RESULTS & CALCULATIONBIOCHEMICAL OXYGEN DEMAND ( BOD)

Date: 20/3/14

Time: 9:00 A.M.

Analyst:

From the experiment we can determine the volume of BOD3, for this sample at the end of this experiment

Sample Details:

Source: Waste water (Lake)

pH0C

6.8816.1

Pretreatment:

Alkalinity/Acidity

Sample Volume : -300 mL

I N NaoH : -I N N2SO4: -

Comments: This water sample already neutral with pH value is 6.88

So, the water sample don't have to neutralized

Sample TypeSample IDVolume Sample( mL)

DilutionFactorInitial DO(mg/L)Final DO( mg/L)DO Depletion( mg/L)BOD(mg/L)

Blank

300-6.705.531.17-

BOD3Bottle 23000.00676.805.810.99147.76

BOD3Bottle 43000.01336.815.62

1.1989.47

BOD3Bottle 63000.02006.805.70

1.1055.00

BOD3Bottle 83000.02676.855.66

1.1944.57

BOD3Bottle 103000.03336.845.74

1.133.03

CALCULATION 1) DO Depletion (mg/L)Example: Bottle 2 = Initial DO Final DO = 6.80 -5.81 = 0.99 mg/L

2) Dilution factorExample: Bottle 2 = simple ID /volume sample =2/300 =0.0067

AVERAGE BOD =

Example:

Bottle 2 =

= mg/L

Cancelled Data/ Result: Average BOD = mg/L

= mg/L = 73.97 mg/L