Which of the following activated sludge process has minimum food to microorganism ratio?a)Extended aerationb)Step aerationc)Modified aerationd)ConventionalCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

Extended Aeration
Extended aeration activated sludge process typically has a minimum food to microorganism ratio compared to other activated sludge processes. This process involves providing a long aeration period (typically 24 hours or more) to allow for the slow growth of microorganisms. Here's why extended aeration has a minimum food to microorganism ratio:

Low Organic Loading Rates:
- Extended aeration systems are designed to operate at low organic loading rates, meaning that the amount of organic matter (food) supplied to microorganisms is limited. This helps maintain a balanced microbial population without an excess of food.

Long Aeration Time:
- The extended aeration process provides microorganisms with a longer contact time with organic matter in the wastewater, allowing for gradual and controlled decomposition. This extended aeration period ensures that microorganisms have sufficient time to consume the available food without overwhelming them.

Stable Microbial Community:
- By maintaining a minimum food to microorganism ratio in extended aeration systems, a stable microbial community can be established. This stable population can effectively treat wastewater and reduce the risk of process upsets.
In summary, the extended aeration activated sludge process is characterized by low organic loading rates and long aeration times, resulting in a minimum food to microorganism ratio. This approach helps promote the growth of a balanced microbial community and ensures efficient wastewater treatment.

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