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Biochemical Oxygen Demand

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Biochemical Oxygen Demand is an expression for the quantity of oxygen required for biological degradation of organic matter in a waste water sample. BOD measurement is therefore used as a basis for the detection of biologically degradable organic matter in water. The difference between BOD and chemical oxygen
demand (COD) is that COD additionally registers biologically non-degradable organic matter. BOD measurement is therefore an important measurement of the effects of domestic and industrial waste water on sewage plants and outflow points.
Mano metric, respirometric BOD measurement using the Lovibond ® OxiDirect:
The Lovibond® sensor system OxiDirect is a 6 sample system that allows precise measurements of BOD based on the manometric principle. Manometric respirometers relate oxygen uptake to the change in pressure caused by oxygen consumption while maintaining a constant volume. Thanks to the modern integral pressure sensors, it
is no longer necessary to use mercury for pressure measurements.
Measuring ranges and sample volumes:
The BOD level of a sample depends on the quantity of organic matter present, which can vary considerably.
The Lovibond® BOD measuring system OxiDirect is therefore calibrated for the various sample volumes and the corresponding measuring ranges listed in the table below. The overall measuring range of the system is 0 – 4000 mg/l.
For all measuring ranges, BOD is shown directly in mg/l:

Range mg/ l BOD Sample Volume ml
0 – 40 428
0 – 80 360
0 – 200 244
0 – 400 157
0 – 800 94
0 – 2000 56
0 – 4000 21.7

Evaluation of measurements:
If the measuring period is set at 24 hours, the Lovibond® OxiDirect BOD measuring system records a measurement once every hour. With a measuring period of 48 hours, the unit measures and stores a BOD value once every 2 hours. If the measuring period is between 3 and 28 days, one value is measured and stored each day.
Current values and stored values may be called up at any time. The table/graph below illustrates an example
of BOD5 evaluation.
The development of BOD over a period of 5 days is easily seen:
Day Display
1. Day 150 mg/l
2. Day 220 mg/l
3. Day 240 mg/l
4. Day 250 mg/l
5. Day 260 mg/l


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