The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?

3

(a)

Describe onsite disposal systems.

3

(a)

Can we contribute in sanitation at public places? Explain.

3

(a)

Three statements are provided here which define the terms, i.e. sludge, sewage and wastewater.
Pick out the correct definition for each of these terms.
(a) The settled solids that are removed in wastewater treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals and other public buildings.

3

(a)

With reference to the treatment of polluted water at home by aeration, filtration, chlorination processes answer the following questions.
Do chlorine have an odour?

3

(a)

Observe the given figure and answer the following: What does this figure show?

3

(a)

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

3

(a)

How can we control water pollution?

3

(a)

What do you mean by water cleaning?

3

(a)

What is potable water? Write its characteristics

3

(a)

List the various sources of water pollutions.

3

(a)

How a vermi-composting toilet works?

3

(a)

What are the various alternative arrangements for sewage disposal other than WWTP?

3

(a)

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities  (a) nutrients. (b) disease causing bacteria and other microbes. Give names for (x), (a) and (b) ?

3

(a)

What are the different types of inorganic and organic impurities generally present in sewage?

3

(a)