What are the degrees of water
impurity?
There are different degrees of the water impurity. It can be
due to the different organisms which differ in the tolerance level of
temperature, ph, oxygen, calcium and phosphorous content. It also involves the organic
matter, poisons and some pollutants. There are certain fishes known as daphnia
which are sensitive to poison and metals. The study of aquatic life gives
information regarding the water pollution. The bio chemical oxygen demand also
helps in the measurement of organic wastes in the polluted water. It is denoted
by BOD. It is defined as the requirement of oxygen by small organisms so that
the organic matter which is easy to be decomposed can be stabilized under the
oxygen rich environment. The oxygen is measured in the milligrams for few days.
It is measured in I liter of water at a temperature around twenty degree
Celsius. More is the organic waste more is the BOD value. The water which is
not rich in the organic matter has a value of BOD equal to 1500 milligram per
liter. The water which is rich in the organic matter has a value of BOD more
than 1500 milligram per liter. It relies only on the organic matter
measurements and other factors are not taken into account. So, it is not a
reliable method for the water pollution. Another method is there which can
substitute this method and is known as the COD which refers to chemical oxygen
demand. It takes into account all the oxygen consuming pollutants which are
present in the water.
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