Question detail
Which method is typically used to separate sewage sludge from effluent during sewage treatment?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. Filtration
- B. Sedimentation
- C. Chlorination
- D. Aeration
Answer
The correct option is Sedimentation. This answer is correct because it matches the approved learning objective to compare the relative ease of obtaining potable water from waste water, ground water and salt water in the subtopic Waste water treatment.
Explanation
The correct option is Sedimentation. Sedimentation is correct because it directly supports the approved learning objective to compare the relative ease of obtaining potable water from waste water, ground water and salt water. This belongs to the subtopic Waste water treatment within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Waste water treatment.
Common mistake
Confusing Water Sources
Students often confuse the ease of obtaining potable water from waste water with that from ground water and salt water, thinking they are equally easy to treat.
Do not treat this as a general statement about waste water. Instead, answer by clearly linking the correction to compare the relative ease of obtaining potable water from waste water, ground water and salt water in Waste water treatment. This keeps the response inside Using the Earth's resources and obtaining potable water and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often confuse the ease of obtaining potable water from waste water with that from ground water and salt water, thinking they are equally easy to treat.
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