QUESTION 1 Consider a combined photoassited-biodegradation system, consisting of a photoassisted reactor followed by a biological reactor where the extent of dehalogenation and degradation of 4-chlorophenol is evaluated. The following reaction is taking place in the photoassisted reactor: 4-chlorophenol + H2O2 Intermediates products 1.1 Identify the control objectives for the operation of a combined photoassited- biodegradation system. (3) 1.2 Classify the variables of the combined photoassited-biodegradation system into inputs and outputs. Also classify the inputs into manipulated and disturbances variables and the outputs into measured and unmeasured outputs. (8) 1.3 Suggest with reasoning, which system is easier to control, the combined photoassited-biodegradation system shown or an equivalent one-reactor system that (4) achieves the same conversion? HO Intermediates Products Photoassited reactor 4-Chlorophenol steam Biological reactor 2