The document discusses factors that influence the dispersion of pollutants emitted from point sources like smokestacks. Plume rise and effective stack height affect how far pollutants are transported and the maximum ground-level concentrations. Stability conditions like stable, unstable, or neutral atmospheres also impact plume behavior, with stable conditions resulting in less dispersion. Terrain features such as valleys, buildings, and heat islands can trap pollutants by disrupting airflow or enhancing thermal inversions. Long-range transport of pollutants over hundreds or thousands of miles is possible if they enter the free troposphere and undergo planetary-scale mixing.
The Gaussian plume model is the most common air pollution model. It is based on a simple formula that describes the three-dimensional concentration field generated by a point source under stationary meteorological and emission conditions.
Transport of Pollution in Atmosphere: Plume behaviour under different atmospheric
conditions, Mathematical models of dispersion of air pollutants, Plume behaviour in valley and terrains. Plume behaviour under different meteorological conditions, Concept of isoplates
History of Air pollution and episodes, Sources of air pollution and types, Introduction
to meteorology and transport of air pollution: Global winds, Headley cells, wind rose terrestrial wind profile, Effects of terrain and topography on winds, lapse rate, maximum mixing depths, plume rise
The Gaussian plume model is the most common air pollution model. It is based on a simple formula that describes the three-dimensional concentration field generated by a point source under stationary meteorological and emission conditions.
Transport of Pollution in Atmosphere: Plume behaviour under different atmospheric
conditions, Mathematical models of dispersion of air pollutants, Plume behaviour in valley and terrains. Plume behaviour under different meteorological conditions, Concept of isoplates
History of Air pollution and episodes, Sources of air pollution and types, Introduction
to meteorology and transport of air pollution: Global winds, Headley cells, wind rose terrestrial wind profile, Effects of terrain and topography on winds, lapse rate, maximum mixing depths, plume rise
Meteorological Factors Influencing Air Pollution And Atmospheric Stability ...NiranjanHiremath12
1. Meteorology2.Air Pollution Meteorology3.Benefits Of Analyzing Meteorological Data
4. Meteorological Factors Influencing Air Pollution
4.1 Primary parameters
4.1.1 Wind Direction And Speed
4.1.2 Temperature inversion
4.1.3 Atmospheric Stability
4.1.4 Mixing Height or Mixing Depth
4.2 Secondary parameter
4.2.1 Precipitation
4.2.2 Humidity
4.2.3 Solar radiation
4.2.4 Visibility
5. Methods for measurement of meteorological variable
6. Lapse Rate in Air Pollution Meteorology
7. Atmospheric Stability
7.1 Super Adiabatic
7.2 Sub Adiabatic
8. Plume Behaviours
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Hence, this PPT can be very effective way of studying and analysing this Topic
AIR POLLUTION CONTROL course material by Prof S S JAHAGIRDAR,NKOCET,SOLAPUR for BE (CIVIL ) students of Solapur university. Content will be also useful for SHIVAJI and PUNE university students
Lecture note of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
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Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur
Lecture note of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
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Prof S S Jahagirdar,
Associate Professor,
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Air Pollution control- at source-equipments for control of air pollution-For particulate matter-Settling chambers-Fabric filters-Scrubbers-Cyclones-Electrostatic precipitators
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Meteorological Factors Influencing Air Pollution And Atmospheric Stability ...NiranjanHiremath12
1. Meteorology2.Air Pollution Meteorology3.Benefits Of Analyzing Meteorological Data
4. Meteorological Factors Influencing Air Pollution
4.1 Primary parameters
4.1.1 Wind Direction And Speed
4.1.2 Temperature inversion
4.1.3 Atmospheric Stability
4.1.4 Mixing Height or Mixing Depth
4.2 Secondary parameter
4.2.1 Precipitation
4.2.2 Humidity
4.2.3 Solar radiation
4.2.4 Visibility
5. Methods for measurement of meteorological variable
6. Lapse Rate in Air Pollution Meteorology
7. Atmospheric Stability
7.1 Super Adiabatic
7.2 Sub Adiabatic
8. Plume Behaviours
Effective Techniques to control gaseous & particulate pollutionShristi Soni
This powerpoint has been made in context to briefly describe about the congtrol methods for gaseous and particulate pollution. This Presentation also briefly describes about the control devices seperately for Gaseous pollution as well as Particulate Pollution.
