AQA · Chemistry · 8462
GCSE Chemistry: Waste water treatment
Using resources · AQA GCSE Chemistry (8462), specification point 4.10.1.3. Cards are generated from the exam board's own specification for "Waste water treatment", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Why does urban and industrial waste water need treatment before release into the environment?
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It contains organic matter, harmful microbes and/or harmful chemicals that would pollute the environment.
What must be removed from sewage and agricultural waste water before release?
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Organic matter and harmful microbes.
What may need to be removed from industrial waste water before release?
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Organic matter and harmful chemicals.
What is the first stage of sewage treatment?
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Screening and grit removal — large solids and grit are filtered out.
What two products does sedimentation of sewage produce?
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Sewage sludge (settled solids) and effluent (the liquid above).
In sewage treatment, sewage sludge is broken down by ? digestion.
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anaerobic
In sewage treatment, effluent undergoes ? biological treatment.
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aerobic
Which part of sewage is treated by anaerobic digestion: the sludge or the effluent?
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The sewage sludge. The effluent is treated aerobically.
Which source is the easiest to turn into potable water: waste water, ground water or salt water?
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Ground water — it needs only filtration and sterilisation.
Why is obtaining potable water from salt water relatively difficult?
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It requires desalination (distillation or reverse osmosis), which uses large amounts of energy.
Why is obtaining potable water from waste water more difficult than from ground water?
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Waste water needs several treatment stages to remove organic matter, harmful microbes and chemicals before it can be made safe to drink.
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