QUESTION 3 A new venturi needs to be installed by Sasol in Secunda to enhance fly ash removal from flue gas as a means of ensuring the discharge to the atmosphere meets set guidelines. The flowrate of polluted gas to the venturi scrubber is 120m3/s (actual) with a total particulate concentration of 0.0105kg/m3 gas (actual). The pressure drop is 10kPa. The following particle size fractions and collection efficiency data were obtained via experimental studies: Table 3: Particle size fraction and collection efficiency Calculate the following: a. Overall efficiency of the unit. (8) b. Total mass of fly ash collected by the scrubbing liquid in ton/day. (5) c. Total mass of fly ash discharge to the atmosphere in ton/day. (3) 3 d. Particle size distribution of fly ash collected and discharged to the atmosphere. (9)