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2 marksWater and Land Pollution

CAPE Environmental Science Unit 2 · 2012 · Paper 2 · Question 5(a)(iii)

MODULE 3: Environmental Pollution questions. Figure 6 illustrates BOD levels in the effluent of a sewage treatment plant over a two-month period during which malfunctions occurred.

Explain how you arrived at the answer to (a)(ii).

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 5(a)(i)Define the term 'BOD'.[3 marks]
  2. 5(a)(ii)How many times during the monitoring period was the sewage treatment plant malfunctioning?[1 mark]
  3. 5(a)(iv)What were the first and last days of the LONGEST plant malfunction?[2 marks]
  4. 5(a)(v)On average, what was the BOD concentration when the plant was operating normally?[1 mark]
  5. 5(b)(i)Describe the pathway of heavy metal pollution in this section of the river, and use this information to explain why the concentration of heavy metals is much…[5 marks]
  6. 5(b)(ii)Fully discuss ONE possible environmental impact of the effluent from the sewage treatment plant on the river.[6 marks]

More practice: the rest of this paper · more Water and Land Pollution questions · all CAPE Environmental Science Unit 2 past papers