enviornment assignment
TRANSCRIPT
8/3/2019 Enviornment Assignment
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TEXTILE INSTITUTE OF
PAKISTAN
ENVIORNMENTAL MANAGEMENT
AIR POLLUTION
MADE BY: HASAN SHAHAB KHAN
MUHAMMAD ALI
TS4
SUBMITTED TO: DR. SEEMA JILANI
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INTRODUCTION:
Air pollution is the mixture of chemicals, particulate matter, or biological materials that can
harm or discomfort to humans or other living organisms, or cause damage to the natural
environment or built environment, into the atmosphere.
Air pollution occurs when the air contains gases, dust, fumes or odor in harmful amounts.
That is, amounts which could be harmful to the health or comfort of humans and animals or
which could cause damage to plants and materials.
The substances that cause air pollution are called pollutants. Pollutants that are pumped into
our atmosphere and directly pollute the air are called primary pollutants. Primary pollutant
examples include carbon monoxide from car exhausts and sulfur dioxide from the
combustion of coal.
If these primary pollutants combine together they form compounds which are called
secondary pollutants which can further arise the pollution. Photochemical smog is an
example.
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INDOOR POLLUTION:
We spend our maximum time and do our activities in a close environment. For this reason;
some experts feel that more people suffer from the effects of indoor air pollution than outdoor
pollution.
Tobacco smoke, cooking and heating appliances, and vapors from building materials, paints,
furniture, etc. Are the main sources of indoor air pollution. Pollution exposure at home and
work is often greater than outdoors. The California Air Resources Board estimates that indoor
air pollutant levels are 25-62% greater than outside levels and can pose serious health
problems.
OUTDOOR POLLUTION:
Smog is a type of large-scale outdoor pollution. It is caused by chemical reactions between
pollutants derived from different sources, primarily automobile exhaust and industrial
emissions. Cities are often centers of these types of activities, and many suffer from the
effects of smog, especially during the warm months of the year.
Geographical location, wind, temperature and other factors affect the dispersion of pollutant
differently. However, sometimes this does not happen and the pollution can build up to
dangerous levels. A temperature inversion occurs when air close to the earth is cooler than
the air above it. Under these conditions the pollution cannot rise and be dispersed. Cities
surrounded by mountains also experience trapping of pollution. Inversion can happen in anyseason. Winter inversions are likely to cause particulate and carbon monoxide pollution.
Summer inversions are more likely to create smog.
Acid rain is another cause of outdoor pollution. When a pollutant, such as sulfuric acid
combines with droplets of water in the air, the water (or snow) can become acidified. The
effects of acid rain on the environment can be very serious. It damages plants by destroying
their leaves, it poisons the soil, and it changes the chemistry of lakes and streams. Damage
due to acid rain kills trees and harms animals, fish, and other wildlife.
The Greenhouse Effect, another cause of outdoor pollution also
referred to as global warming, is generally believed to come from the
buildup of carbon dioxide gas in the atmosphere. Carbon dioxide is
produced when fuels are burned. Plants convert carbon dioxide back to
oxygen, but the release of carbon dioxide from human activities is
higher than the world's plants can process. The situation is made worse
since many of the earth's forests are being removed, and plant life is being damaged by acid
rain. Thus, the amount of carbon dioxide in the air is continuing to increase. This buildup acts
like a blanket and traps heat close to the surface of our earth. Changes of even a few degrees
will affect us all through changes in the climate and even the possibility that the polar ice
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caps may melt. (One of the consequences of polar ice cap melting would be a rise in global
sea level, resulting in widespread coastal flooding
Ozone depletion is another result of outdoor pollution. Chemicals released by our activities
affect the stratosphere , one of the atmospheric layers surrounding earth. The ozone layer in
the stratosphere protects the earth from harmful ultraviolet radiation from the sun. Release of
chlorofluorocarbons (CFC's) from aerosol cans, cooling systems and refrigerator equipment
removes some of the ozone, causing "holes"; to open up in this layer and allowing the
radiation to reach the earth. Ultraviolet radiation is known to cause skin cancer and has
damaging effects on plants and wildlife.
SOURCES:CARBON DIOXIDE:
Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Carbon
dioxide is widely considered to be a pollutant when associated with cars, planes, power
plants, and other human activities that involve the burning of fossil fuels such as gasoline and
natural gas and deforestation. These increase a huge amount of carbon dioxide in the
atmosphere from the last 150 years.
