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<p class="text-center"><font size="4"> One is insufficient dissolved oxygen in the medium. Dissolved oxygen refers to the dissolved oxygen in the molecular state of water. Since oxygen is undissolved gas, under the condition of normal pressure, 25 ° C, oxygen solubility in the water in the air is only about 0.25 tendency for L. Therefore, if the outside world cannot supply oxygen in time during the fermentation process, the amount of dissolved oxygen in the water can only maintain a very short period of normal respiration of the bacteria, it will be exhausted. Therefore, it is necessary to constantly introduce sterile air into the fermentation system and further disperse it by stirring in the fermentation tank, so as to maintain a moderate concentration of dissolved oxygen in the fermentation liquid, but sometimes it is still unable to meet the oxygen demand of fermentation production. With the increase of fermentation tank volume, the raw material and power consumption of the fermentation process have increased to a large extent, and the demand for oxygen is also increasing.</font></p> | <p class="text-center"><font size="4"> One is insufficient dissolved oxygen in the medium. Dissolved oxygen refers to the dissolved oxygen in the molecular state of water. Since oxygen is undissolved gas, under the condition of normal pressure, 25 ° C, oxygen solubility in the water in the air is only about 0.25 tendency for L. Therefore, if the outside world cannot supply oxygen in time during the fermentation process, the amount of dissolved oxygen in the water can only maintain a very short period of normal respiration of the bacteria, it will be exhausted. Therefore, it is necessary to constantly introduce sterile air into the fermentation system and further disperse it by stirring in the fermentation tank, so as to maintain a moderate concentration of dissolved oxygen in the fermentation liquid, but sometimes it is still unable to meet the oxygen demand of fermentation production. With the increase of fermentation tank volume, the raw material and power consumption of the fermentation process have increased to a large extent, and the demand for oxygen is also increasing.</font></p> | ||
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Revision as of 15:13, 11 October 2018