P9-18B The bacteria X-II can be described by a simple Monod equation with μmax = 0.8 h–1 and KS = 4 g/dm3, Yp/c = 0.2 g/g, and Ys/c = 2 g/g. The process is carried out in a CSTR in which the feed rate is 1000 dm3/h at a substrate concentration of 10 g/dm3.(a) What size fermentor is needed to achieve 90% conversion of the substrate? What is the exiting cell concentration?(b) How would your answer to (a) change if all the cells were filtered out and returned to the feed stream?