Question detail
What is anaerobic digestion of sewage sludge and what are its main products?
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 anaerobic digestion of sewage sludge and what are its main products?
Answer
Anaerobic digestion of sewage sludge is a biological process where microorganisms break down organic matter in the absence of oxygen. The main products of this process are biogas, which can be used as a renewable energy source, and digestate, which can be used as a fertilizer.
Explanation
A strong answer should directly address the approved learning objective to describe anaerobic digestion of sewage sludge. 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
Misunderstanding Anaerobic Digestion
Students often confuse anaerobic digestion with aerobic processes, thinking that oxygen is required for the breakdown of sewage sludge.
Remember that anaerobic digestion occurs in the absence of oxygen, allowing bacteria to break down organic matter in sewage sludge.
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