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Questions and Answers
What is the primary reason that drinking water sources require treatment before distribution?
What is the primary reason that drinking water sources require treatment before distribution?
- To dilute the concentration of pollutants
- To remove contaminants resulting from land erosion and the decay of organic vegetation (correct)
- To increase the water's shelf life
- To add minerals for better taste
Which process is generally used to remove dissolved minerals like hardness components and iron and manganese?
Which process is generally used to remove dissolved minerals like hardness components and iron and manganese?
- Ion exchange
- Chemical precipitation (correct)
- Removal by coagulation generally followed by filtration
- Plain sedimentation
What are natural waters likely to contain?
What are natural waters likely to contain?
- Only suspended inorganic material
- Dissolved inorganic and organic substances, biological forms, and suspended inorganic material (correct)
- Suspended organic substances
- Only dissolved inorganic substances
Which unit process is generally used for the removal of dissolved substances in water?
Which unit process is generally used for the removal of dissolved substances in water?
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What contributes to the increasing need for treatment of drinking water sources?
What contributes to the increasing need for treatment of drinking water sources?
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Study Notes
Drinking Water Treatment
- Drinking water sources require treatment before distribution because they may contain harmful substances, pathogens, and other contaminants that can affect human health.
Removal of Dissolved Minerals
- Ion exchange is generally used to remove dissolved minerals like hardness components (calcium and magnesium) and iron and manganese from drinking water.
Natural Water Composition
- Natural waters are likely to contain dissolved substances, suspended particles, and microorganisms, which can affect their taste, odor, and quality.
Removal of Dissolved Substances
- Reverse osmosis is a unit process that is generally used for the removal of dissolved substances in water.
Increasing Need for Treatment
- The increasing need for treatment of drinking water sources is contributed by factors such as population growth, urbanization, and climate change, which can lead to contamination of water sources and affect the quality of drinking water.
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