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
Air Quality Sampling and Monitoring: Stack sampling, instrumentation and methods of analysis of SO2, CO etc, legislation for control of air pollution and automobile
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pollution
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The attached powerpoint presentation contains information about the Control of Particulate Contaminants. It is very useful for students studiying Air Pollution and Control Engineering either as an Open elective or Professional elective.
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
It will guide to about the air sampling process which is essential step before you proceed for any type of research regarding air pollution, pollutants and health effects.
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
Transport of Pollution in Atmosphere: Plume behaviour under different atmospheric
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History of Air pollution and episodes, Sources of air pollution and types, Introduction
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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
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
It will guide to about the air sampling process which is essential step before you proceed for any type of research regarding air pollution, pollutants and health effects.
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
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
Lab manual for Air Pollution Sampling and Analysis.
This laboratory manual is useful to environmental engineers, scientists, undergraduate and graduate students, chemists and environmental field engineers. The manual has been prepared as per the US EPA and IS standards
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.
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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Associate Professor,
N K Orchid College of Engg and Technology,
Solapur
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Solapur
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Associate Professor,
N K ORchid College of Engg and Tech,
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Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur
Lecture notes 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 notes 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
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2. Instruments needed for
sampling
Sr.
No
Parameter Instrument
used
Measuring unit
1
Temperature Thermometer
0C
2
Wind speed Anemometer
m/sec
3
Relative
humidity
Arm.
pressure
No unit (Expressed
in percentage)
Millibars or mm of
Hg
4
Page 2
Hygrometer
Barometer
15-10-2013
3. The Aim of Sampling:
•The principal requirement of a
sampling system is to obtain a sample
that
is
representative
of
the
atmosphere at a particular place and
time and that can be evaluated as a
mass or volume concentration.
•The sampling system should not alter
the
chemical
or
physical
characteristics of the sample in an
undesirable manner.
4. The major components of most
sampling systems are:
1) An inlet manifold
2) An Air mover (Blower)
3) A collection medium
4 ) Flow measurement device
5. (1)The
inlet
manifold
transports
the
material from the ambient atmosphere to
the collection medium or analytical
device in an unaltered condition, all inlet
of ambient air must be rainproof.
(2)The air mover (Blower) provides the force
to create a vacuum or lower pressure at
the end of the sampling system (pumps).
6. (3) The collecting medium, may be
solid
or
liquid
sorbent
for
dissolving gases a filter surface for
collecting particles.
(4)The flow device measures the
volume of air associated with the
sampling system.
8. • Gravitational method
• For collecting dust particles of 1µ
(micron) or larger 40 µ (micron ) in
the atmosphere, clean glass jars are kept
in the area where dust fall is to be
determined and after a few hours or days,
the dust is collected from each jar and
then weighed.
• The average weight of dust in each jar
is estimated and the dust fall is
expressed as weight of dust per unit
area per unit time.
Page 8
15-10-2013
9. • Containers, generally conical plastic jars,
10-15 cm in diameter, open at the top
are used.
• The jars are kept in strategic locations
throughout a community or in the vicinity
of particulate sources under study.
• Grit and dust fall into the jars which
sometimes have water to hold the dust.
After a one month exposure, the jars are
collected and brought into the laboratory
where their contents are analysed.
Page 9
15-10-2013
10. • In most cases only the total
particulate matter is determined, and
the results are expressed in terms of
tons per square kilometer per
month or g/sq. m / month.
• Monthly isopleth maps can be
constructed showing the variation of
dust fall throughout the area.
Page 10
15-10-2013
14. Filtration
• A fibrous filter which is woven with randomly
oriented fibers acts as a target for the
collection of fine particles. When airborne
particles enter a filter and flow around the
fibers, they are subjected to aerodynamic
forces which result in their collection on the
fibers.
• The principal mechanisms operating are
gravitation, inertia, interception and diffusion.
Page 14
15-10-2013
15. • Many types of filters are available for
removal of particulate matter from gas
streams.
• The chief variations are in the filter media
material and in the shape of the
membrane.
• One common type is the thimble filter
shown diagrammatically.
• The filter paper thimble is filled with wellfluffed cotton which operates at a
sampling rate of 2 cf/min.
Page 15
15-10-2013
16. • By determining the change in
weight of the dried filter after
exposure, dust concentration in the
gas stream is determined.
• The paper thimble cannot be used
with high temperature gases; an
alundum thimble is useful in this
case.
Page 16
15-10-2013
18. Cyclones
• Cyclones are a special type of impactors where
the impaction (on the side walls of the cyclone)
is combined with the gravitational settling of
the large particles.
• The effect is that the large particles will get
trapped before they reach the collecting filter
and thus giving a cut off size dependent of the
size, geometry and air flow velocity through the
cyclone.
• Cyclones (often) have the advantage of being
both small and cheap but still accurate enough
for most modern requirements.
