In the past several decades, China strengthened the construction of infrastructure and thereof a lot of CFA was consumed. In the agriculture field, in virtue of its special physical properties like water holding capacity, bulk density, pH etc., and containing almost all the essential plant nutrients, fly ash is used to improve the soil physic-chemical characteristics and increase the output and qualities of the plants [5]. But CFA contains number of toxic heavy metals and also have natural radioactivity materials in it.…”

Section: B a Brief Description Of Cfa Utilizationmentioning

confidence: 99%

Challenges and Developments in the Utilization of Fly Ash in China

Ma¹,

Xu²,

Qiqige³

et al. 2017

IJESD

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Abstract-China's coal-fired power plants produce about 600 million tons fly ash annually, which has caused severe economic and environmental problems. This paper first describes briefly the production and utilization status of coal fly ash in China. Then it analyzes the main challenges to the fly ash utilization in China due to the conflict between the huge amount production of fly ash and the depressed consumption of fly ash, as well as the increasing driving forces in the environmental protection. Subsequently, the new developments of fly ash utilization in China, including valuable elements extraction, geopolymer production, fly ash-based ceramics synthesis and soil desertification control are introduced in detail.

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Opportunities and challenges in the use of coal fly ash for soil improvements – A review

Cited by 255 publications

References 199 publications

Nitrogen mineralization in an Alfisol amended with thermoelectrical industry by-products

Nitrogen mineralization in an Alfisol amended with thermoelectrical industry by-products

Characterization of PAHs and PCBs in Fly Ashes of Eighteen Coal-Fired Power Plants

Challenges and Developments in the Utilization of Fly Ash in China

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