CO2 is a good transmitter of sunlight, but partially restricts infrared radiation going back from
the earth into space. This produces the so-called greenhouse effect that prevents a drastic
cooling of the Earth during the night. Increasing the amount of CO2 in the atmosphere
reinforces this effect and is expected to result in a warming of the Earth's surface. Currently
carbon dioxide is responsible for 57% of the global warming trend.
GREENHOUSE EFFECT:
Other greenhouse gases include methane — which comes from such sources as swamps and
gas emitted by livestock and chlorofluorocarbons (CFCs), which were used in refrigerants
and aerosol propellants until they were banned because of their deteriorating effect on Earth's
ozone layer.
SULPHUR DIOXIDE:
Sulphur Dioxide is an another cause of outdoor pollution. Sulfur dioxide and closely related
chemicals are known primarily as a cause of acid rain. But they also reflect light when
released in the atmosphere, which keeps sunlight out and causes Earth to cool.
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Sulfur dioxide from volcanoes can cool the planet by blocking sunlight, cutting the amount of
the compound in the atmosphere lets more sunlight through, warming the Earth. This effect is
exaggerated when elevated levels of other greenhouse gases in the atmosphere trap the
additional heat.
Sulfur dioxide is produced by combustion of sulfur-containing fuels, such as coal and fuel
oils. Also, in the process of producing sulfuric acid and in metallurgical process involving
ores that contain sulfur. Sulfur oxides can injure man, plants and materials. At sufficiently
high concentrations, sulfur dioxide irritates the upper respiratory tract of human beings
because potential effect of sulfur dioxide is to make breathing more difficult by causing the
finer air tubes of the lung to constrict.
HOW TO PREVENT IT?
To make an agreement between countries to reduce the emission of the carbondioxide.
Put taxes on carbon emissions or higher taxes on gasoline.
N0X - nitric oxide (N0) and nitrogen dioxide (N02)
Natural component of the Earth's atmosphere.
Important in the formation of both acid precipitation and photochemical smog
(ozone), and causes nitrogen loading.
Comes from the burning of biomass and fossil fuels.
Average residence time in the atmosphere is days.
Has a role in reducing stratospheric ozone.
N20 - nitrous oxide
Natural component of the Earth's atmosphere.
Important in the greenhouse effect and causes nitrogen loading.
MOTORVEHICLES:
The two main sources of air pollution are motor vehicles & industries. When they burn
petrol, cars and trucks release significant quantities of sulphur dioxide, oxides of nitrogen,
carbon monoxide, lead, and suspended particulate matter.
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INDUSTRY:
Electrical power plants and industries emit particulate matter, sulphur oxides, nitrogen
oxides, hydrocarbons and carbon dioxides.
The top three industrial sources of toxic air pollutants are the chemical, metal, and paper
industries.
MUNICIPALSOLIDWASTE:
When solid waste is burnt, heavy metals like lead, gases and soot is spread over residential
areas. Rubbish, dust and gases found during the decomposition of waste, all contribute to air
pollution.
MEDICALWASTE:
Burning medical waste is a serious source of air pollution, particularly in cities. Most
incinerators are rudimentary by today's standards. They burn waste incompletely, releasing
acidic gases, heavy metals, and dioxins into the air.
DEVELOPING COUNTRIES:
As developing countries become more industrialized, they also produce more air pollution.
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The leaders of most developing countries believe they must become industrialized rapidly in
order to be economically competitive.
MAJOR AIR POLLUTANTS AND THEIR
IMPACTS:
Air pollution consists of substances present in the atmosphere in high enough levels to harm
humans, other animals, plants, or materials. Air pollution can result from human activities
such as driving cars. It can also come from natural sources, such as smoke from forest fires
caused by lightning or from volcano eruptions.
Urbanization causes the pollution to increase rapidly and disturb the balance of the nature of
the earth. With the combination of growing industries the air pollution get increases.
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•SuspendedParticulateMatter
This is a mixture of solid and liquid particles suspended in the air. Suspended particulates are
seen as dust, smoke, and haze which can make breathing difficult, especially for people with
chronic respiratory problems.
•VolatileOrganicCompounds(VOCs)
VOCs include gasoline, paint solvents, and organic cleaning solutions. They evaporate and
enter the air as vapor, and as molecules resulting from the incomplete burning of fuels and
wastes.
•CarbonMonoxide(CO)
One source of carbon monoxide is vehicle emissions. This is an invisible, odorless gas that is
highly toxic to air-breathing animals because it interferes with the blood's ability to transport
oxygen. Even low levels can start or increase damage to the heart in individuals with artery or
heart problems. At medium concentrations, carbon monoxide causes headaches and fatigue.