Hence, this PPT can be very effective way of studying and analysing this Topic
AIR POLLUTION CONTROL course material by Prof S S JAHAGIRDAR,NKOCET,SOLAPUR for BE (CIVIL ) students of Solapur university. Content will be also useful for SHIVAJI and PUNE university students
Lecture note of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur
Lecture note of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur
Air Pollution control- at source-equipments for control of air pollution-For particulate matter-Settling chambers-Fabric filters-Scrubbers-Cyclones-Electrostatic precipitators
, For Gaseous pollutants-control by absorption-adsorption-scrubbers-secondary combustion after burners, Working principles advantages and disadvantages
Phosphine gas in the cloud decks of VenusSérgio Sacani
Measurements of trace gases in planetary atmospheres help us explore chemical conditions different to those on Earth. Our
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The overtopping flow of water over an earthen embankment causes erosion of soil from its surfaces and the eroded surface of the embankment acts as a Broad crest weir. But the longitudinal profile of the weir goes on changing with time of erosion. Hence crest height of the weir goes changing in accelerated flow condition. In this paper, the discharge equation for this type of flow situation is established for different types of soils used in the embankment. Then, the experiments have been carried out as the analogous rigid beds of the captured eroded profiles at any time of erosion of the broad crested weir to compare the discharge equation and to study the energy loss in dislodging the soil from the surface of the weir and transporting them down stream.
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Plume characteristics
1. Dispersion from Point Sources
• Pollutants emitted in plume form
Why does plume expand downwind?
What are the factors that influence the
history of plume?
www.epa.gov/.../muncpl/landfill/s
w_combst.htm
Impact on air quality depends on
dispersion, which depends on the
height of plume
03/30/13 Aerosol & Particulate Research Lab 1
2. • Plume rise affects transport
– Effects maximum ground level concentrations (MGLCs)
– Effects distance of MGLCs
www.atmos.ucla.edu/.../ch
imneyplumes/Note03.html
Under what conditions can we have a higher Effective
Stack Height?
03/30/13 Aerosol & Particulate Research Lab 2
3. Stack Plume: Looping
Strong turbulence
http://www.uwm.edu/~kahl/CoVis/Plume/stable.gif
Q: Is it at stable or unstable condition? High or low wind speed?
Does it happen during the day or night?
Is it good for dispersing pollutants?
03/30/13 Aerosol & Particulate Research Lab http://www.med.usf.edu/~npoor/3 3
5. Stack Plume: Coning
Strong wind, no turbulence
What is the stability class? Good vertical mixing?
On sunny or cloudy days?
Good for dispersing pollutants?
What is the ground level concentration as a function of
distance from the stack?
03/30/13 Aerosol & Particulate Research Lab 5
7. Stack Plume: Fanning
http://www.med.usf.edu/~npoor/4
Q: What is the stability class?
What is the top view of the plume?
What is the ground level concentration as a function of
distance from the stack?
03/30/13 Aerosol & Particulate Research Lab 7
9. Stack Plume: Fumigation
Q: Why can’t the pollutants be dispersed upward?
Does it happen during the day or night?
What’s your opinion about requiring power plants to reduce
their power output from 3 am to 3 hours after sunrise?
What is the ground level concentration as a function of
distance from the stack?
03/30/13 Aerosol & Particulate Research Lab 9
10. 03/30/13 Aerosol & Particulate Research Lab 10
11. Stack Plume: Lofting
Q: Why can’t the pollutants be dispersed downward?
When does it happen?
Lofting is a transition stage. To which type of plume?
What is the ground level concentration as a function of
distance from the stack?
03/30/13 Aerosol & Particulate Research Lab 11
12. 03/30/13 Aerosol & Particulate Research Lab 12
13. Stack Plume: Trapping
Q: What is the stability class?
