Water Pollution — Chapter Summary
Telangana Open School (TOSS) · Class 12 · Chemistry
Summary of Water Pollution for Telangana Open School (TOSS) Class 12 Chemistry. Part of the Telangana Open School (TOSS) Class 12 Chemistry syllabus.
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Overview
Water is essential for all life forms, but increasing human activities are polluting water sources at an alarming rate. This chapter explores how water becomes polluted, the various types and sources of pollutants, and their harmful effects on aquatic life and human health. It also explains key scie
Key Concepts
Water pollution occurs when harmful substances
Water pollution occurs when harmful substances contaminate water bodies such as rivers, lakes, or groundwater, making the water unsafe for use. This c
BOD is the amount of oxygen
BOD is the amount of oxygen required by microorganisms to break down organic matter in water over a period of 3 days at 27°C. Higher BOD means more or
It is the process where excess
It is the process where excess nutrients like nitrates and phosphates enter water bodies, causing rapid growth of algae. When these algae die, their d
Toxic chemicals like DDT and mercury
Toxic chemicals like DDT and mercury enter the food chain through water and increase in concentration at each higher level. For example, small amounts
Polluted water is treated in three
Polluted water is treated in three stages: Primary (removal of solids), Secondary (biological breakdown of organic matter), and Tertiary (disinfection
Learning Objectives
- List Earth's water resources
- Define water pollution and its different parameters
- Identify major types of water pollutants, their sources, and effects
- Distinguish between natural and man-made pollutants
- Understand biological oxygen demand (BOD) and its significance
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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