Radiological impact of coal ash from the power plants in Hong Kong

Tso, Man-Yin W.; Leung, Jkc

doi:10.1016/0140-6701(96)89214-9

Cited by 4 publications

(4 citation statements)

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“…Extensive research have been carried out to assess the radionuclide contents of coal deposits around the world [ 1 , 2 , 5 , 13 , 17 – 19 , 26 , 30 – 32 ], but information on the radioactivity of Nigerian coal is relatively limited. Yet Nigeria is endowed with abundant coal deposits with enough capacity to generate up to 30% of its energy needs.…”

Section: Introductionmentioning

confidence: 99%

Quantification and Radiological Risk Estimation Due to the Presence of Natural Radionuclides in Maiganga Coal, Nigeria

et al. 2016

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Following the increasing demand of coal for power generation, activity concentrations of primordial radionuclides were determined in Nigerian coal using the gamma spectrometric technique with the aim of evaluating the radiological implications of coal utilization and exploitation in the country. Mean activity concentrations of 226Ra, 232Th, and 40K were 8.18±0.3, 6.97±0.3, and 27.38±0.8 Bq kg-1, respectively. These values were compared with those of similar studies reported in literature. The mean estimated radium equivalent activity was 20.26 Bq kg-1 with corresponding average external hazard index of 0.05. Internal hazard index and representative gamma index recorded mean values of 0.08 and 0.14, respectively. These values were lower than their respective precautionary limits set by UNSCEAR. Average excess lifetime cancer risk was calculated to be 0.04×10−3, which was insignificant compared with 0.05 prescribed by ICRP for low level radiation. Pearson correlation matrix showed significant positive relationship between 226Ra and 232Th, and with other estimated hazard parameters. Cumulative mean occupational dose received by coal workers via the three exposure routes was 7.69 ×10−3 mSv y-1, with inhalation pathway accounting for about 98%. All radiological hazard indices evaluated showed values within limits of safety. There is, therefore, no likelihood of any immediate radiological health hazards to coal workers, final users, and the environment from the exploitation and utilization of Maiganga coal.

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Section: Introductionmentioning

confidence: 99%

Quantification and Radiological Risk Estimation Due to the Presence of Natural Radionuclides in Maiganga Coal, Nigeria

et al. 2016

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“…Radionuclide content in the tested samples does not exceed the allowance limits for building materials (Table 1). In most, the content of the radionuclides in the tested ash was lower than typical for of such materials [5,6,30,38,39]. However, in the case of fly ash from 'J' coal the results for f 1 reach the allowed limits.…”

Section: Radioactivity (Radionuclide Content)mentioning

confidence: 72%

Properties of Coal Gasification Wastes Essential to Determining Their Impact on the Environment

Pomykała¹,

Mazurkiewicz²

2015

Pol. J. Environ. Stud.

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Gasification is playing an increasingly significant role in thermal processing. The different types of solid waste generated in these processes should ultimately be treated as by-products and be used in various industries (such as fly ash from coal combustion, for example). However, studies of waste properties are needed to determine real and potential impact on the environment. The scope of our tests depends on methods and directions of planned use of waste. Our paper presents and discusses the test results of waste generated in research installations: one in a large laboratory and the second in a pilot plant. The wastes are derived from the process of direct combustion, direct gasification, and the two-stage process of coal gasification with char formation followed by combustion. All installations are based on the fluidized bed, with two hard coals and lignite used as fuel. Tested materials belong to two groups: fly ash and bottom ash. Research of the waste properties was conducted in the field of grain size distribution, chemical composition, content of combustible leaching of chemical contaminants, and radioactivity. Analysis of the results was carried out both in terms of existing legislation and also related to a comparison of properties of materials from single-stage and two-stage thermal processing.

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“…The huge quantities of ash produced by CFPPs are stored in ponds in heaps adjacent to the power plants (4,7,8) . Thus, extensive research has been conducted to evaluate the radiological impact of both the radionuclides emitted into the atmosphere and those stored in massive ash deposits (4,(9)(10)(11) .…”

Section: Introductionmentioning

confidence: 99%

Quantification of radionuclides and associated radiological risk estimation of coal combustion residues from a South African coal-fired power plant

2021

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Background: Radionuclides occur in coal combustion residues, such as fly ash and bottom ash, which are by-products of coal combustion. They pose potential radiological risks to people present in the surrounding areas. Materials and Methods: Gamma spectrometry was performed to determine the radionuclide activity concentrations in a coal-driven power plant located in the Limpopo province, South Africa, to assess the radiological impacts of the ash stored in ash dumps adjacent to the plant. Results: The mean (+ SD) activity concentrations were found to be 144.3±4, 62±2.1, and 315.9±4.9 Bq/ kg for 226 Ra, 232 Th, and 40 K, respectively, which are comparable to those found in previous studies. The radium equivalent activity was determined to be 258.43 Bq/kg. The average values of internal and external hazard indices were 1.09 and 0.70, respectively. With the exception of the internal hazard index, all the other indices were within the prescribed ranges indicated by the literature. Furthermore, the mean total annual effective dose received by plant workers was found to be 0.070 mSv/y, which is within the limit of 1.0 mSv/y prescribed by the IAEA. The average excess lifetime cancer risk value was 0.49 × 10 -3 , which is higher than the UNSCEAR precautionary limit of 0.29 × 10 -3 but lower than the ICRP limit of 0.05 for low-level radiation. Conclusion: Ash dust inhalation was identified as the most significant exposure pathway among plant workers. However, the results demonstrated that storing of ash at this plant does not constitute any radiological threat to people in the adjacent regions.

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Radiological impact of coal ash from the power plants in Hong Kong

Cited by 4 publications

References 0 publications

Quantification and Radiological Risk Estimation Due to the Presence of Natural Radionuclides in Maiganga Coal, Nigeria

Quantification and Radiological Risk Estimation Due to the Presence of Natural Radionuclides in Maiganga Coal, Nigeria

Properties of Coal Gasification Wastes Essential to Determining Their Impact on the Environment

Quantification of radionuclides and associated radiological risk estimation of coal combustion residues from a South African coal-fired power plant

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