Page 18
15-10-2013
21. Cascade Impactors
• Cascade impactors are consists of a
number of impactor stages connected
in series with smaller and smaller cutoff diameter.
• The cut-off diameter in each stage
depends on the air velocity and
geometry of the stage (i.e. the
distance from the nozzle to the
impaction plate).
Page 21
15-10-2013
22. • Cascade impactors often have up to
some ten stages ranging from a
cut-off diameter on the first stage
of 10 – 30 m to a diameter of 0.1
m or lower on the backup filter in
the end.
• This gives the opportunity to
analyse (e.g. chemical or
gravimetrical) a number of small
size intervals.
Page 22
15-10-2013
23. • Some drawbacks are the risk of bounce off
from one stage to the next (i.e. particles of
wrong size at some of the stages) as well as
the problem of obtaining sharp cut-off
diameters in the last stages (cut-off diameter
less than 0.1 – 0.2 m).
• Coating the impaction plates with oil or some
other sticky substance, which catches the
particles more effectively, can reduce the risk
of bounce of.
• This will then prevent or severely complicate
direct mass concentration calculations of the
different stages.
Page 23
15-10-2013
26. Electrostatic precipitators
• An electrostatic precipitator consists of an
ionizing electrode charged with a high negative
potential and a collector to be maintained at
positive potential produced by a special
transformer and rectifier.
• A known volume of air is allowed to pass
through the precipitator where the incoming
particles become negatively charged by the
electrode and adhere to the positively charged
collecting tube.
Page 26
15-10-2013
27. • The collected particles are weighed and
their number can also be counted
accurately by using a microscope.
• This method of collection of particulate
matter is very efficient as high flow
rates with small pressure drops can be
used.
Page 27
15-10-2013
28. Thermal precipitator
• In thermal precipitators the particles in the
sampled stream move past a very hot wire
and are repulsed to the nearby cold plate
where they are collected.
• However, it can operate only at very low
sampling rates-approximately 50 mililitres
per minute and is useful only for R&D work.
Figure shows a thermal precipitator of the
type supplied by Casella Company Ltd.,
London, England.
Page 28
15-10-2013
32. INTRODUCTION
• High Volume Samplers are the basic
instruments used to monitor Ambient Air
Quality.
• They are in widespread use all over the
world to measure air pollution in industrial
areas, urban areas, on the shop floor,
near monuments and other sensitive
areas.
Page 32
15-10-2013
33. • The High Volume Sampler is a vital tool
for studies relating to impact of
industrialisation to the air analysis, and
for work related diseases of the
respiratory system to air pollution.
• These are very much essential for
various Environmental Impact
Assessment studies
Page 33
15-10-2013
34. Components of HVS
• Heavy Duty Blower,
• Orifice flow meter- measures flow,
• Time Totaliser-records time,
• Programmable Timer- measures time,
• Instrument Cabinet- acts as protection,
• Filter Holder assembly- holds the filter in
position,
• Voltage Stabiliser- guards against
voltage fluctuation,
• Detachable Gable roof- allows passage of
air and protects filter.
Page 34
15-10-2013
35. PRINCIPLE OF OPERATION
• In these samplers, air-borne suspended
particulates (SPM) are measured by passing air
at a high flow-rate of 1.1 to 1.7 cubic meters
per minute through a high efficiency filter
paper which retains the particles.
• The instrument measures the volume of air
sampled, while the amount of particulates
collected is determined by measuring the
change in weight of the filter paper as a
consequence of the sampling.
Page 35
15-10-2013
36. • The passage for air reaching the filter is
designed to prevent heavier settleable dust
particles from reaching the filter (by provision
of cyclone) thus measuring the concentration of
Suspended Particulate Matter (SPM) in
atmospheric air.
Page 36
15-10-2013
37. • In high volume sampler provisions have
been made for simultaneous sampling of
gaseous pollutants.
• Here the air is passed through suitable
reagents that would absorb specific gases
where gaseous pollutants like SO2, NOx,
Cl2, H2S, CS2, NH3, etc. are analysed
subsequently by simple wet chemistry
method to determine the concentration of
specific pollutant.
Page 37
15-10-2013
42. Applications of HVS
• Routine Monitoring by air monitoring
networks
• Open Spaces like forests and national park
air monitoring.
• Monitoring around ecologically sensitive
monuments
•
Page 42
15-10-2013
43. • Data reporting for monthly and
•
•
•
•
yearly averages by local area air
quality networks.
Site Monitoring by industries.
Evaluative Studies
Lab Applications
Research Studies
Page 43
15-10-2013
45. Theory Questions
Q1. State principles used for sampling of
particulate matter. Explain any one in detail.
(Nov 2008, May 2009, 8 marks)
Q2. Explain working of high volume sampler with
sketch. (May 2011, 8 marks).
Q3. Explain various principles used in particulate
matter sampling. (May 2011, 8 marks)
Q4. Explain procedure for determining
concentration of SPM in ambient air.
Page 45
15-10-2013