Types of Pollution, their effects and various control measures

1. Environmental Pollution-
Causes, Effects and Control
Measures
By
Spunky Padrone

2. Definition
“Pollution is the effect of undesirable changes in
our surroundings that have harmful effects on
plants, animals and human beings”.

3. Pollutant
Any thing (solid, liquid or gas) that cause
pollution is called pollutant
Eg. Lead, sulphuric acid, carbon monoxide,

4. Types of Pollution
Degradable Non-degradable
Degradable: Those can be readily broken down by natural
processes
Eg. Discarded vegetables
Non-degradable: Those can not be degraded by natural
processes

5. Types of Pollution
Noise
Air Water Land or Soil
Thermal Nuclear

6. Air Pollution
Air pollution occurs due to the presence of
undesirable solid or gaseous particles in the
air in quantities that are harmful to human
health and environment

7. Types of pollutants
Primary pollutants
Pollutants that are
emitted directly from
identifiable sources –
produced by both
natural events or
human activities
Eg. Dust storms,
emission from
vehicles
Secondary pollutants
When certain chemical
reactions take place
among the primary
pollutants
Eg. Sulphuric acid

8. Primary pollutants
 Carbon oxides (CO2 and CO)
 Nitrogen oxides
 Sulphur oxides
 Volatile organic compounds – hydro
carbons
 Suspended particulate matter

9. TERM MEANING EXAMPLES
Aerosol Particles suspended on air Sprays from
pressurized cans
Mist Aerosol consisting of liquid
droplets
Sulfuric acid mist
Dust Aerosol of solid particles that
are blown into the air
Dust storm
Smoke Aerosol of solid and liquid
particles produced by
chemical reactions such as
fires
Cigarette smoke
Fume Condensation of hot vapors of
metals
Zinc, lead fumes
Plume Smoke coming out of chimney
Fog Aerosol of water droplets
Smog Mixture of smoke and fog

10. Sources of Air Pollution
 Vehicles
 Industries
 Dust and storm
 Air crafts, jet

11. Effects of air pollution
 Prolonged smoking or exposure to air
pollutants can overload or break down the
natural defenses such as hair in our nose,
sticky mucas in the lining of the upper
respiratory tract causing diseases like lung
cancer, asthma, chronic bronchitis etc.,

12.  Cigarette smoking is responsible for the greatest
exposure to carbon monoxide.Exposure to air
containing even 0.001% of carbon monoxide for
several hours can cause collapse, coma and even
death.
 CO is attached to blood hemoglobin for a long
time, it accumulates and reduces the oxygen
carrying capacity of blood. This impairs
perception and thinking, slows reflexes and
causes headaches, drowsiness, dizziness and
nausea and blurred vision.

13. • Nitrogen oxides and suspended particles
both can irritate lungs, aggravate
asthma or chronic bronchitis and
increase respiratory infections.
• Many volatile organic compounds such
as benzene and formaldehyde and toxic
particulates such as lead and cadmium
can cause mutations, reproductive
problems and cancer, breathlessness
and irritation of the eye, nose and throat.

14. • Sulphur dioxide irritates respiratory
tissues, chronic exposure causes a
condition similar to bronchitis.
• It also reacts with water, oxygen and
other materials to form sulphur
containing acids – The acids can
become attached to particles which
when inhaled are very corrosive to the
lung.

15.  Chronic exposure of the leaves to air
pollutants can break down the waxy coating
that helps prevent excessive water loss and
leads to damage from diseases, pests,
drought and frost.
 It also affects photosynthesis, respiration
and other metabolisms.

19. Ozone depletion
 The upper stratosphere consists of
considerable amounts of ozone which
works as an effective screen for UV
light.

22.  The ozone thus formed is constantly broken down
by naturally occurring processes that maintain its
balance in the ozone layer. But the presence of
certain pollutants can accelerate the breakdown of
ozone. (chloroflurocarbons, halons)
 The Chloro-fluro-carbons (CFCs) are extremely
stable, non-flammable, non-toxic and harmless to
handle. It is ideal for air conditioners, refrigerators
and fire extinguishers etc.
 Halons are similar to the CFCs dangerous to ozone
layer.

23.  The CFCs and Halons migrate into the upper
atmosphere after they are released. As they are
heavier than air, they are carried by air currents
and reach upper atmosphere. This is a slow
process and even take few to many years.
 In the stratosphere unfiltered UV radiation severs the
chemical bonds releasing chlorine from CFCs.
 This attacks the ozone molecule resulting in its
splitting into oxygen molecule and an oxygen
atom.
 Thus leading to ozone depletion.

