What are the parameters of the BOD test?

The correct parameters for the Biochemical Oxygen Demand (BOD) test are 5 days at 20° Centigrade. This standard is established to measure the amount of dissolved oxygen that microorganisms will consume while decomposing organic matter in water under aerobic conditions over a specified period.

The 5-day duration is particularly important because it allows for a representative measure of the oxygen demand typically exerted by wastewater, reflecting the levels of biodegradable material present. The 20° Centigrade temperature is chosen because it promotes microbial activity without allowing excessive growth or variations that could skew results.

Different test durations or temperatures, such as 3 days or longer periods, might not accurately represent the typical anaerobic conditions or might induce variability in microbial activity leading to inaccurate BOD readings. Therefore, adhering to the standard of 5 days at 20° Centigrade ensures consistency and reliability in BOD testing, making it the accepted method in wastewater analysis.