Table $9-1$: Dissolved Oxygen $($DO$)$ for BOD samples

Table $10-1$: Absorbance Readings for COD Samples

Prepare a table summarizing your results. The table should include your calculated

values

of BOD$5,$ BOD$7,$ and ultimate BOD, average values of two trials and standard deviation.

For the calculation purpose assume $k=\frac{0\mathrm{.}24}{?}$ day. Also, calculate $5-$day carbonaceous BOD

$($CBOD$5)$ and Nitrogenous BOD $($NBOD$5)$ values

Calculate COD and average values using absorbance value using the equation: $($Note:

Deduct the absorbance value of blank from the sample and then find the COD value of

samples using the equation below$)$

$y=0\mathrm{.}0008x$ where $y=$ absorbance$,x=$COD in $m\frac{g}{L}$

Compare values obtained for BOD$7$ and ultimate carbonaceous BOD between the

samples.

Discuss why Primary Effluent sample has higher BOD and COD compare to Secondary

Effluent sample.

Discuss the effects of nitrification inhibitor on the BOD test for both Primary Effluent and

Secondary Effluent samples.

Find out typical BOD and COD values of the Primary Effluent and Secondary Effluent

samples, then compare those to your result. Discuss if your BOD result yielded the

expected values relative to each other or not.

Compare your BOD to COD values for both samples and discuss your results. Discuss

possible and probable sources of error.