10 Questions
Which type of impurities occur in three progressively finer states?
Suspended, colloidal, and dissolved
What is the purpose of pre-treatment in water purification?
To alter the composition of raw water
Which process involves the use of screens in water treatment?
Raw water storage
What is the main purpose of aeration in pre-treatment of water?
To increase oxygen content
Why is it often necessary to use more than one treatment process in water purification?
To achieve the desired change in quality
Which of the following are the four main components of the environment mentioned in the text?
Atmosphere, hydrosphere, lithosphere, biosphere
What are the two main categories of pollutants mentioned in the text?
Biodegradable and non-biodegradable
Which of the following is not mentioned as a source of pollution in the text?
Nuclear waste
What is the impact of pollution on non-living things as mentioned in the text?
Acid rain
What is the function of the assimilative capacity of natural sources as mentioned in the text?
To absorb and neutralize pollutants
Study Notes
Water Purification
- Impurities in water occur in three progressively finer states: coarse, fine, and dissolved.
Pre-Treatment
- The purpose of pre-treatment in water purification is to remove large and suspended impurities.
Screening
- Screening is a process that involves the use of screens in water treatment to remove coarse impurities.
Aeration
- The main purpose of aeration in pre-treatment of water is to remove dissolved gases and volatile compounds.
Multiple Treatment Processes
- It is often necessary to use more than one treatment process in water purification because different processes are effective for different types of impurities.
Environmental Components
- The four main components of the environment mentioned in the text are air, water, land, and living organisms.
Categories of Pollutants
- The two main categories of pollutants mentioned in the text are biodegradable and non-biodegradable pollutants.
Sources of Pollution
- Radioactive waste is not mentioned as a source of pollution in the text.
Impact of Pollution
- Pollution can alter the physical and chemical properties of non-living things.
Assimilative Capacity
- The assimilative capacity of natural sources refers to their ability to absorb and break down pollutants without being harmed.
Test your knowledge of water purification and pre-treatment with this quiz. Explore the nature of impurities in water, types of treatment processes, permissible quality of raw water, and pre-treatment methods. Sharpen your understanding of physical, chemical, and biological treatment processes.
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