In order for BOD results to be valid, it is desirable to maintain a minimum dissolved oxygen concentration at the end of the incubation period of at...

In order for BOD results to be valid, it is desirable to maintain a minimum dissolved oxygen concentration at the end of the incubation period of at least 1.0 mg/L. If an industrial wastewater is known to have a COD of 1000 mg/L, recommend a dilution factor for conducting a BOD5 test.