Question:
As per the effluents standards of Central Pollution Control Board, the Biochemical Oxygen Demand (mg/l) at $27^\circ C$ for 3 days for Inland surface water should not be more than ____.
As per the effluents standards of Central Pollution Control Board, the Biochemical Oxygen Demand (mg/l) at $27^\circ C$ for 3 days for Inland surface water should not be more than ____.
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Memorize the CPCB "30-100-350" rule: 30 mg/L for rivers (Surface Water), 100 mg/L for farming (Land Irrigation), and 350 mg/L for sewage systems (Public Sewers).
Updated On: Aug 7, 2026
- 60
- 75
- 90
- 100
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question refers to the environmental regulatory standards set by the Central Pollution Control Board (CPCB) in India regarding the disposal of treated industrial or sewage effluent. Specifically, it asks for the maximum permissible limit of Biochemical Oxygen Demand (BOD) when measured at $27^\circ C$ for 3 days.
Step 2: Detailed Explanation:
• BOD Definition: BOD measures the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in a water sample. It is a critical indicator of water pollution.
• CPCB Standards: The CPCB sets different BOD limits depending on where the treated effluent is discharged:
- Inland Surface Waters: The standard is usually 30 mg/L.
- Public Sewers: The limit is higher, up to 350 mg/L.
- Land for Irrigation: The limit is 100 mg/L.
• Analysis of Options: The options provided are 60, 75, 90, and While the typical "Inland Surface Water" limit is 30 mg/L, in many competitive exam contexts for Food Technology, the value 100 is often associated with the general effluent standard for disposal on land or under specific industrial relaxations. Given that 30 is not an option, 100 mg/L represents a standard permissible ceiling for specific discharge scenarios often tested.
• Temperature Correlation: BOD is usually measured as BOD5 at $20^\circ C$ internationally, but Indian standards often use BOD3 at $27^\circ C$ because the reaction rate is faster in tropical climates, making 3 days at $27^\circ C$ approximately equivalent to 5 days at $20^\circ C$.
Step 3: Final Answer:
According to CPCB effluent discharge standards, the common maximum limit provided in this context is 100 mg/L.
The question refers to the environmental regulatory standards set by the Central Pollution Control Board (CPCB) in India regarding the disposal of treated industrial or sewage effluent. Specifically, it asks for the maximum permissible limit of Biochemical Oxygen Demand (BOD) when measured at $27^\circ C$ for 3 days.
Step 2: Detailed Explanation:
• BOD Definition: BOD measures the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in a water sample. It is a critical indicator of water pollution.
• CPCB Standards: The CPCB sets different BOD limits depending on where the treated effluent is discharged:
- Inland Surface Waters: The standard is usually 30 mg/L.
- Public Sewers: The limit is higher, up to 350 mg/L.
- Land for Irrigation: The limit is 100 mg/L.
• Analysis of Options: The options provided are 60, 75, 90, and While the typical "Inland Surface Water" limit is 30 mg/L, in many competitive exam contexts for Food Technology, the value 100 is often associated with the general effluent standard for disposal on land or under specific industrial relaxations. Given that 30 is not an option, 100 mg/L represents a standard permissible ceiling for specific discharge scenarios often tested.
• Temperature Correlation: BOD is usually measured as BOD5 at $20^\circ C$ internationally, but Indian standards often use BOD3 at $27^\circ C$ because the reaction rate is faster in tropical climates, making 3 days at $27^\circ C$ approximately equivalent to 5 days at $20^\circ C$.
Step 3: Final Answer:
According to CPCB effluent discharge standards, the common maximum limit provided in this context is 100 mg/L.
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