24. Effects of ozone depletion
 On human- sunburn, cataract, skin cancer, weakens the
immune system
 Food production – uv radiation causes reduction in
photosynthesis – reduces nutrient contents and the growth of
plants
 On materials- damages paints and fabrics causing them to
fade faster.
 On climate- global warming – Green house effect- increase
in concentration of certain gases like carbon di
oxide, nitrogen oxides, methane, CFCs trap heat in the
form of infra red radiation near the earth’s surface- Green
house effect

25. Effects of Green house effect
 Polar ice caps will melt causing rise in
ocean levels.
 Fall in agricultural produce.
 Changes in habitats – climatic conditions.

26. 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.

28. Control measures
 Proper fuel and exhaust system in vehicles
 Use of dry and wet collectors, filters,
electrostatic precipitators.
 Providing greater height to the stacks – discharge
pollutants away from the ground.
 Substitution of raw materials that cause more
pollution.

29. Water pollution
 71% of earth’s surface is covered by water-but
only a tiny fraction is available as fresh water.
 97% of total water is found in oceans and 3% is
fresh water.
 Out of this 2.997% is locked in ice caps. The only
0.003% of total volume is available as soil
moisture, ground water, water vapour, water in
lakes, streams, rivers and wetlands.

30. Definition
When the quality or composition of
water changes directly or indirectly
as a result of man’s activities such
that it becomes unfit for any
purpose it is said to be polluted.

31. Types of water
 Surface water- water found in streams,
rivers and lakes etc.
 Ground water- that percolates into ground
 Aquifers- porous water-saturated layers of
sand, gravel or bedrock through which
ground water flows. It is replenished
naturally by rainfall.

32.  Point source – source is known-
eg. Municipal and industrial discharge pipes
 Non-point source- source is unknown-
eg.agricultural runoff, acid rain

33. Sources of Water
Pollution
 Water soluble radioactive isoptopes –
radioactive wastes- ionizing radiation cause
birth defects, cancer and genetic disorders.
 Hot water- thermal plants, nuclear power
stations, power plants release water-
 Oil-leakage

34.  Water soluble inorganic chemicals-acids,
salts and compounds of toxic metals such as
mercury and lead.
 Organic compounds-oil, gaseoline, plastics,
pesticides, cleaning solvents, detergents etc.
 Sediment of suspended water- insoluble
particles of soil and other solids that
become suspended in water

35.  Industrial Effluents:
Water is discharged from industries after having
been used in production processes. This waste water
may contain acids, alkalis, salts, poisons, oils and in
some cases harmful bacteria.
 Mining and Agricultural Wastes:
Mines, especially gold and coal mines, are
responsible for large quantities of acid water.
 Agricultural pesticides, fertilizers and herbicides
may wash into rivers and stagnant water bodies.
 Sewage Disposal and Domestic Wastes:
Sewage as well as domestic and farm wastes were
often allowed to pollute rivers and dams.

39. Causes of water pollution
 Disease causing agents – bacteria, viruses,
protozoa and parasitic worms enter water from
domestic sewage and untreated human and animal
wastes.
 Oxygen depleting wastes- large populations of
bacteria use up the oxygen present in water to
degrade wastes. The amount of oxygen required
to break down a certain amount of organic matter
is called Biological Oxygen Demand(BOD).

40.  If too much organic waste is added, all the
available oxygen is used up and causes
organisms like fish to die.
 Anaerobic bacteria begin to break down the
wastes producing chemicals that have a foul
and unpleasant odour.

41.  Inorganic plant nutrients-water soluble nitrates
and phosphates that cause excessive growth of
algae and other aquatic plants- called
eutrophication.
 Biomagnification- pesticides- reach water-
phytoplanktons-herbivorous fish-carnivorous fish-
water birds-animals-human beings.
 At each stage the chemicals are concentrated
resulting biomagnifiction. Eg.DDT

44. Control measures
 Prevention
 Setting up treatment plants
 Root Zone Process – using reefs

45. .

46. .

47. Soil pollution
 Soil is s thin covering over the land
consisting of a mixture of minerals, organic
materials, living organisms, air and water.
 Under ideal climatic conditions soft parent
material may develop into a centimeter of
soil in 15 years.

