A BOD test is conducted using standard size BOD bottles. The technician prepares  two BOD bottles on Day 0, putting 20 mL of wastewater into each bottle and then filling  each bottle the rest of the way with dilution water. A seed is also added. He measures the  dissolved oxygen concentration in the first bottle to be 8.2 mg/L. He places the second bottle  in the 20C incubator. Five days later, he measures the dissolved oxygen concentration in the  second bottle to be 3.4 mg/L. A control bottle (containing dilution water and seed) was also  tested and did not have an oxygen demand. a. What is the 5-day BOD for this waste? b. If the ultimate BOD of this waste is 130 mg/L, what is the BOD rate constant? c. If the test was re-run at 30C, find the 5-day BOD and ultimate BOD for this higher  temperature.

A BOD test is conducted using standard size BOD bottles. The technician prepares 
two BOD bottles on Day 0, putting 20 mL of wastewater into each bottle and then filling 
each bottle the rest of the way with dilution water. A seed is also added. He measures the 
dissolved oxygen concentration in the first bottle to be 8.2 mg/L. He places the second bottle 
in the 20C incubator. Five days later, he measures the dissolved oxygen concentration in the 
second bottle to be 3.4 mg/L. A control bottle (containing dilution water and seed) was also 
tested and did not have an oxygen demand.
a. What is the 5-day BOD for this waste?
b. If the ultimate BOD of this waste is 130 mg/L, what is the BOD rate constant?
c. If the test was re-run at 30C, find the 5-day BOD and ultimate BOD for this higher 
temperature.

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