To determine the BOD5 of a waste water sample 10, 50, 75 and 100 ml sa

1.	To determine the BOD5 of a waste water sample 10, 50, 75 and 100 ml samples of the waste water were diluted to 500 ml and incubated at 20∘C in BOD bottles for 5 days. The results were as follows:S.NoWaste water volume, mlInital DO, mg/lDo after 5 days, mg/l1109.86.92508.64.53.758.21.24.1008.00.0Based on the above data, the average BOD5 of the waste water sample is mg/l77.56
Answer» To determine the $B O D_{5}$ of a waste water sample 10, 50, 75 and 100 ml samples of the waste water were diluted to 500 ml and incubated at $20^{\circ} C$ in BOD bottles for 5 days. The results were as follows: $\begin{matrix} S.No & Waste water volume, ml & Inital DO, mg/l & Do after 5 days, mg/l 1 & 10 & 9.8 & 6.9 2 & 50 & 8.6 & 4.5 3. & 75 & 8.2 & 1.2 4. & 100 & 8.0 & 0.0 \end{matrix}$ Based on the above data, the average $B O D_{5}$ of the waste water sample is mg/l 77.56

To determine the BOD5 of a waste water sample 10, 50, 75 and 100 ml samples of the waste water were diluted to 500 ml and incubated at 20∘C in BOD bottles for 5 days. The results were as follows:S.NoWaste water volume, mlInital DO, mg/lDo after 5 days, mg/l1109.86.92508.64.53.758.21.24.1008.00.0Based on the above data, the average BOD5 of the waste water sample is mg/l77.56

Answer»

To determine the $B O D_{5}$ of a waste water sample 10, 50, 75 and 100 ml samples of the waste water were diluted to 500 ml and incubated at $20^{\circ} C$ in BOD bottles for 5 days. The results were as follows:

$\begin{matrix} S.No & Waste water volume, ml & Inital DO, mg/l & Do after 5 days, mg/l 1 & 10 & 9.8 & 6.9 2 & 50 & 8.6 & 4.5 3. & 75 & 8.2 & 1.2 4. & 100 & 8.0 & 0.0 \end{matrix}$

Based on the above data, the average $B O D_{5}$ of the waste water sample is mg/l

77.56

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