Nitrate and sulfate are both available in an aerobic laboratory chemostat with b

Question

Nitrate and sulfate are both available in an aerobic laboratory chemostat with both nitrate-reducing and sulfate-reducing bacteria present. The chemostat is fed continuously a solution containing the electron acceptors in equal amounts glucose and a nutrient media. Which biological populations will remain after long-term operation? Explain. Nitrate and sulfate are both available in an aerobic laboratory chemostat with both nitrate-reducing and sulfate-reducing bacteria present. The chemostat is fed continuously a solution containing the electron acceptors in equal amounts glucose and a nutrient media. Which biological populations will remain after long-term operation? Explain.

Explanation / Answer

Since the condition is aerobic and electron acceptors are added continuously in the chemostat which makes the condition oxidizing, the process of sulfate reduction will be promoted and nitrate reduction process will decelerate. That is because nitrate reduction process occurs best in anaerobic conditions while sulfate reduction in aerobic oxidizing condition. Sulfate reducing bacteria will remain in the chemostat for long term.

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