What is the ground level concentration as a function of
distance from the stack?
http://www.uwm.edu/~kahl/CoVis/Plume/
03/30/13 Aerosol & Particulate Research Lab 13
14. Effect of Surface Discontinuity
(a)
(b)
Warm land Cold water
(c)
Warm land Cold water
Cold land Warm water
Q: What is the ground level concentration as a function of
distance from the stack?
03/30/13 Aerosol & Particulate Research Lab 14
15. 03/30/13 Aerosol & Particulate Research Lab 15
16. Effects of Terrain on the Plume Pattern
Q: Does the shape of the building matter?
Is the wake bigger at stable or unstable condition?
03/30/13 Aerosol & Particulate Research Lab 16
17. Impact of Building and Stack Location
Backwash
Downwash
Q: Is stack height an important parameter?
03/30/13 Aerosol & Particulate Research Lab 17
18. Impact of Stack Height: Stack Upwind of Building
03/30/13 Aerosol & Particulate Research Lab 18
19. Impact of Stack Height: Building Supported Stack
03/30/13 Aerosol & Particulate Research Lab 19
20. Impact of Stack Height: Stack Downwind of Building
Conclusions?
03/30/13 Aerosol & Particulate Research Lab 20
22. Plume Affected by Natural Terrain Irregularity
03/30/13 Aerosol & Particulate Research Lab 22
23. Plume Near Very Large Obstacle
Unstable Stable
03/30/13 Aerosol & Particulate Research Lab 23
24. Plume in a Valley
03/30/13 Aerosol & Particulate Research Lab 24
25. Heat Island Effect
Q: When does the effect break?
03/30/13 Aerosol & Particulate Research Lab 25
26. Plume Affected by Heat Island Effect
Toward a city Within a city
03/30/13 Aerosol & Particulate Research Lab 26
27. Long-Range Transport
• Transport of pollutants hundreds/thousands of miles;
resulting in air quality problems far away from the source
Examples?
Planetary Transport
• Stable air above PBL retards vertical mixing
• Transport out of PBL to free troposphere takes few hours
to few days
• Transport to top of troposphere with uniform mixing takes
about a week (for long-lived pollutants, e.g. CO2, CH4,
CFC)
Why only long-lived?
03/30/13 Aerosol & Particulate Research Lab 27
28. Summary
Take 2 minutes to summarize here what you have learned from this section
03/30/13 Aerosol & Particulate Research Lab 28
Editor's Notes
Why plume expands: concentration and temperature gradients The history of plume depends on: Physical/chemical nature of pollutants (e.g. particle size, reaction rate in the atmosphere (NO2)); Meteorological factors (rainy vs clear day, windy vs calm day); Location of source relative to potential obstructions (i.e. dispersion and dilution); Topography (flat plain vs valley or mountain or buildings)
Higher Effective Stack Height: taller stack, lower wind speed, higher stack gas temperature and exit velocity
Unstable. Calm wind. During daytime. Good for dispersing pollutants.
Stability class: Neutral to isothermal lapse rates Good for dispersing pollutants. Cloudy or windy days or at night Little vertical mixing
Stability class: Formed under ground- based inversion conditions (stable) Top view: Expands horizontally but not vertically Low ground level concentration.
Inversion layer above During the day after sunrise Ground level concentration is zero for some distance, then peaks and then decreases. Good because that’s when ground level concentration is higher.
Ground level inversion layer. Late afternoon or early evening under clear skies (if the stack is tall). Transition to fanning. Ground level concentration: 0.
Wake is smaller for round than for square. Turbulent mixing at unstable condition can destroy the wake.
Conclusion: The higher the stack height, the better the dispersion. Stack downwind better than upwind of building. Generally, the stack should be twice high of the building.
Stack downwash: stack exit velocity is low compared to the wind velocity.
In a valley, the streamline remains straight, but lateral diffusion is suppressed in the vicinity of the valley walls. In the beginning at point (a), the plume follows the regular pattern. When the plume reaches the wall,. It becomes confined. So, the concentration along the walls increases very fast, and the available valley volume is filled with stack effluent.
Acid deposition Elevated rural O3 levels Arctic Haze Movement of long-lived pollutants Why only long-lived? Ans: short-lived are consumed/reacted.