What is NBOD?

Document ID

Document ID TE6831

Published Date

Published Date 08/24/2020
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Question
What is NBOD?
Summary
What is NBOD?
Answer
Nitrogenous Biochemical Oxygen Demand (NBOD) refers to the difference between Biochemical Oxygen Demand (BOD) and Carbonaceous Biochemical Oxygen Demand (CBOD):

NBOD = BOD - CBOD

According to Standard Methods 5210, microorganisms can facilitate the oxidation of reduced forms of nitrogen. This oxidation, or NBOD, is included in a BOD test result. To eliminate NBOD from the total BOD result, a nitrification inhibitor is added to the sample (the test is then referred to as a CBOD test).

More information BOD and CBOD can be found in the following articles:

What is BOD?

What is CBOD?

Usually CBOD will be lower than BOD, but the reverse can occur (some microbes can consume the nitrification inhibitor, resulting in an increase in oxygen demand in a CBOD test).
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