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Secondary Treatment

Fill in the b...

Question

Fill in the blanks:
(a) Cleaning of water is a process of removing ________.

(b) Wastewater released by houses is called _.

(c) Dried __ is used as manure.

(d) Drains get blocked by _ and _____.

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Solution

(a) Cleaning of water is a process of removing contaminants.

This process of wastewater treatment is commonly known as sewage treatment.

(b)

Wastewater released by houses is called sewage.
It also includes the wastewater from industries, hospitals, offices and other users. It also includes rainwater that has run down the street

(c)

Dried sludge is used as manure.
The sludge produced during the wastewater treatment can be dried and used as manure.

(d) Drains get blocked by cooking oil and fats.

They can harden and block the pipes. In an open drain the fats clog the soil pores reducing its effectiveness in filtering water.

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Secondary Treatment

Standard VII Chemistry

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