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Questions and Answers
Define sewage.
Define sewage.
A complex mixture containing suspended solids, organic and inorganic impurities, nutrients, and disease-causing bacteria and other microbes.
What is wastewater?
What is wastewater?
Contaminated water after activities like washing, bathing, and mopping.
What is the composition of sewage?
What is the composition of sewage?
It includes organic impurities (animal waste, urea, etc.), inorganic impurities (metals, phosphates), bacteria (cholera, typhoid), nutrients (nitrogen, phosphorus), and other disease-causing microbes.
What is a sewer?
What is a sewer?
Explain sewage treatment.
Explain sewage treatment.
What is the purpose of wastewater treatment?
What is the purpose of wastewater treatment?
What are the three main stages of water treatment described in the text?
What are the three main stages of water treatment described in the text?
Why should cooking oil and fats not be thrown down the drain?
Why should cooking oil and fats not be thrown down the drain?
What are the potential consequences of throwing paints, solvents, insecticides, motor oil, and medicines down the drain?
What are the potential consequences of throwing paints, solvents, insecticides, motor oil, and medicines down the drain?
Why should solid food remains, soft toys, and sanitary towels not be thrown in drains?
Why should solid food remains, soft toys, and sanitary towels not be thrown in drains?
What are the consequences of poor sanitation, according to the text?
What are the consequences of poor sanitation, according to the text?
Where do large numbers of people defecate in the open, according to the text?
Where do large numbers of people defecate in the open, according to the text?
What is the significance of proper sanitation in public areas such as railway stations, bus depots, and airports?
What is the significance of proper sanitation in public areas such as railway stations, bus depots, and airports?
What is the purpose of the waste water treatment plant (WWTP) described in the text?
What is the purpose of the waste water treatment plant (WWTP) described in the text?
What happens to the water in the large tank in the waste water treatment plant?
What happens to the water in the large tank in the waste water treatment plant?
How is water decomposed in the waste water treatment plant?
How is water decomposed in the waste water treatment plant?
Flashcards
Sewage
Sewage
A complex mixture of suspended solids, impurities, and microbes.
Wastewater
Wastewater
Contaminated water from activities like washing or bathing.
Composition of sewage
Composition of sewage
Includes organic and inorganic impurities, bacteria, nutrients, and microbes.
Sewer
Sewer
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Sewage treatment
Sewage treatment
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Purpose of wastewater treatment
Purpose of wastewater treatment
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Stages of water treatment
Stages of water treatment
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Disposing of cooking oil
Disposing of cooking oil
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Consequences of improper disposal
Consequences of improper disposal
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Food waste in drains
Food waste in drains
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Consequences of poor sanitation
Consequences of poor sanitation
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Open defecation areas
Open defecation areas
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Significance of sanitation in public areas
Significance of sanitation in public areas
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Wastewater treatment plant (WWTP) function
Wastewater treatment plant (WWTP) function
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Settling of solids in WWTP
Settling of solids in WWTP
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Water decomposition in WWTP
Water decomposition in WWTP
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Study Notes
- Wastewater is contaminated water resulting from various activities like washing, bathing, mopping, etc.
- Wastewater treatment is the process of cleaning water by removing pollutants before it enters a water body or is reused.
- Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, bacteria, and other microbes.
- Organic impurities in sewage include animal waste, urea, pesticides, herbicides, fruits, vegetables, etc. Inorganic impurities consist of metals, phosphates, nitrates.
- Sewage treatment involves several processes such as aeration, filtration, and chlorination.
- A sewer is a pipe that carries wastewater. Sewerage is a network of big and small pipes called sewers.
- In sewage treatment, water is passed through screens to remove large objects, then to a grit and sand removal tank.
- Water is then allowed to settle in a large tank where solids settle at the bottom and are removed.
- Water is decomposed by anaerobic bacteria in a tank and air is passed. Microbes settle down at the bottom as activated sludge and water from the top is removed.
- Better housekeeping practices include not throwing cooking oil, fats, paints, solvents, insecticides, etc., down the drain.
- Solid food remains, soft toys, sanitary towels, etc., should be thrown in the dustbin instead of drains.
- Poor sanitation leads to numerous diseases and both water and soil get polluted.
- Large amounts of waste are generated in public places like railway stations, bus depots, and airports, and must be disposed of properly to prevent epidemics.
- We should throw litter in dustbins instead of public places.
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Description
Test your knowledge on the topics covered in Chapter 18 'Wastewater Story' of Class 7th Science. Explore concepts such as wastewater, sewage treatment, wastewater treatment plants, sanitation, and more.