Abstract
The use of waste in land reclamation projects or road works is a generally applied method of waste recycling since coal bottom ash can be used in plant substrate. This paper presents the results of research on the physical and chemical properties and the toxicity of waste originating from power stations, in the form of coal bottom ash collected from pulverisedfuel and fluidised-bed boilers. To evaluate the eco-toxicological properties of waste, a series of plant growing tests were conducted, with the use of selected plant species, as well as germination tests in water extracts of waste. The latter were intended to determine whether coal bottom ash displayed cytostatic activity, while, in the case of pot experiments, the purpose was to determine the germination rates and growths of both above-ground and underground parts of plants. The test results indicated that the influence of the tested coal bottom ash on the plant development and growth depended on physical and chemical properties of that waste. The reactions of plants were also changing depending on the proportion of waste in soil.
Highlights
The production of electrical and thermal energy from coal is associated with the generation of various types of waste that is generally called a side product of fuel burning
The chemical composition was determined by using mass spectrometer with inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES), a leaching test was conducted according to Standard EN 12457-2
This paper presents the results of the experiments concerning the evaluation of the properties of bottom ashes originating from coal burning in fluidised-bed and pulverised-fuel boilers, with the intention to use ashes in nature
Summary
The production of electrical and thermal energy from coal is associated with the generation of various types of waste that is generally called a side product of fuel burning Such products include bottom ashes, fly ashes, fly and bottom ash mixes, and the residues of exhaust-gas purification processes. What is decisive for the selection of the management method of the side products of fuel burning is primarily their physical and chemical properties Those properties depend on a number of factors, e.g. type of coal, co-burning of biomass or other waste fuels, type of furnace, or exhaust-gas treatment methods, as described in many publications [1, 2, 3, 4, 5]. The majority of the minerals contained in coal are melted in a pulverised-fuel boiler, while small particles of the liquid
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