Radioenvironmental survey of the Megalopolis power plants fly ash deposits

Karangelos, D.J.; Rouni, P.K.; Petropoulos, N.P.; Anagnostakis, M.J.; Hinis, E.P.; Simopoulos, S.E.

doi:10.1016/s1569-4860(04)07126-8

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Naturally occurring radioactivity concentrations in lignite used in Thermal Power Plants (TPP) in Greece and the produced fly ash and bottom ash have already been determined since the 1980s [6][7][8]. These concentrations are generally high, especially in the case of lignite coming from mines in the Megalopolis Peloponnese area, where the concentration for radioisotopes of the 226 Ra chain is found to be about 1 kBq/kg [6][7][8][9][10][11][12]. As has been already discussed [8], there have been significant differences in the results of various studies relative to the concentration of naturally occurring radioisotopes in lignite-produced fly ash.…”

Section: Introductionmentioning

confidence: 99%

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

Gavela,

Papadakos

2023

Eng

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According to 2013/59/Euratom Directive, the activity concentration index (ACI) is required to be estimated for each building material that is of concern from a radiation protection point of view. This index applies to building materials and not to constituents that cannot be used as building materials themselves. Fly ash is a byproduct of coal-fired power plants and is one of the main constituents of cement. The radioactivity in fly ash that is produced by Greek lignite power plants cannot be considered insignificant. For example, in the case of the Megalopolis power plant, the concentration for radioisotopes of the 226Ra chain is found to be about 1 kBq/kg. Since natural radionuclide concentrations, which are harmful to human health in terms of radiation exposure, exist in fly ash, ACI should be assessed for building materials containing fly ash. The present study evaluates the ACI of concrete containing fly ash cement when used in multistory residential buildings. Results showed that cement produced in Greece by the three main Greek cement production plants, containing lignite fly ash, and used as a material for concrete multistory constructions, should not be considered as “of concern from a radiation protection point of view”. Each country that wishes to evaluate the use of fly ash into constructions should repeat the method for the ACI uncertainty budget proposed in this study, to assess whether it significantly exceeds the reference value (whether it is of concern from a radiation protection point of view).

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Section: Introductionmentioning

confidence: 99%

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

Gavela,

Papadakos

2023

Eng

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“…The elemental concentration of the ash is highly variable and is mainly dependent on the coal type. The environmentally significant component of ash is the inorganic fraction, inherited from coal, like the primordial radionuclides (238U, 232Th and 40K), different trace elements (TEs) and rare earth elements (REEs).The partitioning behaviour of these elements play a major role in deciding the environmental impact of the ash (especially for concentration of radon, thoron and associated radiation doses) [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

A GIS Based Approach for Radiation Risk Assessment Around a Thermal Power Plant Towards Adopting Remedial Measures

Parial

Mukherjee

Ghosh

et al. 2018

Preprint

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Coal combustion in thermal power plants releases ash. Ash is reported to cause different adverse health hazards in humans and other organisms. Owing to the presence of radionuclides, it is also considered as a potential radiation hazard. In this study, based on the surface radiation measurements and relevant ancillary data, expected radiation risk zones were identified with regard to the human population residing near the Thermal Power Plant. With population density as the risk determining criteria, about 20% of the study area was at ‘High’ risk and another 20% of the study area was at ‘Low’ risk zone. The remaining 60% was under medium risk zone. Based on the findings remedial measures which may be adopted have been suggested.

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“…Atualmente as empresas depositam esse resíduo em terrenos licenciados por órgãos ambientais, mas estas áreas são limitadas. Outra alternativa de destinação adequada consiste na disposição em aterros industriais, uma vez que as cinzas pesadas são classificadas como um resíduo sólido de classe IIA (ABNT 10004), o que acaba onerando os custos de processamento nas empresas cerâmicas [8][9][10]. Com base neste cenário, a incorporação da cinza pesada na massa cerâmica utilizada para a fabricação de revestimentos cerâmicos apresenta-se como uma alternativa bastante atraente, uma vez que esta iniciativa confere uma destinação adequada ao resíduo em questão e minimiza os custos operacionais por substituir matéria-prima no processo.…”

Section: Introductionunclassified

Avaliação das propriedades físicas de revestimentos cerâmicos produzidos com resíduo da indústria cerâmica (cinza pesada de carvão mineral)

et al. 2015

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A cinza resultante da queima do carvão mineral pulverizado é um dos resíduos gerados pelas empresas produtoras de materiais cerâmicas. Quimicamente, é constituída de uma ampla mistura de óxidos, sendo os majoritários Al 2 O 3 , SiO 2 e Fe 2 O 3 e outros menores como CaO, MgO, sulfatos e outras combinações. Atualmente, em muitas empresas, a cinza produzida é aterrada em áreas licenciadas por órgãos ambientais. Com o ritmo acelerado de produção de revestimentos cerâmicos e em virtude da sua limitada vida útil é necessário a utilização de outros locais, adequados, para deposição das cinzas, medida que provoca um gasto mensal elevado. Diante deste cenário, a adição de cinza à matéria-prima, além de diminuir o impacto ao meio-ambiente, pode propiciar uma redução geral de custos, tanto pelo barateamento da produção, como pela diminuição daquantidade de cinzas a serem aterradas. Desta forma, o objetivo deste trabalho foi avaliar as propriedades físicas de revestimentos cerâmicos produzidos com a adição de cinza pesada de carvão mineral. Para sua realização, corpos de prova foram confeccionados com adição de 1 a 30% de cinza em base mássica. Os corpos de prova foram armazenados dentro de placas refratárias e queimados em forno túnel a uma temperatura de 1084ºC em um ciclo de 29 horas. Foram analisados parâmetros físicos para a barbotina e corpo de prova pós-queima. Os resultados obtidos foram comparados com os padrões estabelecidos pela norma NBR 13818. Foi demonstrado que os experimentos realizados com adição de 1 a 10 % de cinza apresentaram-se dentro dos padrões estipulados pela norma. Para porcentagens de cinza adicionada acima de 4 %, alguns valores estiveram fora dos padrões, sendo a formação de "coração negro" o parâmetro que mais se afastou das exigências da norma em questão.Palavras-chave: cinza, revestimentos cerâmicos, propriedades físicas. ABSTRACTThe ash is a solid waste generated in ceramic processing, being one of the outcomes of burning pulverized coal. The chemical composition of ash consists of a mixture of oxides, especially Al 2 O 3 , SiO 2 and Fe 2 O 3 , and other species like calcium, magnesium, sulfates or other combinations. In many companies, the residual ash is transported to landfills, which are licensed by environmental agencies. With the increasing current production of ceramic tiles, the landfills have a limited lifetime, so the companies must search for other expensive alternatives for ash deposition. Henceforth, the addition of ash to the raw material, besides contribution to reduction of the environment impact, may also reduce the total costs, by decreasing the amount of raw material demanded in process and the amount of residual ash to be deposed. So, the objective of this study was to

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Radioenvironmental survey of the Megalopolis power plants fly ash deposits

Cited by 7 publications

References 6 publications

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

Activity Concentration Index Values for Concrete Multistory Residences in Greece Due to Fly Ash Addition in Cement

A GIS Based Approach for Radiation Risk Assessment Around a Thermal Power Plant Towards Adopting Remedial Measures

Avaliação das propriedades físicas de revestimentos cerâmicos produzidos com resíduo da indústria cerâmica (cinza pesada de carvão mineral)

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