Question detail
Describe the role of sedimentation in the treatment of sewage sludge and 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
Describe the role of sedimentation in the treatment of sewage sludge and effluent.
Answer
Sedimentation allows heavier solids in sewage to settle out of the liquid, separating sludge from the clearer effluent. This reduces the load on subsequent biological treatment stages and helps recover useful sludge for disposal or reuse.
Explanation
A strong answer should directly address the approved learning objective to interpret information about waste water treatment processes. 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 waste water, and keeps the wording specific to AQA GCSE revision.
Common mistake
Misunderstanding Waste Water Treatment Steps
Students often confuse the stages of waste water treatment, thinking that all processes happen simultaneously rather than sequentially.
Review the specific stages of waste water treatment, such as screening, sedimentation, and biological treatment, and understand their order and purpose.
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