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Preview questions
1. What is wastewater?
Water used for drinking · Water that has been used and contaminated · Rainwater · Water from rivers
2. Which of the following is a source of wastewater?
Household activities · Freshwater lakes · Rainwater harvesting · Groundwater
3. What is the first step in the treatment of wastewater?
Filtration · Sedimentation · Chlorination · Aeration
4. Which process involves the removal of large solids from wastewater?
Sedimentation · Filtration · Primary treatment · Secondary treatment
5. What is the purpose of chlorination in wastewater treatment?
To remove solids · To kill harmful bacteria · To add nutrients · To change the color
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