Question

5. What is sludge? Explain how it
6. Untreated human excreta is a health hazard. Explain
7. Name two chemicals used to disinfect water
8. Explain the function of bar screens in a wastewater treatment
9. Explain the relationship between sanitation and disease
10. Outline your role as an active citizen in relation to sanitation​

Answer 1

Answer:

5.What is sludge? Explain

how it

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.

6.Untreated human excreta

is a health hazard. Explain

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

7.Name two chemicals used to disinfect water

Answer-The three chemicals most commonly used as primary disinfectants are chlorine, chlorine dioxide and ozone.

8.Explain the function of bar screens in a wastewater treatment

Answer-A bar screen is a mechanical filter used to remove large objects, such

as rags and plastics, from wastewater. It is part of the primary filtration flow and typically is the first, or preliminary, level of filtration, being installed at the influent to a wastewater treatment plant.

9.Explain the relationship between sanitation and disease

Answer-Sanitation and disease are related to each other as lack of sanitation can cause diseases. 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.

10.Outline your role as an active citizen in relation to sanitation

Answer-A citizen has many responsibilities regarding sanitation. Among other things, an active citizen should do the following with regard to maintaining proper sanitation: 1) Ensure that his surroundings (both inside

and outside home) are clean. 2) Ensure that the sewerage system in his house is properly managed.