BEV
bus
CHP
CIP
CNG
NOX
ORC
RES
    Print  

ŠTERBENK, E., MAVEC, M., MLJAČ, L., DEBELJAK, B.
ENVIRONMENTAL IMPROVEMENT OF FLY ASH DEPOSITION IN THE ŠALEK VALLEY
KOMUNALNA ENERGETIKA / POWER ENGINERING, 17
The Šoštanj TPP (installed power of 809 MW) is the biggest thermal power plant in Slovenia. In the facility lignite coal from the Velenje Colliery is burned. Approximately 700 000 tonnes of fly ash results from electric power production every year. Fly ash is used for remediation of subsidence area damaged by coalmining. Fly ash was transported as slurry directly into the Lake Velenje up to 1982. After 1982 a dry landfill was constructed, while transport water still entered the lake. In 1994 the closed loop system for ash transport water was built and it has been operated since than. The previous high alkalinity of water from the Lake Velenje decreased in 3 years of operation of the closed loop system from pH over 12 to pH approximately 8. In 1995 the flue gas desulphurisation plants on unit 4 and in 2000 on the unit 5 were built. The product of desulphurisation is gypsum. Fly ash and gypsum have been mixed together as so-called stabilisat and transported to the subsidence area. The material is used for remediation of damaged area. Negative environmental impacts have been significantly reduced since the early nineties. The Šoštanj TPP management adopted an environmental improvement programme. The Velenje local community adopted a law, which required the Šoštanj TPP to reduce the degree of pollution from fly ash landfill. An ecological monitoring programme for solid waste disposal started in 1996 and has been performed on a regular yearly basis. It covers the most important pathways, so it comprises measurements of air, surface and underground water, water sediments, soil, and some vegetation. The results show very locally limited environmental impacts. The main impact has been observed in the surface water. In the early nineties of the 20th century the area used to be an ash dump. Over last two decades it has become a well-maintained site of remediation. The major part of site is grassed and partly used as a recreational area, although works are still in process.

  HOME MEETING SCHEDULE CONTENT PRESENTATION ARCHIVE E-REGISTRATION