Abstract
The paper considers the macro- and micro- element composition of two ash dumps in the Middle Urals, where meadow and forest communities have been spontaneously forming for 50 years, as well as the effect of the plants on the changing composition of the ash. Higher contents of Cu, Co, Sn, Ga, and Yb were found in the deep ash layers of both dumps, while in the upper 20-cm layer, the trace element composition depended on the influence of different plant communities. Higher contents of Sr, Cr, Ni, Sn, and Co were revealed under meadows, and Ba, Zr, and La were found under the forest. The levels of element accumulation in the aboveground and underground parts of dominant plants were revealed. Increased content of Be, Ce, Ga, La, Sc, Y, and Yb was detected in areas where meadow plants were dominant and Zn and Ba in forest areas. The toxic elements Cd and Pb were highly accumulated in both communities, whereas Co was found only in meadows. The studied materials can serve as a base to assess the feasibility of processing and/or utilizing fly ash from ash dumps in the Middle Urals and similar ash dumps in other regions situated in the southern taiga.
Highlights
The Russian Federation, like many other countries, produces electric power mainly by using solid-fuel natural resources such as brown and bituminous coals
The results show that the leaching and migration of iron oxides are extremely low, especially in the Sredneuralskaya thermal power plant (SUTPP) ash dump
The study obtained material allowing for the investigation of the macro- and micro-elemental composition of fly ash at two ash dumps, formed after the burning of high-ash brown coals from separate deposits with varying properties under the bioclimatic conditions in the Middle Urals southern taiga
Summary
The Russian Federation, like many other countries, produces electric power mainly by using solid-fuel natural resources such as brown and bituminous coals. Their share in global power production was 36.4–41% for 2000–2019 [1,2,3]. The large amount of ash and slag waste that has accumulated, and is being constantly added to, has become a problem. The question of recycling and reusing this waste as a secondary raw material has recently attracted a large amount of attention in different countries, including Russia [3,9,10,11,12,13,14,15,16,17,18,19,20,21]. Innovative approaches to use ash wastes demonstrate the possibility of achieving 100%
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