Q4) Fill in the blanks:-
a. The impurities present in wastewater are called.b. The World Water Day is celebrated every year on .c. The activated sludge is about % water.d. Water is disinfected by using chemicals like and .e. and are water borne diseases.f. Dried sludge is used as ___.

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Solution

Fill in the blanks:-
Answers :

a. The impurities present in wastewater are called contaminants .
b. The World Water Day is celebrated every year on 22 march.
c. The activated sludge is about 97 % water.
d. Water is disinfected by using chemicals like ozone and chlorine
e. Anaemia and Typhoid are water borne diseases.
f. Dried sludge is used as manure

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