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Environment Engineering I

An-Najah National University Civil Engineering Department. Environment Engineering I. Chapter Eleven- section 3. Air Pollution. Dr. Amal Hudhud Dr. Abdel Fattah Hasan. Atmospheric Dispersion. Factors effecting Dispersion of air pollutants. Emission point characteristic

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Environment Engineering I

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  1. An-Najah National University Civil Engineering Department Environment Engineering I Chapter Eleven- section 3 Air Pollution Dr. Amal Hudhud Dr. Abdel Fattah Hasan

  2. Atmospheric Dispersion

  3. Factors effecting Dispersion of air pollutants Emission point characteristic Nature of pollutants material Metrological condition Effect of terrain and anthropogenic structure In this chapter factor 1 is considered

  4. Source characteristic • Most industrial effluent are discharge vertically into open air through stack or duct • As contaminated gas stream leave discharge point the plume tends to expand and mix with ambient air • While effluent plume, rising, bending and beginning to move horizontal, gaseous effluent are being diluted by ambient air and eventually dispersed towards the ground

  5. Source characteristic • The plume rise is affected by • Inertia of the discharge gas (related to exist gas velocity and mass) • Plumes buoyancy (related to the exist gas mass relative to the surrounding air mass) • Increase velocity or gas temperature will increase the plume rise • Effective stack height = plume rise + physical stack height

  6. Dispersion Model • Description of meteorological transport and dispersion process that is quantified in term of source and meteorological parameter during a particular time • Concentration of particular pollutant for specific location and time • Short term model • Climatologically model

  7. The model

  8. Model equations

  9. Sy and Sz • Depend on stability of atmosphere

  10. Algorithm expression for Sz, Sy

  11. Wind Speed correction

  12. Inversion aloft Plume can not disperse vertically

  13. Indoor air quality model

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