In which type of bioreaction air bubbles dramatically increases the oxygen transger area ?

Options

A. Simple stirred tank bioreactor
B. Sparged stirred tank bioreactor
C. Both 1 & 2
D. None of these

Answer

To solve the question, "In which type of bioreaction do air bubbles dramatically increase the oxygen transfer area?", we can follow these steps:

### Step 1: Understand the Types of Bioreactors
We need to identify the two types of bioreactors mentioned in the question:
1. Simple stirred tank bioreactor
2. Sparged stirred tank bioreactor

### Step 2: Analyze the Simple Stirred Tank Bioreactor
In a simple stirred tank bioreactor:
- There is no gas sparging or introduction of air bubbles.
- The mixing is done solely by stirring.
- As a result, there is no increase in the oxygen transfer area since no bubbles are formed.

### Step 3: Analyze the Sparged Stirred Tank Bioreactor
In a sparged stirred tank bioreactor:
- Air or gas is introduced into the bioreactor, creating bubbles.
- These bubbles increase the surface area for oxygen transfer significantly.
- The agitation helps in dispersing these bubbles throughout the liquid, enhancing the oxygen transfer efficiency.

### Step 4: Compare the Two Bioreactors
From the analysis:
- The simple stirred tank bioreactor does not facilitate oxygen transfer through bubbles.
- The sparged stirred tank bioreactor dramatically increases the oxygen transfer area due to the presence of air bubbles.

### Step 5: Determine the Correct Answer
Based on the information gathered:
- The correct answer is the sparged stirred tank bioreactor, as it is the one that utilizes air bubbles to enhance oxygen transfer.

### Final Answer
The type of bioreaction in which air bubbles dramatically increase the oxygen transfer area is the **sparged stirred tank bioreactor**.

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