state all the necessary assumption

(10 marks) (b) Neutralization of an acidic effluent is a very important task in wastewater treatment plants. Figure 2 depicts such a process. Wastewater Stream Standard Basc Stream Neutralized Stream Figure 2 pH Neutralization Tank The incoming waste stream contains mixed acids with varying pH (pH of continuous flow from an upstream part of the process, measured at different time intervals) and a standard base stream is available for neutralization. (i) State the control objective for this process (1 mark) (ii) What are the possible output, manipulated and disturbance variables? (4 marks) (iii) Suggest a feedback and a feedforward control scheme for the process, (5 marks) QUESTION 5