Filter cake from the above process (Question 2 ) contains a certain amount of hexane. Hexane is toxic which causes the filter cake to be categorized as hazardous waste. Hence it must be properly treated before disposal. Suggest the treatment which can be done and the hexane can be recycled to the production process. Add the waste treatment unit together with the recycle stream to the main process flow diagram (Figure 1) and present the modified process flow diagram. (6 marks) Filter cake from the above process (Question 2 ) contains a certain amount of hexane. Hexane is toxic which causes the filter cake to be categorized as hazardous waste. Hence it must be properly treated before disposal. Suggest the treatment which can be done and the hexane can be recycled to the production process. Add the waste treatment unit together with the recycle stream to the main process flow diagram (Figure 1) and present the modified process flow diagram. (6 marks)