4.1. A stirred-tank bioreactor has a volume of 2000 L and operates at a stirrer speed of 100 rpm. If the power input is 2 kW, what is the power per unit volume?

Solution: The main goals of bioprocess engineering are to develop efficient, cost-effective, and safe methods for producing valuable products using biological systems.

1.1. What are the main goals of bioprocess engineering?

2.1. A bioreactor contains 1000 L of medium with an initial cell concentration of 1 g/L. If 500 L of medium is added, what is the new cell concentration?

Solution: Power per unit volume = 2 kW / 2000 L = 0.001 kW/L or 1 W/L.