Engineering, 16.04.2020 00:47 sairaanwar67

The following information is available for a seeded 5-day BOD test conducted on a wastewater sample. 15 mL of the waste sample was added directly into a 300-mL BOD incubation bottle and then 285 mL of dilution water was added to fill the bottle. The initial DO of the diluted sample was 8.8 mg/L and the final DO after 5 days was 1.9 mg/L. 1. Assuming that the BOD5 of 285 mL dilution water is 0 mg/L. What is the 5-day BOD (BOD5) of the wastewater sample 2. In reality, the dilution water usually has its own BOD. In a control experiment of determining the BOD5 of dilution water with seed microorganisms, the initial DO of dilution water was 9.1 mg/L and the final DO after 5 days was 7.9 mg/L. What is the 5-day BOD (BOD5) of the wastewater sample

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