Science, asked by virdisuman488, 6 months ago

5. What is sludge? Explain how it is treated.
6. Untreated human excreta is a health hazard. Explain.​

Answers

Answered by Ridhafathma
0

Answer:

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.

Untreated human excreta is a health hazard because it consists of various disease-causing microorganisms that will contaminate the soil and water resource from where people draw water for drinking and domestic purposes.

Answered by Anonymous
1

Answer:

  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.

2. Untreated human excretions are a health hazard. It causes pollution of soil and water including the underground water. Thus, it contaminates the sources of water from which people collect water for drinking and household purposes. When this contaminated water is used for drinking, it can cause diseases such as cholera, typhoid, hepatitis, dysentery, etc., which may even lead to death.

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