Question

Bacterial-algae symbiosis is associated with:

• A. {Oxidation pond}
• B. {Oxidation ditch}
• C. {Activated sludge process}
• D. {Rotating biological contactor}

Hint:

Oxidation ponds use bacterial-algae symbiosis, where bacteria break down waste and algae provide oxygen.

Answer 1

The Correct Option is A

Step 1: Oxidation ponds (also called stabilization ponds) rely on the mutualistic symbiosis between bacteria and algae. Step 2: - Bacteria decompose organic matter and release \( CO_2 \). - Algae use this \( CO_2 \) for photosynthesis and release \( O_2 \), which supports bacterial respiration. Step 3: This natural treatment system is common in wastewater lagoons and is used for secondary treatment. Thus, the correct answer is (A) Oxidation pond.