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Question
Match List-I (Parameter) with List-II (General standard for discharge into the inland surface water in mg/l (max)) and select the correct answer using the codes given below the lists:

       List-I

       List-II

A.  BOD (5 day 20° C)

1.   250

B.   COD

2.   100

C.   Oil and grease

3.   20

D.  Suspended solids

4.   10

 

5.   30
Codes:
A    B    C    D
A.
2    1    4    5
B.
5    4    3    2
C.
2    4    3    5
D.
5    1    4    2
Answer ( Option D)

5    1    4    2

Solution

Tolerance limits for industrial effluent discharged into inland surface water (IS 2490):
1. BOD5 – 30 mg/l
2. COD – 250 mg/l
3. Total suspended solids – 100 mg/l
4. Oil and grease – 10 mg/l
5. pH – 5.5 to 9

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