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 20C 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 30C, 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 20C 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 30C, find the 5-day BOD and ultimate BOD for this higher
temperature.
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