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2 marksWater and Land Pollution

CAPE Environmental Science Unit 2 · 2010 · Paper 2 · Question 9(a)(iii)

A bioremediation study evaluated how a bacterial culture bioremediates oil-contaminated soil with an initial total petroleum hydrocarbon (TPH) level of 540 mg/kg, shown in Figure 8.

What was the loss in actual TPH concentration by the end of the study?

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Other parts of this question

  1. 9(a)(i)Define the term 'bioremediation'.[2 marks]
  2. 9(a)(ii)How long did it take for the TPH level to drop to 60% of its initial level?[1 mark]
  3. 9(a)(iv)How do you know that it was the new bacterial culture that accomplished the reduction indicated in Figure 8?[3 marks]
  4. 9(b)(i)Outline the functioning of incineration as a solid waste disposal technique.[2 marks]
  5. 9(b)(ii)Incineration is being considered in a number of Caribbean islands as an alternative to open landfills as a waste disposal technique. Discuss this proposal.…[10 marks]

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