Question detail
What is the process of sedimentation in sewage treatment, and how does it separate sewage sludge from effluent?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Using the Earth's resources and obtaining potable water
Question
What is the process of sedimentation in sewage treatment, and how does it separate sewage sludge from effluent?
Answer
Sedimentation is a process where sewage is allowed to stand in a tank, causing solid particles, including sewage sludge, to settle at the bottom due to gravity. The liquid effluent, which is less dense, remains above the settled sludge and can be removed for further treatment.
Explanation
A strong answer should directly address the approved learning objective to explain how sedimentation separates sewage sludge from effluent. This question belongs to Waste water treatment within Using the Earth's resources and obtaining potable water, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to sewage, and keeps the wording specific to AQA GCSE revision.
Common mistake
Confusing Sedimentation with Filtration
Students often confuse sedimentation with filtration, thinking both processes remove solids from liquids in the same way.
Sedimentation relies on gravity to separate solids from liquids based on density, while filtration uses a barrier to physically separate solids from liquids.
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