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Question 1: A toxic substance (A) is contained in the wastewater from a chemical production plant. Batches of wastewater are dumped in a holding tank
Question 1: A toxic substance (A) is contained in the wastewater from a chemical production plant. Batches of wastewater are dumped in a holding tank and treated with a biological agent that decomposes the hazardous substance into products generally known to be harmless. The decomposition rate is proportional to the concentration of A in the tank; that is, rA (kg A reacting/liter-s) =kCA where k is the rate constant and CA(kg/liter) is the concentration of A in the tank. Once the concentration of A falls below a minimum value Cmin, the contents of the tank are pumped into the river that flows past the plant. The tank processes a single batch of wastewater at a time. You are the process engineer in charge of hazardous waste disposal. Your tasks are to calculate the minimum holding time from the moment the waste enters the tank to the moment the tank contents are discharged, and in general to review the procedure for feasibility and safety. a) Define the quantities you would have to know to determine the minimum holding time. Then suggest ways to obtain values of these quantities. b) Derive an expression for the minimum holding time in terms of the quantities specified in part (a)
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