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Preview questions
1. What is wastewater?
Water that is used and contaminated · Pure drinking water · Water from natural sources · Rainwater
2. Which of the following is NOT a source of wastewater?
Household activities · Industrial processes · Agricultural runoff · Freshwater lakes
3. What is the first step in the treatment of wastewater?
Filtration · Sedimentation · Chlorination · Aeration
4. Which process is used to remove solid impurities from wastewater?
Sedimentation · Evaporation · Distillation · Filtration
5. What is the purpose of chlorination in wastewater treatment?
To remove solids · To kill harmful bacteria · To add nutrients · To increase pH
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