2) A new environmental engineering company comes to you to get an advice on incinerator system. They would like to use a mixed of hazardous waste and primary fuel as a feed for a boiler in the plant. The hazardous waste containing 70wt% of sand and 30wt% of polychlorinated biphenyls (PCB) is to be cleaned by combustion with the excess of hexane in order to produce a feed that is 60% combustible by weight. An oxygen-enriched air stream comprising 40mol% of oxygen and 60mol% of nitrogen is supplied to the incinerator in order produce high temperature operation. The exit gas from the incinerator is found to contain a 16.5mol% of carbon dioxide and 12.2% of oxygen. a. Draw a complete process flow diagram (labelled appropriately) and write chemical reaction equation(s) that would take place in the system. (10 marks) b. Perform a complete degree of freedom analysis (5 marks) 2 KKKR1123/KKPK1133 c. The company would like to know the amount of hexane would be required to decontaminate 5000kg of the contaminated sand. Calculate the amount of hexane required. (5 marks) d. Find the complete exit gas concentrations. (10 marks) e. Calculate the percentage of oxygen excess used in the reactions