Question

V.
Very short answer type questions :
18.
Name the three infectious diseases caused by stagnant sewage.
Ans.
19.
Name any two organic impurities present in sewage.
Ans.
20.
Name the various wastes which should not be thrown down the drain.
cambodia
own to
meracom
Ans.
21.
Name the three stages of
sewage treatment. mars kid
Ans.
Multiple choice​

Answer 1

Answer:

18) Trachoma , melioidosis and salmonellosis

19) The two organic impurities present in sewage water are human faeces and animal wastes like animal dung.

20) Cooking oil and fats should not be thrown down the drain. They can harden and block the pipes. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water.

21) Screening and pumping

Grit removal

Filtration

THERE YOU GO

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Answer 2

Answer

#18 = leptospirosis

 =giardiasis

 =encephalitis

 #19 =nitrates

         =phosphates

#20 =animal dung

# 21 = solid removal

         bacterial decomposition

          extra  filtration

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Explanation: