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Objective Question & Answer

QUESTION

Objective Question

Q.1

Anaerobically treated effluent has MPN of total coliform per 100 ml as 108. After chlorination, the

MPN value per 100 ml as 104. The log removal of total coliform MPN is

A
12
B
10-12
C
104
D
4
Answer ( Option D)

4

Solution

No = 108      Nt=104

Log(R) = log10 (N0) - log10 (Nt)

= log10(108) - log10(104)

= 8 - 4 = 4

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