Question

Bosco has developed the following equation:

K = K’ + \(\frac{\nu}{H}\)η

Here, v = average velocity of the river stream, H = average depth of the river, and η = bed activity coefficient of the river.

In this equation:

1. K is the Deoxygenation rate and K’ is the BOD rate
2. K is the BOD rate and K’ is the Deoxygenation rate
3. K is the Deoxygenation rate and K’ is the Re-aeration rate
4. K is the Re-aeration rate and K’ is the Deoxygenation rate
5.

Answer 1

Correct Answer - Option 1 : K is the Deoxygenation rate and K’ is the BOD rate

Concept:

Bosko Equation:

• It is used to determine k_d from k using characteristics of the stream. It is given by:

k_d = k + \(\frac{\nu}{H}\)η      ---(1)

Here,

k_d - Deoxygenation rate constant at 20°C, (day^-1)

k - BOD rate constant determined in the laboratory at 20°C, (day^-1)

H - Average depth of the stream, (m)

v - Average speed of stream, (m/sec)

η - bed activity coefficient

Explanation:

Given,

K = K’ + \(\frac{\nu}{H}\)η       ---(2)

On comparing,

K = k_d = Deoxygenation rate

K' = k = BOD rate