What dos BOD and COD stands for ?

Explanation

**Step-by-Step Solution:**

1. **Understanding BOD:**
- BOD stands for **Biochemical Oxygen Demand**.
- It refers to the amount of oxygen that is consumed by bacteria and other microorganisms while they decompose organic matter in water bodies.
- This process occurs under **aerobic conditions**, meaning that oxygen is present.
- The measurement is typically taken at a specific temperature, usually 20 degrees Celsius, over a set period (commonly 5 days).

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