Lesson Note: Purifying Water (BST, BASIC 3, Hybrid Curriculum)
Introduction:
Water is essential for human survival, but it can contain harmful substances that can cause diseases. Purifying water is the process of removing these substances to make water safe for drinking. In this lesson, we will discuss the reasons for purifying water and the methods used to purify water.
Reasons for Purifying Water:
- Removal of Harmful Substances: Water can contain harmful substances like bacteria, viruses, and parasites that can cause diseases like cholera, typhoid, and diarrhea.
- Prevention of Water-Borne Diseases: Purifying water helps to prevent the spread of water-borne diseases, which can be fatal if not treated promptly.
- Improvement of Taste and Odor: Purifying water can improve its taste and odor, making it more pleasant to drink.
- Protection of the Environment: Purifying water helps to protect the environment by removing pollutants and contaminants that can harm aquatic life.
Methods of Purifying Water:
- Boiling: Boiling water is a simple and effective method of purifying water. It involves heating water to a high temperature to kill bacteria, viruses, and other microorganisms.
- Filtration: Filtration involves passing water through a filter to remove impurities and contaminants. Examples of filters include sand filters, ceramic filters, and membrane filters.
- Chlorination: Chlorination involves adding chlorine to water to kill bacteria, viruses, and other microorganisms.
- Solar Disinfection (SODIS): SODIS involves exposing water to sunlight in a clear plastic bottle to kill bacteria, viruses, and other microorganisms.
Examples:
- Boiling: A family boils water before drinking it to kill bacteria and other microorganisms.
- Filtration: A water treatment plant uses a sand filter to remove impurities from water.
- Chlorination: A water treatment plant adds chlorine to water to kill bacteria and other microorganisms.
- SODIS: A person exposes water to sunlight in a clear plastic bottle to kill bacteria and other microorganisms.
Class Work:
Match the following methods of purifying water with their examples:
| Method | Example |
|---|
| Boiling | A water treatment plant uses a sand filter |
| Filtration | A family boils water before drinking it |
| Chlorination | A person exposes water to sunlight in a clear plastic bottle |
| SODIS | A water treatment plant adds chlorine to water |
Assignment:
Write a short essay on the importance of purifying water and describe one method of purifying water that you think is effective. Be sure to provide examples to support your answer.
Note: Please complete the class work and assignment and submit them to your teacher for feedback.
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