Practice question

Question

Aspergillus niger is grown in a 10,000 L stirred batch bioreactor under aerated conditions to produce citric acid. At steady state oxygen transfer conditions, the specific oxygen uptake rate of the organism and the volumetric mass transfer coefficient are 1×10-4 𝑔 𝑜𝑥𝑦𝑔𝑒𝑛 𝑐𝑜𝑛𝑠𝑢𝑚𝑒𝑑𝑔 𝑏𝑖𝑜𝑚𝑎𝑠𝑠 s-1 and 60 min-1, respectively. If the oxygen solubility is 8×10-3 kg m-3 under the operating conditions, based only on oxygen dynamics, the maximum possible cell concentration is ________kg m-3 (Answer in integer)