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   Dispersion from stacks  

The dispersion in the atmosphere, of light gases emitted from elevated vertical sources, ie. stacks, was studied. As a result, a user-friendly graphical software employing a microscale Gaussian model based on the I.S.C. (Industrial Source Complex Model), which is approved by the E.P.A. (Environmental Protection Agency, U.S.A), was produced.


Characteristics
- dispersion of light gases ie CO, SO2
- gas emitance simultaneously
from 1-9 stacks
- flat rural terrain
- full meteorological data can be
applied
- 4 scale map (user configured)

Application
- Hellenic Petroleum Company S.A.,
Thessaloniki
- TITAN Cement Company S.A.,
Thessaloniki

Future Aspects
- small obstacles (hills)
- import from GIS data
- ESRI ArcView extension pack

   Heavy gas toxic dispersion  

For the dispersion of heavy gases in the atmosphere, the software developed was based on the SLAB model. SLAB is approved by E.P.A. (Environmental Protection Agency, U.S.A), and treats denser-than-air releases, including ground level and elevated jets, liquid pool evaporation, and instantaneous volume sources. The developed software runs in real time in a graphical user-friendly environment.


Characteristics
- dispersion of heavy gases
i.e. CNCl or vapours i.e. VX
- 4 releases scenarios and explosion scenario
- properties database for large number of
gases and liquids
- 4 scale map (user designed or picture formatted)
- help included

Application
- Ministry of National Defense


   Dispersion from mines  



The case of AMYNDAION MINES

The particular work addressed the problem of atmospheric dispersion of particulate matter (PM) from the overburden dumps of a mine, using a commercial CFD software, includingmost of the complex physical phenomena in atmospheric diffusion. In the vicinity of the city of Amyndaion there is a large mine that provides lignite for the thermal power stations of the Hellenic Public Power Corporation. The excavated land is dumped in nearby open pits, which are planned to be extended Southern. These pits are sources of air-suspended particulate matter that can affect the nearby residential areas.

A numerical model was employed to simulate the present and future state of the overburden dumps. The results for various dispersion scenarios were compared with the estimations of empirical models, recommended by U.S. Environmental Protection Agency (EPA). The calculated results confirmed the increased impact to health if the dump site moves Southern.

The work is a clear example of the successful use of a complex numerical model in an environmental study.

 

Index

19ectp

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