Water Resources--Office of Water Quality

...National Field Manual

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7.2 FIVE-DAY BIOCHEMICAL OXYGEN DEMAND

By G.C. Delzer and S.W. McKenzie

7.2 Five-Day Biochemical Oxygen Demand
7.2.1   Equipment and supplies
7.2.2   Sample collection and storage
7.2.3   Five-day test for biochemical oxygen demand
7.2.3.A    Sample preparation
7.2.3.B   Interferences
7.2.3.C   BOD5 test procedure
7.2.4    Calculations
7.2.5   Troubleshooting
7.2.6   Reporting

Illustrations

7.2-1.Biochemical oxygen demand curves: (A) typical carbonaceous-demand curve showing the oxidation of organic matter, and (B) typical carbonaceous- plus nitrogeneous-demand curve showing the oxidation of ammonia and nitrite

7.2-2.Example of a five-day biochemical oxygen demand worksheet

Tables

7.2-1. Equipment, supplies, chemical reagents, and preparation of dilution water and chemical solutions used in the procedure for determination of five-day biochemical oxygen demand

7.2-2. Recommended sample volumes for the five-day biochemical oxygen demand test

7.2-3. Troubleshooting guide for the five-day biochemical oxygen demand test

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