(3) In a BOD test on a diluted wastewater sample (1:14 dilution, but not seeded), the...

 

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(3) In a BOD test on a diluted wastewater sample (1:14 dilution, but not seeded), the initial DO is 8.4 mg/L and final DO after 5 days is 4.2 mg/L. If the reaction rate constant is 0.22/day, calculate: (a) 5-day BOD of the wastewater, (b) Ultimate carbonaceous BOD of the wastewater, (c) Remaining Oxygen demand after 5-days. (4) Calculate the BOD3 at 27°C of a wastewater sample for the following data: Bottle capacity = 300 mL seed control Volume of seed added to the bottle 6 mL Initial DO in bottle containing seed and dilution water = 8.20 mg/L DO in bottle containing seed and dilution water after incubation = 4.80 mg/L %3! sample Volume of seed added to bottle 2 mL Volume of sample added to bottle 30 mL Initial DO in bottle containing seed, sample and dilution water = 8.10 mg/L DO in bottle containing seed, sample and dilution water after incubation = 3.20 mg/L. %3D (3) In a BOD test on a diluted wastewater sample (1:14 dilution, but not seeded), the initial DO is 8.4 mg/L and final DO after 5 days is 4.2 mg/L. If the reaction rate constant is 0.22/day, calculate: (a) 5-day BOD of the wastewater, (b) Ultimate carbonaceous BOD of the wastewater, (c) Remaining Oxygen demand after 5-days. (4) Calculate the BOD3 at 27°C of a wastewater sample for the following data: Bottle capacity = 300 mL seed control Volume of seed added to the bottle 6 mL Initial DO in bottle containing seed and dilution water = 8.20 mg/L DO in bottle containing seed and dilution water after incubation = 4.80 mg/L %3! sample Volume of seed added to bottle 2 mL Volume of sample added to bottle 30 mL Initial DO in bottle containing seed, sample and dilution water = 8.10 mg/L DO in bottle containing seed, sample and dilution water after incubation = 3.20 mg/L. %3D

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