ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2020): 0.934

PROPERTIES AND ENVIRONMENTAL IMPACT OF OIL SHALE ASH LANDFILLS; pp. 257–270

Full article in PDF format | https://doi.org/10.3176/oil.2019.2.01

Authors
TÕNU PIHU, ALAR KONIST, ERIK PUURA, MARTIN LIIRA, KALLE KIRSIMÄE

Abstract

Estonia’s basic power supply is covered mainly by oil shale-fired thermal power plants. The pulverized combustion (PC) and circulating fluidized bed combustion (CFBC) technologies are used. The power plant exploitation has revealed the emission of gaseous pollutants, as well as ash handling problems. The hydro ash removal is used at large power plants in Estonia. An overview of the formation and properties of oil shale ash is given. The polluting impact of ash in contact with water is analyzed. Taking into account precipitation and evaporation conditions the amount of water bound by ash as well as ash field water balance is given. The leaching behaviour of oil shale ash is analyzed. The analysis of the ash field structure shows that the degree of water penetration of the ash field body meets the requirements for hazardous waste landfills. The water permeability through dense layers ranges from 0.15 × 10–9 to 16.1 × 10–9 m/s.


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