1.
Fill in the blanks:
(a) Cleaning of water is process of removing contaminants .
(b) Wastewater released by houses is called sewage .
(c) Dried dung is used as manure.
(d) Drains get blocked by plastic and sludge .
2.What is sewage? Explain why it is harmful to discha rge untreated sewage into rivers or seas.
2. Sewage is wastewater released by homes, industries, hospitals, offices and other users. It includes rainwater that has run down the street during a storm or heavy rain. The untreated sewage may contain harmful chem icals that may kills the organisms growing in water. The sewage also contain s nutrients that cause growth of algae and leads to scarcity of oxygen. That is w hy it is harmful to discharge untreated sewage into rivers or seas.
3.Why should oils and fats be not released in the dra in? Explain.
3. Oil does not mix with water. Being lighter, oil flo ats on water. This prevents mixing of water and air. These reduce oxygen supply for aq uatic plants and animals.
4.Why should oils and fats be not released in the dra in? Explain.
4. Treatment of wastewater involves physical, chemical and biological processes.
(a) Waste water is passed through bar screens to remove large objects like rags, sticks, cans, plastic packets, napkins etc.
(b) Water is passed to a grit and sand removal tank to allow sand, grit and pebbles to settle down.
(c) The water is then allowed to large settling tank t o permit settling of solid faeces called sludge, which is removed using scarper.
(d) Air is pumped into the clarified water to help aero bic bacteria to grow and consume the wastes.
(e) This type of water is discharged into rivers or pon ds.
5.Why should oils and fats be not released in the dra in? Explain.
5. Solid wastes faeces settle at the bottom and are re moved with scrapper. This is sludge. A skimmer removes the floatable solids like oil and grease. Water so cleared is called clarified water. Sludge is transferred to a seperte tank where it is decomposed by the anaerobic bacteria. The biomass produced in the process can b e used as fuel or can be used to produce electricity.
6.Why should oils and fats be not released in the dra in? Explain.
6. Untreated human excreta is a health hazard. It may cause water pollution and soil pollution. Both the surface water and ground water get polluted. Ground water is a source of water for wells, tube wells, springs etc. thus, it becomes the most common route for water borne disease. This includes choler a, typhoid, polio etc.
7.Why should oils and fats be not released in the dra in? Explain.
7. Ozone, chlorine.
8.Why should oils and fats be not released in the dra in? Explain.
8. Waste water is passed through bar screens. Large ob jects like rags, sticks, cans, plastics and napkins are removed.
9.Why should oils and fats be not released in the dra in? Explain.
9. Sanitation and disease are related to each other. T o remain disease fee, we must observe sanitation. Clean environment is essential for preventing the growth of disease causing microbes. Dirty water around the li ving areas provides breeding ground for mosquito that are vectors of a number of disease. Sanitation prevents the growth of pathogens that cause disease.
10.Why should oils and fats be not released in the dra in? Explain.
10. We all have a role to play in keeping our environme nt clean and healthy. We must realize our responsibility in maintaining the water sources in the healthy state. Adopting good sanitation practices should be our wa y of life. As an agent of change our individual initiative will make a great differe nce. We can influence others with our energy, ideas and optimism. A lot can be done i f people work together. There is great power in collective action.
(a) Cleaning of water is process of removing contaminants .
(b) Wastewater released by houses is called sewage .
(c) Dried dung is used as manure.
(d) Drains get blocked by plastic and sludge .
2.What is sewage? Explain why it is harmful to discha rge untreated sewage into rivers or seas.
2. Sewage is wastewater released by homes, industries, hospitals, offices and other users. It includes rainwater that has run down the street during a storm or heavy rain. The untreated sewage may contain harmful chem icals that may kills the organisms growing in water. The sewage also contain s nutrients that cause growth of algae and leads to scarcity of oxygen. That is w hy it is harmful to discharge untreated sewage into rivers or seas.
3.Why should oils and fats be not released in the dra in? Explain.
3. Oil does not mix with water. Being lighter, oil flo ats on water. This prevents mixing of water and air. These reduce oxygen supply for aq uatic plants and animals.
4.Why should oils and fats be not released in the dra in? Explain.
4. Treatment of wastewater involves physical, chemical and biological processes.
(a) Waste water is passed through bar screens to remove large objects like rags, sticks, cans, plastic packets, napkins etc.
(b) Water is passed to a grit and sand removal tank to allow sand, grit and pebbles to settle down.
(c) The water is then allowed to large settling tank t o permit settling of solid faeces called sludge, which is removed using scarper.
(d) Air is pumped into the clarified water to help aero bic bacteria to grow and consume the wastes.
(e) This type of water is discharged into rivers or pon ds.
5.Why should oils and fats be not released in the dra in? Explain.
5. Solid wastes faeces settle at the bottom and are re moved with scrapper. This is sludge. A skimmer removes the floatable solids like oil and grease. Water so cleared is called clarified water. Sludge is transferred to a seperte tank where it is decomposed by the anaerobic bacteria. The biomass produced in the process can b e used as fuel or can be used to produce electricity.
6.Why should oils and fats be not released in the dra in? Explain.
6. Untreated human excreta is a health hazard. It may cause water pollution and soil pollution. Both the surface water and ground water get polluted. Ground water is a source of water for wells, tube wells, springs etc. thus, it becomes the most common route for water borne disease. This includes choler a, typhoid, polio etc.
7.Why should oils and fats be not released in the dra in? Explain.
7. Ozone, chlorine.
8.Why should oils and fats be not released in the dra in? Explain.
8. Waste water is passed through bar screens. Large ob jects like rags, sticks, cans, plastics and napkins are removed.
9.Why should oils and fats be not released in the dra in? Explain.
9. Sanitation and disease are related to each other. T o remain disease fee, we must observe sanitation. Clean environment is essential for preventing the growth of disease causing microbes. Dirty water around the li ving areas provides breeding ground for mosquito that are vectors of a number of disease. Sanitation prevents the growth of pathogens that cause disease.
10.Why should oils and fats be not released in the dra in? Explain.
10. We all have a role to play in keeping our environme nt clean and healthy. We must realize our responsibility in maintaining the water sources in the healthy state. Adopting good sanitation practices should be our wa y of life. As an agent of change our individual initiative will make a great differe nce. We can influence others with our energy, ideas and optimism. A lot can be done i f people work together. There is great power in collective action.
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