The bacteria X-II can be described by a simple Monod equation with µₘₐₓ = 0.8 h -1 and Kₘ = 4 g/dm3 , Yₚ/꜀ = 0.2 g/g, Yₛ/꜀ = 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. What is the exiting concentration and the size of fermentor is needed to achieve 90% conversion of the substrate?