Exercises
1. Fill in the blanks:
(a) Cleaning of water is a process of removing
(b) Wastewater released by houses is called
(c) Dried Sludol is used as manure.
(d) Drains get blocked by Dil a nd 1
2. What is sewage? Explain why it is harmful to
sewage into rivers or seas.
3. Why should oils and fats be not released in the dr
4. Describe the steps involved in getting clarified wa
5. What is sludge? Explain how it is treated.
6. Untreated human excreta is a health hazard. Ex
7. Name two chemicals used to disinfect water.
8. Explain the function of bar screens in a wastewa
9. Explain the relationship between sanitation and
10. Outline your role as an active citizen in relation
11. Here is a crossword puzzle: Good luck!
RIP
Answers
1) a.contaminants
b.sewage
c.manure
d.plastic & sludge
2)Wastewater released by houses is called sewage. Untreated sewage should not be discharged untreated into the sea because sewage consists of pollutants and harmful microorganisms which will contaminate water causing disease in people using contaminated water.
3)Oils and fats should not be released in the drain because drains get blocked by cooking oil and fats.
4)Use an aerator from an aquarium to bubble air through the sample in the glass jar. Allow several hours for aeration; leave the aerator attached overnight. If you do not have an aerator, use a mechanical stirrer or a mixer. This reduces the foul smell of wastewater.
Use an aerator from an aquarium to bubble air through the sample in the glass jar. Allow several hours for aeration; leave the aerator attached overnight. If you do not have an aerator, use a mechanical stirrer or a mixer. This reduces the foul smell of wastewater.Then, the water is filtered through the layers of sand, fine gravel, and medium gravel. Filtration makes the wastewater clean from various types of pollutants. The water is filtered continuously until it becomes clear.
Use an aerator from an aquarium to bubble air through the sample in the glass jar. Allow several hours for aeration; leave the aerator attached overnight. If you do not have an aerator, use a mechanical stirrer or a mixer. This reduces the foul smell of wastewater.Then, the water is filtered through the layers of sand, fine gravel, and medium gravel. Filtration makes the wastewater clean from various types of pollutants. The water is filtered continuously until it becomes clear.Water is disinfected by using a chlorine tablet.
5)
Solids like faeces settle at the bottom while treating sewage, and this material is called as sludge. Sludge can be treated as follows
Solids like faeces settle at the bottom while treating sewage, and this material is called as sludge. Sludge can be treated as followsSludge is removed using a skimmer and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
6)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. When people use water contaminated with human excreta, they get diseases like Cholera, Typhoid, Dysentry and Hepatitis.
7)Chlorine and Ozone are used to disinfect water.
8)Bar screen removes large objects like rags, sticks, cans, plastic packets and napkins.
9)Sanitisation and disease are interrelated as lack of sanitisation lead to illness and good sanitisation practices prevent the diseases.
10)Every citizen has a role to play in maintaining proper sanitisation. Following are the things we should follow to play an active role.
Ensure that our surroundings are kept clean.
The sewage system in the house should be properly managed
Report to the concerned authoritive immediately in case of leakages in sewage pipes.
11)Across
Across3. Sewage
Across3. Sewage4. Sludge
Across3. Sewage4. Sludge6. Sanitation
Across3. Sewage4. Sludge6. Sanitation8. Excreta
Across3. Sewage4. Sludge6. Sanitation8. ExcretaDown
Across3. Sewage4. Sludge6. Sanitation8. ExcretaDown1. Wastewater
Across3. Sewage4. Sludge6. Sanitation8. ExcretaDown1. Wastewater2. Sewer
Across3. Sewage4. Sludge6. Sanitation8. ExcretaDown1. Wastewater2. Sewer5. Bacteria
Across3. Sewage4. Sludge6. Sanitation8. ExcretaDown1. Wastewater2. Sewer5. Bacteria7. Ozone
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