As the concentration increases, reflexes slow down and drowsiness occurs. At high levels
carbon monoxide causes death. People at greatest risk from carbon monoxide include
pregnant women, infants, and those with heart or respiratory diseases.
•NitrogenOxides(NOX)
Nitrogen Oxides are lung irritants that can lead to acute respiratory diseases in children. They
may also cause over-sensitivity to pollen and dust in people suffering from asthma.
•SulphurOxides(SOX)
Sulphur Dioxide is converted to sulphuric acid in the atmosphere. It can be poisonous to both
plants and animals. Like particulates, sulphur dioxide irritates the respiratory tract, causing
airways to close, and interfering with the lungs. Children and the elderly are especially
sensitive to sulphur dioxide, as are people suffering from asthma and emphysema.
Some research indicates that the sulphur dioxide is reducing crop yields. The potential for
crop losses in Asia has been indicated by a study in Pakistan where a 40 per cent reduction in
rice yields was linked to the presence of pollutants in the air.
•Lead&otherheavymetals
Lead is dangerous, even at low concentrations and can lead to reduced intelligence in
children, brain damage and death. It accumulates in the body and damages body tissue.
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•GroundLevelOzone
Ozone in the upper atmosphere shields us from ultraviolet radiation. However on ground
level, it is highly toxic to both plants and animals as it can damage lungs. It can bring on
coughing; asthma attacks and lowers the immune system.
•Fuelwood
Indoor air pollution is caused by the burning of fuel-wood and dung for cooking, and can
cause suffocation.
CAUSES:
Air pollution is caused by a wide variety of things. The earth is great at cleaning the air on its
own. However, air pollution has grown so much; the earth can no longer clean all of it. This
is starting to have adverse effects on the environment such as causing acid rain, smog and a
wide variety of health problems.
COMBUSTION ENGINE EXHAUST:
Cars, trucks, jet airplanes and other combustion engine vehicles cause air pollution. The
exhaust from these contains carbon monoxide, nitrous oxide and gaseous oxide. This type of air pollution creates smog (as seen in Los Angeles) which causes respiratory health problems
and holes in the ozone layer, which increases the exposure to the sun's harmful rays.
FACTORIES:
Factories, office buildings, homes and power-generating stations burn fossil fuels, which
cause air pollution. The burning of oil and coal (fossil fuels) also contributes to smog. This
air pollution destroys plants, damages buildings and creates oxidation on iron.
PETROLEUM:
Petroleum refineries release hydrocarbons and various particulates that pollute the air.
POWER LINES:
Some power lines are not insulated and are high voltage. This creates air pollution.
PESTICIDES:
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Pesticides used to kill indoor and outdoor pests, insecticides used to kill insects and
herbicides use to kill weeds all cause air pollution.
RADIOACTIVE FALL OUT:
Radioactive fallout causes air pollution from the nuclear energy dispersed, which is a dust.
FERTILIZER DUST:
Dust from fertilizers used to help plants grow causes air pollution.
MINING OPERATIONS
Mining causes air pollution by releasing a variety of particles.
MILLS AND PLANTS:
Mills and plants, include paper mills, chemical plants, iron mills, steel mills, cement plants
and asphalt plants, release emissions into the air causing air pollution.
TEXTILE INDUSTRY CONTRIBUTING
IN AIR POLLUTION:
Air pollution is the introduction of chemicals, particulate, or biological material that cause
harm or discomfort to humans or other living organisms, or damages the natural environment
into the atmosphere.
Emissions fromTextile Processing
Oil mist and organic emissions produced when textile materials containing lubricating oils,
plasticizers, and other materials that can volatilize or be thermically degraded into volatile
substances, are subjected to heat.
Processes that can be sources of oil mist include tentering, calendaring, heat setting, drying,
and curing.
Acid mist produced during the carbonization of wool and during some types of spray dyeing.
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Solvent vapors released during and after solvent processing operations such as dry cleaning
and volatile organic compounds from mineral spirit solvents in print pastes or inks.
Exhaust gases emanating from polycondensation of melt spinning fiber lines
Dust and lint produced by the processing of natural fibres and synthetic staple prior to and
during spinning, as well as by napping and carpet shearing.