48. Soil profile
 The top layer – O horizon- freshly fallen and
decomposed leaves, twigs, animal wastes, fungi
and other organic materials- brown or black in
colour
 Uppermost layer- A horizon-partially decomposed
organic matter and inorganic mineral particles –
darker and looser
 B horizon – subsoil contains less aquatic material
and fewer organisms than A zone.
 C horizon – weathered parent material

50. Causes of soil degradation
 Erosion
 By wind and water accelerated by human
activities such as farming, construction,
overgrazing by livestock, burning of grass
cover, deforestation.

51. Excess use of fertilizers
 Fertilizers, insecticides, herbicides,
pesticides, fungicides, rodenticides
 Soil fertility is lost
 Kill beneficial insects

52. Integrated Treatment
Methods
 Continuous contour trenches or benches
 Live check dams – planting grass, shrubs
and trees etc.
 Bund constructed out of stones.
 Earthen check bund- local soil,across the
stream

53. Integrated Pest Management
 Organic farming
 Use of biofertilzers
 Earthworms- vermicomposting
 Pest control through microbes – Bacillus
thrungiensis, Azadirachta indica- Neem

54. Marine Pollution
The introduction of substances to the
marine environment directly or
indirectly by man resulting in adverse
effects

55. Causes
 Direct discharge of wastes into sea –
sewage
 Washed off materials- fertilizers, pesticides
 Petroleum, oils washed off from roads
 Spill of Toxic substances from ships
 Offshore oil exploration and extraction

56. Effects of marine pollution
 Eutrophication-phytoplankton blooms
 Oil slick – affect plants and fish
 Destroys flora and fauna

57. Control Measures
 Introduction of sewage treatment plants
 Primary treatment-physical process such as
screening and sedimentation to remove
pollutants that will settle, float etc.
 Secondary treatment- to remove BOD

58. Control measures for oil
pollution
 Process of emulsification through chemical
dispersants-sprayed on the oil.
 Biological methods- use of bacteria

59. Noise Pollution
 Noise is unwanted and undesirable sound
 Permitted noise level is 125 decibels

62. dB
n sounds dB
Environmental condition
0 Threshold of hearing
10 Rustle of leaves
20 Broadcasting studio
30 Bedroom at night
40 Library
50 Quiet office
60 Conversational speech
70 Average radio
74 Light traffic noise
90 Subway train
100 Symphony orchestra
110 Rock band
120 Aircraft takeoff
146 Threshold of pain

63. Ambient noise levels dB
Zone Day time Night time
Silent zone 50 40
Residential zone 55 45
Commercial zone 65 55
Industrial zone 70 70

64. B
Duration
(hrs/minutes/seconds)
dB
8 hrs 90
4 93
2 96
1 99
30 minutes 102
15 102
7 108
4 111
2 114
1 117
30 seconds 120
Instantaneous rupture of
membrane
150

65. Effects of noise pollution
 Physical damage to ear- temporary thresh
hold shift-TTS – hearing loss
 Mental fatigue

66. Control techniques
 Reduce noise at source
 Block the path of noise
 Increase the path length and
 protect the recipient

67. Thermal Pollution
 Sources- discharge of warm water into river
 Effects-changes the ecological balance of
river
 Death of fish
 Effect on plants
Control- passing the heated water through a
cooling pond or cooling tower after it leaves
the condenser

68. Nuclear hazards
 Nuclear fission –splitting of the nucleus of
the atom – resulting energy is used for a
variety of purposes
 Hot water
 Uranium waste – ionizing material

69. Effects of nuclear pollution
 Lethal
 Mutation
 Plants and animals
 Marine organisms-fish
 Skin diseases, cancer, eye disorders etc.,

70. Control measures
 Away from the cities
 Proper disposal mechanisms
 Safety measures

71. Role of an individual in
prevention of pollution
 Develop respect to all forms of life
 Try to plant trees where ever you can
 Reduce the use of paper and wood products
where ever possible – use recycled paper
 Do not buy furniture, doors etc., made from
teak – forest based
 Help in restoring a degraded area
 Join in an aforestation program

72.  Advocate organic forming
 Avoid use of pesticides
 Reduce fossil fuel – coal, petrol etc. save petrol
 Shut of the lights and fans when not needed- save
electricity
 Do not use aerosol spray products
 do not pour chemicals, paints pesticides in the
drain

73.  Use rechargeable batteries
 Do not use cans, avoid plastics – plastic
carry bags
 Recycle paper, aluminum, plastics
 Set up compost bin in your garden
 Start community composting
 Keep you and your place clean

74. Environmental protection
begins with
YOU!!!

75. Thank you