Question: In this practical, ozonated water (2 ppm) is used to sanitise green leaf lettuce against the commercial practice (treatment of aqueous chlorine 100 ppm). The

In this practical, ozonated water (2 ppm) is used to sanitise green leaf lettuce against the commercial practice (treatment of aqueous chlorine 100 ppm). The aqueous ozone is produced by using a portable ozone generator, which produces ozone by the corona discharge method.

a) Describe how the corona discharge method works. (7.5 marks; word limit range: 150 - 200)

b) Describe the mechanism of microbial inactivation of ozone. (7.5 marks; word limit range: 100 - 200)

c) Explain why it is essential to clean (wash and dry) the sample before ozone treatment regarding the disinfection efficacy of ozone. (5 marks; word limit range: 100 - 200)

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