In a stream with zero DO, what is the expected predominant microbial activity?

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Study for the ADEQ Wastewater Treatment Level 1 Test. Access a wealth of multiple choice questions with explanations and practice for success. Prepare effectively for your forthcoming exam!

Multiple Choice

In a stream with zero DO, what is the expected predominant microbial activity?

Explanation:
When dissolved oxygen is absent, microbes can’t rely on aerobic respiration. In anoxic conditions, anaerobic bacteria take over, using alternative electron acceptors (like nitrate or sulfate) or fermenting organic matter to release energy. This shift to anaerobic metabolism is why anaerobic bacteria are the predominant activity in a stream with zero DO. Fungi and algae typically need oxygen (and algae also need light), so they don’t dominate when oxygen isn’t available.

When dissolved oxygen is absent, microbes can’t rely on aerobic respiration. In anoxic conditions, anaerobic bacteria take over, using alternative electron acceptors (like nitrate or sulfate) or fermenting organic matter to release energy. This shift to anaerobic metabolism is why anaerobic bacteria are the predominant activity in a stream with zero DO. Fungi and algae typically need oxygen (and algae also need light), so they don’t dominate when oxygen isn’t available.

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