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प्रश्न
Differentiate between chemical pollution and thermal pollution.
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उत्तर
(a)
Chemical pollution:
A large number of industrial chemicals which include chemicals from paint, textile & dyestuff industry & various acids & salt solutions enter into the water when discharged as industrial wastes.
Chemical pollutants include — Metallic salt solutions of mercury & lead which cause heavy devastation of marine & plant life.
Agricultural wastes include — Poisonous pesticides namely fungicides & insecticides which may also enter underground water through the soil.
(b)
Thermal pollution:
Certain industries such as the iron & steel industry & numerous chemical plants use large amounts of water for varied functions.
The discharged wastewater after going through technical processes is rendered hot & on entering streams of natural water enhances the growth of harmful biological organisms.
संबंधित प्रश्न
_________ is used for desalination of brackish water.
Explain phenomenon of acid rain.
List the cause of water pollution.
Fill in the Blanks:
Sewage is the source of ______ pollution
Name two heavy metals from industries that pollute water.
Water pollution can spread ________ diseases in man.
Excessive use of chemical fertilizers depletes the soil and causes water pollution.
Classify the most significant sources of water pollutants.
A pond contains clean water. Which of the following activities will produce least pollution of water?
BOD is measure of ______.
