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What is Sludge? Explain How It is Treated. - CBSE Class 7 - Science

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Question

What is sludge? Explain how it is treated.

Solution 1

Semi-solids such as faeces that settle down during wastewater treatment are called sludge. This sludge is removed using a scraper and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas. This biogas is used as a low-cost fuel for heating, cooking, etc. It is also used to produce electricity.

Solution 2

Sludge is the collected solid waste from the wastewater during the treatment in water treatment plant. Sludge is decomposed in a separate tank by the anaerobic bacteria. Activated sludge is used as manure.

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APPEARS IN

 NCERT Solution for Science Textbook for Class 7 (2018 to Current)
Chapter 18: Wastewater Story
Q: 5 | Page no. 228
Solution What is Sludge? Explain How It is Treated. Concept: Wastewater Treatment Plant ((WWTP)).
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