Emission in processes
Easy care finishing
Formaldehyde – carcinogenic agent
Flame retardant finish
Hydrogen cyanide, halogen compounds or oxides of nitrogen,
highly conc. Carbon monoxide
Drying, curing
HCl and cyanide produced when drying of incompletely removed excess antistatic,flame retardant or softening compounds occurs
GENERATION OF WASTE DURING PROCESSES
Process Source Pollutants
Energy
Production
Emissions from boiler Particulates, nitrous oxides
(Nox) sulphur dioxide (SO2)
Coating, drying
and curing
Emission from high temperature ovens Volatile organic components
(VOCs)Cotton handling
activities
Emissions from preparation, carding,
combing, and fabrics manufacturing
Particulates
Sizing Emission from using sizing compound
(gums, PVA)
Nitrogen oxides, sulphur oxide,
carbon monoxide.
Bleaching Emission from using chlorine compound Chlorine, chlorine dioxide
Dyeing Disperse dyeing using carriers Sulphur
dyeing
Aniline dyeing
Carriers
H2S
Aniline vapors
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Printing Emission Hydrocarbons, ammonia
Finishing Resin finishing Heat setting of synthetic
fabrics
Formaldehyde
Carriers - low molecular weight
Polymers - lubricating oils
Chemical storage Emissions from storage tanks for
commodity and chemicals
Volatile organic components
(VOCs)
Waste water
treatment
Emissions from treatment tanks and
vessels
Volatile organic components,
toxic emissions
Effect of Dust - Health Hazards
Cotton dust – biossinosis (lung disease)
Asbestos dust – lung cancer Wool dust – allergic, sneezing attacks, asthma and related diseases
Pollutants Effects On Human Being Sources
Sulpher di oxide Irritates respiratory system
and causes bronchitis
Boiler flue gas, rayon plant
etc.
aldehydes Irritates all parts of
respiratory system
Polyester plant
chlorine Causes lung irritation and
also irritation in eyes
Processing house
Carbon di oxide Deprives body cells of
oxygen and cause
unconsciousness by CO
combining with hemoglobin
Boiler house
PREVENTION:How you can we help to prevent Air Pollution:
Encourage people to leave their car at home and walk or ride a bicycle to travel short
distances.
Develop efficient public transport systems to help reduce dependence on private cars.
Save energy - Try to use minimum amounts of natural gas and even electricity.
Provide Government subsidies to encourage the introduction of petrol with low
sulphur and no lead.
Always buy recycled products.
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Reuse things such as paper and plastic bags, paper etc. This will contribute a lot
towards reducing the effects of air pollution and global warming.
Avoid the use of firecrackers. You don't really need it to express your feeling of
happiness.
Promote energy efficiency and conservation. Energy efficiency means usingtechnology to accomplish tasks with less energy.
Modify furnaces and engines to provide more complete combustion. This helps
control the production of both carbon monoxide and hydrocarbons.
Replace incandescent light bulbs with compact fluorescent bulbs
TEXTILE PREVENTION:Pollution Control
spinning mill
maintaining m/c parts
Maintaining hardness of rubber cots
Maintaining RH%
Using overhead pneumatic cleaners
Cyclone filters, Cloth filter
Wet processing unit
Electrostatic precipitator
scrubber oxidizer
GENERAL CONTROL MEASURES:
HEIGHT OF CHIMNEYS:
Chimneys height should not be less than 30 meters and release the pollutants not in the
vicinity of living organism
GRAVITATIONAL AND INERTIAL SEPERATOR:
These are working on gravitational and inertial concepts of collecting, filtering etc of the
particulate matter. Eg. Settling chambers, dynamic separator and wet cyclones & multiple
cyclones.
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FILTERS:
Woven or sintered metal beds of fibres, metal turning, fibrous mats & aggregate bed filter,
paper filters and fabric filters are used for the filtration of particulate matter like dust, lint and
fumes.
CONCLUSION:
From all the above and the research we get to know that air pollution is badly effecting the
environment. The amount of air pollution is increase very rapidly that its now become
difficult to control it. Government is making policies to control it but the result was not
according to the need. Urbanization, industrialization, burning of fossil fuels and other
process make the air pollution possible in the environment.
The best way to control the air pollution by making those products which contain less
pollutant, or prevent it at the early stage, or at the source.
Textile contribution in air pollution is increasing day by day. Especially in Pakistan where the
economy is running by the textile sector. Land contamination, fumes generating by the
dyeing process, chemical inhaling and dispersing of the fumes make environment hazardous
and unhealthy. That’s the reason why the labor of textile sector is mostly effected by the
disease of asthma, cancer, respiratory illness and etc.