What are the sources and effects of water pollutants?
There are many sources of the water pollution
and have a multiple effects on the body. It has main adverse effects in the
villages. Nearly, half of our population suffers from the water pollution along
with its consequences and is responsible for the death of one third of our
population. The water pollution causes the de oxygenation of water, addition of
poisonous and suspended particles; non toxic salts are also added. Heating is
also a vital factor responsible for it. The domestic wastes and sewages are the
main source of water pollution. It occurs from the boats, ships and
municipalities. The canning industries and slaughter house also add the organic
waste into the water. The people in their villages wash their utensils, animals
and hands in the same pond. They also use this water for bathing and drinking.
This water is an agent of cholera, typhoid and jaundice. It also causes the skin disease in few cases. There are many industrial
wastes and effluents present in the municipal sewers. They cause the degradation
of sewage with the help of micro organisms. They eat up all the oxygen present
in the water. There are pathogens present in the raw sewage. The intestinal
bacteria are good indicators of the pollution in the raw sewage. The more is
the number of intestinal bacteria more is the pollution in the sewage. The
river Yamuna has more number of coliforms which are followed by the
enterococci. The sewage also increases the activity of decomposers which are
referred as a sewage fungus. The bacteria, algae along with the blue green
algae constitute the sewage fungus. The oxygen to the sewage flora and fauna is
given by the algae. There are other plants present in the sewage which provides
the oxygen. There are many protozoa’s in the sewage which eat the bacteria. The
algal component also supports the fungal and bacterial count. If there is
decrease in the algal component the fungal and bacterial count also reduces. It
affects the overall population except the blood and sludge worms. There is a
foul odor from the sewage. It makes the sewage to look oily and water brown. A
scum and sludge is formed from the organic waste and makes the water unfit for
recreational and industrial purposes. The blooms are formed by the algae which
decreases the level of oxygen. It adds more organic
matter and cause the fouling of water. There are new detergents
used these days which provide white and bright color to the clothes. These
degrade slowly and aggregate making the water unfit for human consumption.
There are phosphates present in them which allow the algae to grow and increase
the overall organic content. There are many secondary pollutants which are
formed by the process of anaerobiosis. It includes the hydrogen disulphide,
ammonia and methane. The hydrogen disulphide has the ability to combine with
the other elements and form a black color sulphide that can float.
There are certain pollutants which are present on
the surface of land and they are passed into the water reservoirs during rains. The fertilizers are
added to it to increase the yield of crop which is also passed to the water
reservoirs. This fertilizer rich water goes into the streams and lakes leading
to the eutrophication. It leads to the increase growth of blooms and aquatic plants. The plants which
give rise to the bloom occur on the surface. The submerged plants do not
produce the oxygen and cut of the light. The oxygen produced by the bloom goes
into the atmosphere. The respiration of plants and animals during the night
further decreases the level of oxygen. When the plant dies it increases the
organic matter and it further decreases the level of oxygen. It causes the
death of aquatic animals. It leads to the formation of unfit water for
recreational and industrial processes.
So, the excess of fertilizers must not be used. However, the small doses of
fertilizers and manure must be used. They are helpful in the minimizing of
surface run off. The ammonium sulphate
and urea are considered the best fertilizers for the paddy. Some research
institutes have recommended the use of urea along with the mud to form mud
balls. They are situated below the soil surface. The ammonium sulphate also
replaces the nitrates in tea plantations.
The unethical agriculture and forest practices lead
to the soil erosion. It may also occur due to rain. It helps to make water
muddy. It does not support the growth of plant as it cuts off the light. So,
the animal population also gets affected. They also decrease the water ways as
the mud and silt are deposited. The industrial wastes are moved into the water.
They contain the mercury, lead, cadmium and other metals. The mercury is
liberated as the result of combustion of coal. It is also produced by the
smelting of ores and in the paper and paint industries. It is persistent and in
the water it changes into the water soluble form which is known as the
dimethyl. It has the ability to enter the
food chain. It also causes the biological and ecological
amplification. It kills the fishes and contaminates the rest of fauna. If the
human beings feed on these fauna it leads to the condition known as a minamata
disease which shows a crippling deformity which is accompanied by the numbness
of lips along with the limbs, it affects the vision, hearing, taste, speech and
ultimately leads to the death of an individual. The genetic changes are brought
by the mercury also. It was supported by the Ramel in 1974. The lead occurs
from the smelters, battery, industry, paint and the automobile exhausts. It
causes mutations and may lead to the anemia, headache, discoloration in the
gums, loss of muscle power, and irritation. The cadmium occurs from the
industries, electroplating, phosphates and the pesticide industry. It also
causes the biological amplification. It has the ability to accumulate inside
the kidneys, liver and pancreas. It may cause the renal damage, hypertension,
anemia, necrosis of the testes and an injury to the placenta. It can enter
through the food chain and is entered via wheat and rice. It was supported by
the Nath in 1986. The other metals involved are copper, zinc, nickel and
titanium. They alter the function of enzymes. The liquid effluents are moved
into the water which consists of the acids, bases and toxic substances. They
kill the fish and other aquatic animals. They also cause an adverse effect on
the human beings. They also involve many rivers like Gomati, Yamuna, Gang and
Hooghly. They are present in the different parts of India. The continental
shelf is a good source of oil. It is transported from one part of the country
to other by the use of sea. The tankers which carry the fuel are washed after
unloading in the sea. They are filled with the water. So, oil spills are very
common in the sea. They occur near the ports and shore lines. During
transportation accidents may happen which can spread the oil over few hundred
kilometers. Nearly, 10 million tons of oil is spilled into the ocean per year.
The other source of spillage of oil in the river is the refineries. They
discharge in the form of effluents. There was a Barauni refinery which has an adverse
effect on the flora and fauna of the river Ganges in the late 20th century. It
leads to the spreading of oil
on the surface of water which leads to the prevention of oxygenation. It also
depletes the oxygen present in the water and leads to the degradation. It does
not allow the growth of plankton and inhibits the photosynthetic activity of
the other organisms in water. The decreased availability
of food, oxygen leads to the destruction of animal life. The oil present on the
surface of water may catch fire and can kill the organic matter present in
water. The sea birds which are
smeared with the oil get sick and die. The detergents which are used to clean
the spill oil are also harmful and it was established in the Torrey Canyon
accident along the British coast. There are hot bodies and effluents which may
lead to the thermal pollution. The water which is warm contains less amount of
oxygen as compared to the cold water. As the water is warmer the rate of
decomposition is less. There are many animals which fail to divide and the
green alga is replaced by the blue green algae. The trot fails to hatch the
eggs at higher temperature and the salmon does not spawn. There are industries
which are present in the coastal area which dump their wastes directly into the
oceans and rivers. There are certain inland waters in some areas which are rich
in the insecticides and pesticides. The sewage in the coastal cities does reach
the sea directly. The products from the ship like garbage, sewage, detergents
also pollute the water. Around one fourth of the people living in south Asia
survive on this contaminated water and their products. There are people in the
south pacific region which survive on sea food. They suffer from cholera and
hepatitis frequently. There are certain segments of the people in Nigeria which
use beaches as the place of toilet. The population becomes prone to water borne
diseases along with the viruses and parasites. In the coastal waters the oxygen
level becomes so dim that it is difficult for the flora and fauna to survive.
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