Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste into natural surface water, is

Options

A. `lt 3.0` ppm
B. `lt 10` ppm
C. `lt 100` ppm
D. `lt 30` ppm

Explanation

To answer the question regarding the limit of BOD (Biochemical Oxygen Demand) prescribed by the Central Pollution Control Board (CPCB) for the discharge of industrial and municipal waste into natural surface water, follow these steps:

### Step-by-Step Solution:

1. **Understand BOD**: Begin by defining Biochemical Oxygen Demand (BOD). It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. Higher BOD indicates higher levels of organic pollution.

2. **Identify Regulatory Body**: Recognize that the Central Pollution Control Board (CPCB) is the regulatory authority in India that sets guidelines and standards for water quality, including permissible BOD levels.

3. **Research BOD Limits**: Look up the specific BOD limits set by the CPCB for the discharge of industrial and municipal waste into natural surface water. This information can typically be found in CPCB publications or guidelines.

4. **State the Limit**: Based on the information gathered, state the specific limit for BOD. As per CPCB guidelines, the permissible limit for BOD in water bodies receiving treated municipal waste is generally around 30 mg/L (milligrams per liter).

5. **Explain the Importance of BOD Limits**: Discuss why these limits are important for maintaining water quality and protecting aquatic life. High BOD levels can lead to oxygen depletion in water bodies, harming fish and other aquatic organisms.

### Final Answer:
The limit of BOD prescribed by the Central Pollution Control Board for the discharge of industrial and municipal waste into natural surface water is generally around 30 mg/L.

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