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Question 6 a) List the four commonly used membrane filtration processes for the production of potable water. [4 Marks] b) Write the photoreactions of ozone. [4 Marks] c) Write the chemical reactions that occur during the ozone destruction by chlorofluoromethane. d) Coal is burned at a rate of 1.00kgs1. If the analysis of the coal reveals a sulphur content of 3.00%, what is the annual rate of emission of SO2 ? Because the combustion process is not 100% efficient, we generally assume that 5% of the sulphur in the fuel ends up in the ash. [8 Marks] e) Discuss the Economics of loss and waste. [5 Marks]