6. Glossary
Dem ande chimique en oxygène (DCO); chemical oxygen demand (COD)
Quantity of O2 required to oxidize organic and mineral substances (in the presence of a strong oxidant) present in the effluent. It is expressed in mgO2· L–1.
Biochemical oxygen demand (BOD); Demande biochimique en oxygène (DBO)
Quantity of O2 required to biologically oxidize biodegradable organic matter. It is expressed in mgO2· L–1 and is measured at 20°C and in the dark. In France, BOD5 is referred to as the standard 5-day analysis. To be complete, the analysis requires around three weeks at 20°C. This yields the ultimate BOD or DBO21.
Nitric nitrogen (N-NO3); nitrate
Nitrogen due to nitrates (N-NO3 = NO3 × 0.22).
dissimilatory reduction
Reduction of an inorganic...
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