Q2) A feed substrate is fed into an anaerobic fed-batch bioreactor at a rate of 0.5t(m3/h), with t has the following characteristics: YXs=0.20g/g KS=0.12kg/m3 Kmax=0.12.31h1 ms=0.12kg/kgh Si=50kg/m3 (a) What was the initial culture volume, if after 10h of operation, the volume of the liquid in the reactor is 60m3 ? (b) What is the concentration of substrate after 15h of operation (assuming quasi-steady state conditions)