A seeded BOD analysis was conducted on a food-processing wastewater sample. Ten- milliliter portions were used in preparing the 300-ml bottles to determine the dissolved- oxygen demand of the aged, settled wastewater seed. The seeded sample BOD bottles contained 2.7 ml of food-processing wastewater and 1.0 ml of seed wastewater. The results of this series of lest bottles are listed below. Calculate the wastewater BOD values and plot a BOD-time curve. What is the five-day BOD?
Seed Tests | Sample Tests | |||
Time (days) | B1 (mg/l) | B2 (mg/l) | D1 (mg/l) | D2 (mg/l) |
0 | 7.8 | - | 8.1 | - |
1.0 | 7.8 | 6.9 | 8.1 | 5.6 |
2.0 | 7.8 | 6.6 | 8.1 | 4.3 |
3.0 | 7.8 | 6.3 | 8.1 | 3.6 |
4.0 | 7.8 | 5.8 | 8.1 | 3.0 |
5.0 | 7.8 | 5.7 | 8.1 | 2.5 |
6.0 | 7.8 | 5.3 | 8.1 | 2.0 |
7.0 | 7.8 | 5.4 | 8.1 | 1.8 |
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