Abstract
AbstractA bubble column (tower) fermenter was used to study the growth of Aspergillus niger on olive mill wastewaters (OMW). The gas hold‐up, mixing time and oxygen transfer coefficient values were studied in terms of superficial air velocity. These characteristics were clearly affected by OMW. The growth of A. niger resulted in a filamentous suspension with no pellet formation and the specific growth rate was 0–2 h−1. The growth rate was limited by the oxygen transfer rate at 90 mmol dm−3 h−1 when pO2 was lower than 2%.
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