Prediction of transboundary pollution of air and soil in Odesa region by fly ash from Moldavian SDPP
DOI:
https://doi.org/10.15276/opu.1.71.2025.14Keywords:
fly ash, transboundary pollution, soil pollution, fractional compositionAbstract
Since at present, due to the lack of gas, a large energy enterprise Moldavian SDPP has returned to the use of solid fuel (coal), the problem of fly ash pollution of the territory of Odesa region has become relevant again. The article proposes a method for calculating the dispersion of solid particles with a shape close to spherical on the soil surface on the example of transboundary pollution of Odesa region by fly ash from power boilers of the Moldavian SDPP. In contrast to the current UND-86 standard, the method uses the general laws of aerodynamics and is based on determining the settling velocity of solid particles. It has been shown that, although fly ash from pulverised coal boilers consists of a large number of different substances, the bulk of it is silica, aluminium, iron and calcium oxides. They differ in fractional composition and material density. The proposed method takes this difference into account and allows predicting the coordinates of fly ash particles of a particular material and a certain size falling on the soil. The calculations showed that the chemical composition of soil pollution varies along the smoke plume line, with iron oxides predominating in the northern part of Odesa district and silicon dioxide in the immediate vicinity and in Odesa city. Due to the lack of reliable data on the fractional composition of fly ash from Moldavian SDPP, only an approximate estimate of dispersion was possible. However, even such estimates allowed us to conclude that ash particles spread much deeper into the territory of Odesa Oblast than according to the results of the UND-86. This is the basis for revising this methodology in terms of calculating the dispersion of fly ash from thermal power plants.
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