Question

From which of the following processes, only the input of the material is allowed but not output?

(a) Batch process

(b) Fed-Batch process

(c) Semi-Batch process

(d) Continuous process

This question was posed to me in an internship interview.

Asked question is from Thermodynamic Preliminaries in section Material Balance of Bioprocess Engineering

Answer 1

The correct option is (b) Fed-Batch process

The best I can explain: In fed-batch process, nothing is removed from the reactor during the process, but one substrate component is added in order to control the reaction rate by its concentration. In a fed-batch process, a basal medium supports initial growth and production, and a feed medium prevents depletion of nutrients and sustains the production phase.