A seeded BOD analysis was conducted on a meat processing wastewater. Dissolved oxygen data for the seed test and seeded wastewater follow. The BOD biotics for the seed ( aged, settled, domestic wastewater) were set up by adding 15ml per 300-ml bottle. The test bottles for the meat processing wastewater were set up by adding 2.0ml of wastewater and 1.5ml of seed.
DO Measurements in Bottles | ||
Time (Days) | Seed (mg/I) | Seeded Waste |
0 | 7.9 | 8.1 |
1.0 | 6.5 | 5.5 |
2.2 | 5.4 | 4.2 |
3.0 | 4.9 | 3.7 |
4.0 | 4.0 | 2.5 |
5.0 | 3.8 | 2.1 |
6.0 | 3.8 | 2.1 |
7.0 | 3.6 | 2.0 |
Based on the averages of three tests, the initial DO in the seed bottles was 7.9 mg/l and the initial DO in the wastewater bottles was 8.1 mg/l, Sketch BOD-time curves for both the seed wastewater and meat-processing wastewater. Determine the 5-day BOD values and /orates using the graphical procedure.
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