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Preview questions
1. What is wastewater?
Water that is clean and drinkable · Water that has been used and contaminated · Water that comes from rain · Water from rivers and lakes
2. Which of the following is a source of wastewater?
Household activities · Rainwater · Groundwater · Freshwater bodies
3. What process is used to treat wastewater?
Filtration · Evaporation · Sedimentation · All of the above
4. What is the first step in wastewater treatment?
Secondary treatment · Tertiary treatment · Primary treatment · Disinfection
5. What is removed during primary treatment?
Dissolved solids · Suspended solids · Bacteria · Nutrients
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