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1 markWater and Land Pollution

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

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.

How long did it take for the TPH level to drop to 60% of its initial level?

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Other parts of this question

  1. 9(a)(i)Define the term 'bioremediation'.[2 marks]
  2. 9(a)(iii)What was the loss in actual TPH concentration by the end of the study?[2 marks]
  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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