Question 1
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 pollutants. Pollutants are the substances which make the water dirty and unfit for human consumption.

(b) Wastewater released by houses is called sewage. It is called liquid waste. It majorly consists of water, which consists of dissolved and suspended impurities called contaminants.

(c) Dried sludge is used as manure. In wastewater treatment plant, the wastewater is passed through screens and then is allowed to settle down in a large tank. Solids like faeces settle at the bottom and are removed with a scraper. This is known as sludge. The water is removed from this and the resultant is known as dried sludge, which is used as manure.

(d) Drains get blocked by cooking oil and fats. Cooking oil and fats can get harden and block the pipes. This results in the overflow of the drainage.

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Wastewater released by houses is called ___

Wastewater released by houses is called sewage.

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