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• W64526110 abstract "The safe disposal of coal ash produced from power stations involves the assessment of rates of production and quality of ash leachate. Laboratory column experiments have been used to obtain data on the ash leachate. The extrapolation of this data to the field conditions requires theoretical modelling of the underlying chemical leaching and transport mechanisms. In the current paper, a model was developed to simulate the leaching of ash which exists in saturated or near-saturated conditions. The model was applied to simulate the experimental results, and good agreement was obtained between the experimental and model results. In the Latrobe Valley region of Victoria Australia, large quantities of brown coal ash are produced annually in the power station complexes which supply the majority of the electricity requirement for Victoria. One of the principal environmental concerns associated with the management of these facilities is the hydrogeological impact of the disposal of coal ash. Currently, all coal ash produced by the power stations is slurried to on-site disposal ponds. Since the capacity of the ash ponds is limited, options for the future management of the ash ponds are considered, and the feasibility of depositing of aged ash in a nearby overburden dump is investigated. In the environmental impact assessments of the ash disposal strategies, assessment of the leaching of some chemicals from the ash is essential. The current paper relates to chemical leaching of coal ash which exists under saturated or near-saturate d conditions as would be found in disposal ponds. There has been considerable research undertaken on Latrobe Valley brown coal ash, and the early research was predominantly concentrated on solving problems in transport pipes such as scaling, or on predicting ash quality based on coal quality. Deed (1981) reported early research on ash leaching on the basis of field experiments, but the interpretation of results was difficult owing to poor experimental design and lack of detailed chemical analyses of ash and leachate. Subsequently, Black (1990a, 1990b) undertook a study comprising a series of column and sequential batch leaching tests under controlled laboratory conditions. This study was targeted to investigate the chemical leachate quality simulating more closely those expected in the ash ponds. Laboratory experiments using small columns have generated data on leachate quality and production rates in small columns. A basis to extrapolate this data to the field conditions is then required. For example, one may want to assess the quality and production rates of leachate at the base of an ash pond on the basis of experimental findings. For this purpose, Black (1990a) has used the linear transformation of the leaching rates relative to the height of the leaching mass. This approach is elementary and ignores the influence of all the dominant variables involved. In the current paper, a theoretical model for the coal ash leaching is developed, and a numerical scheme to solve the governing equations under given boundary conditions is presented. Numerical simulations were carried out to compare the model and experimental results." @default.
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• W64526110 date "1997-01-01" @default.
• W64526110 modified "2023-09-26" @default.
• W64526110 title "Modelling of Coal Ash Leaching" @default.
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